diff --git a/core/modules/action/tests/src/Functional/ConfigurationTest.php b/core/modules/action/tests/src/Functional/ConfigurationTest.php
index 2a4a7452e2b..c2f98725820 100644
--- a/core/modules/action/tests/src/Functional/ConfigurationTest.php
+++ b/core/modules/action/tests/src/Functional/ConfigurationTest.php
@@ -83,7 +83,7 @@ class ConfigurationTest extends BrowserTestBase {
     $this->assertSession()->statusCodeEquals(200);
 
     // Make sure that the action was actually deleted.
-    $this->assertRaw(t('The action %action has been deleted.', ['%action' => $new_action_label]), 'Make sure that we get a delete confirmation message.');
+    $this->assertRaw(t('The action %action has been deleted.', ['%action' => $new_action_label]));
     $this->drupalGet('admin/config/system/actions');
     $this->assertSession()->statusCodeEquals(200);
     $this->assertNoText($new_action_label, "Make sure the action label does not appear on the overview page after we've deleted the action.");
diff --git a/core/modules/aggregator/tests/src/Functional/AggregatorTestBase.php b/core/modules/aggregator/tests/src/Functional/AggregatorTestBase.php
index 505ed0093e3..a21f166654e 100644
--- a/core/modules/aggregator/tests/src/Functional/AggregatorTestBase.php
+++ b/core/modules/aggregator/tests/src/Functional/AggregatorTestBase.php
@@ -93,7 +93,7 @@ abstract class AggregatorTestBase extends BrowserTestBase {
    */
   public function deleteFeed(FeedInterface $feed) {
     $this->drupalPostForm('aggregator/sources/' . $feed->id() . '/delete', [], t('Delete'));
-    $this->assertRaw(t('The feed %title has been deleted.', ['%title' => $feed->label()]), 'Feed deleted successfully.');
+    $this->assertRaw(t('The feed %title has been deleted.', ['%title' => $feed->label()]));
   }
 
   /**
@@ -213,7 +213,7 @@ abstract class AggregatorTestBase extends BrowserTestBase {
    */
   public function deleteFeedItems(FeedInterface $feed) {
     $this->drupalPostForm('admin/config/services/aggregator/delete/' . $feed->id(), [], t('Delete items'));
-    $this->assertRaw(t('The news items from %title have been deleted.', ['%title' => $feed->label()]), 'Feed items deleted.');
+    $this->assertRaw(t('The news items from %title have been deleted.', ['%title' => $feed->label()]));
   }
 
   /**
diff --git a/core/modules/aggregator/tests/src/Functional/ImportOpmlTest.php b/core/modules/aggregator/tests/src/Functional/ImportOpmlTest.php
index 9368d31006c..37aafaa8514 100644
--- a/core/modules/aggregator/tests/src/Functional/ImportOpmlTest.php
+++ b/core/modules/aggregator/tests/src/Functional/ImportOpmlTest.php
@@ -62,7 +62,7 @@ class ImportOpmlTest extends AggregatorTestBase {
 
     $edit = [];
     $this->drupalPostForm('admin/config/services/aggregator/add/opml', $edit, t('Import'));
-    $this->assertRaw(t('<em>Either</em> upload a file or enter a URL.'), 'Error if no fields are filled.');
+    $this->assertRaw(t('<em>Either</em> upload a file or enter a URL.'));
 
     $path = $this->getEmptyOpml();
     $edit = [
@@ -70,7 +70,7 @@ class ImportOpmlTest extends AggregatorTestBase {
       'remote' => file_create_url($path),
     ];
     $this->drupalPostForm('admin/config/services/aggregator/add/opml', $edit, t('Import'));
-    $this->assertRaw(t('<em>Either</em> upload a file or enter a URL.'), 'Error if both fields are filled.');
+    $this->assertRaw(t('<em>Either</em> upload a file or enter a URL.'));
 
     $edit = ['remote' => 'invalidUrl://empty'];
     $this->drupalPostForm('admin/config/services/aggregator/add/opml', $edit, t('Import'));
@@ -110,8 +110,10 @@ class ImportOpmlTest extends AggregatorTestBase {
       'refresh'       => '900',
     ];
     $this->drupalPostForm('admin/config/services/aggregator/add/opml', $edit, t('Import'));
-    $this->assertRaw(t('A feed with the URL %url already exists.', ['%url' => $feeds[0]['url[0][value]']]), 'Verifying that a duplicate URL was identified');
-    $this->assertRaw(t('A feed named %title already exists.', ['%title' => $feeds[1]['title[0][value]']]), 'Verifying that a duplicate title was identified');
+    // Verify that a duplicate URL was identified.
+    $this->assertRaw(t('A feed with the URL %url already exists.', ['%url' => $feeds[0]['url[0][value]']]));
+    // Verify that a duplicate title was identified.
+    $this->assertRaw(t('A feed named %title already exists.', ['%title' => $feeds[1]['title[0][value]']]));
 
     $after = $count_query->execute();
     $this->assertEqual($after, 2, 'Verifying that two distinct feeds were added.');
diff --git a/core/modules/ban/tests/src/Functional/IpAddressBlockingTest.php b/core/modules/ban/tests/src/Functional/IpAddressBlockingTest.php
index eaa2b94c50b..04a9b75602f 100644
--- a/core/modules/ban/tests/src/Functional/IpAddressBlockingTest.php
+++ b/core/modules/ban/tests/src/Functional/IpAddressBlockingTest.php
@@ -41,7 +41,7 @@ class IpAddressBlockingTest extends BrowserTestBase {
     $this->drupalPostForm('admin/config/people/ban', $edit, t('Add'));
     $ip = $connection->select('ban_ip', 'bi')->fields('bi', ['iid'])->condition('ip', $edit['ip'])->execute()->fetchField();
     $this->assertNotEmpty($ip, 'IP address found in database.');
-    $this->assertRaw(t('The IP address %ip has been banned.', ['%ip' => $edit['ip']]), 'IP address was banned.');
+    $this->assertRaw(t('The IP address %ip has been banned.', ['%ip' => $edit['ip']]));
 
     // Try to block an IP address that's already blocked.
     $edit = [];
@@ -72,7 +72,7 @@ class IpAddressBlockingTest extends BrowserTestBase {
     $this->drupalPostForm('admin/config/people/ban/' . $submit_ip, [], t('Add'));
     $ip = $connection->select('ban_ip', 'bi')->fields('bi', ['iid'])->condition('ip', $submit_ip)->execute()->fetchField();
     $this->assertNotEmpty($ip, 'IP address found in database');
-    $this->assertRaw(t('The IP address %ip has been banned.', ['%ip' => $submit_ip]), 'IP address was banned.');
+    $this->assertRaw(t('The IP address %ip has been banned.', ['%ip' => $submit_ip]));
 
     // Submit your own IP address. This fails, although it works when testing
     // manually.
diff --git a/core/modules/big_pipe/tests/src/Functional/BigPipeTest.php b/core/modules/big_pipe/tests/src/Functional/BigPipeTest.php
index 574a1557f73..c6ae925bd14 100644
--- a/core/modules/big_pipe/tests/src/Functional/BigPipeTest.php
+++ b/core/modules/big_pipe/tests/src/Functional/BigPipeTest.php
@@ -184,7 +184,7 @@ class BigPipeTest extends BrowserTestBase {
       1 => $cases['html']->bigPipePlaceholderId,
     ]);
 
-    $this->assertRaw('</body>', 'Closing body tag present.');
+    $this->assertRaw('</body>');
 
     // Verifying BigPipe assets are present.
     $this->assertFalse(empty($this->getDrupalSettings()), 'drupalSettings present.');
@@ -213,8 +213,9 @@ class BigPipeTest extends BrowserTestBase {
     // The 'edge_case__html_exception' case throws an exception.
     $this->assertRaw('The website encountered an unexpected error. Please try again later');
     $this->assertRaw('You are not allowed to say llamas are not cool!');
-    $this->assertNoRaw(BigPipe::STOP_SIGNAL, 'BigPipe stop signal absent: error occurred before then.');
-    $this->assertNoRaw('</body>', 'Closing body tag absent: error occurred before then.');
+    // Check that stop signal and closing body tag are absent.
+    $this->assertNoRaw(BigPipe::STOP_SIGNAL);
+    $this->assertNoRaw('</body>');
     // The exception is expected. Do not interpret it as a test failure.
     unlink($this->root . '/' . $this->siteDirectory . '/error.log');
   }
@@ -264,12 +265,12 @@ class BigPipeTest extends BrowserTestBase {
     // Verifying there are no BigPipe placeholders & replacements.
     $this->assertSession()->responseHeaderEquals('BigPipe-Test-Placeholders', '<none>');
     // Verifying BigPipe start/stop signals are absent.
-    $this->assertNoRaw(BigPipe::START_SIGNAL, 'BigPipe start signal absent.');
-    $this->assertNoRaw(BigPipe::STOP_SIGNAL, 'BigPipe stop signal absent.');
+    $this->assertNoRaw(BigPipe::START_SIGNAL);
+    $this->assertNoRaw(BigPipe::STOP_SIGNAL);
 
     // Verifying BigPipe assets are absent.
     $this->assertTrue(!isset($this->getDrupalSettings()['bigPipePlaceholderIds']) && empty($this->getDrupalSettings()['ajaxPageState']), 'BigPipe drupalSettings and BigPipe asset library absent.');
-    $this->assertRaw('</body>', 'Closing body tag present.');
+    $this->assertRaw('</body>');
 
     // Verify that 4xx responses work fine. (4xx responses are handled by
     // subrequests to a route pointing to a controller with the desired output.)
@@ -283,7 +284,7 @@ class BigPipeTest extends BrowserTestBase {
     // The 'edge_case__html_exception' case throws an exception.
     $this->assertRaw('The website encountered an unexpected error. Please try again later');
     $this->assertRaw('You are not allowed to say llamas are not cool!');
-    $this->assertNoRaw('</body>', 'Closing body tag absent: error occurred before then.');
+    $this->assertNoRaw('</body>');
     // The exception is expected. Do not interpret it as a test failure.
     unlink($this->root . '/' . $this->siteDirectory . '/error.log');
   }
@@ -366,7 +367,7 @@ class BigPipeTest extends BrowserTestBase {
     foreach ($expected_big_pipe_placeholders as $big_pipe_placeholder_id => $expected_ajax_response) {
       // Verify expected placeholder.
       $expected_placeholder_html = '<span data-big-pipe-placeholder-id="' . $big_pipe_placeholder_id . '"></span>';
-      $this->assertRaw($expected_placeholder_html, 'BigPipe placeholder for placeholder ID "' . $big_pipe_placeholder_id . '" found.');
+      $this->assertRaw($expected_placeholder_html);
       $pos = strpos($this->getSession()->getPage()->getContent(), $expected_placeholder_html);
       $placeholder_positions[$pos] = $big_pipe_placeholder_id;
       // Verify expected placeholder replacement.
@@ -397,8 +398,8 @@ class BigPipeTest extends BrowserTestBase {
     $this->assertSame(count($expected_big_pipe_placeholders_with_replacements), preg_match_all('/' . preg_quote('<script type="application/vnd.drupal-ajax" data-big-pipe-replacement-for-placeholder-with-id="', '/') . '/', $this->getSession()->getPage()->getContent()));
 
     // Verifying BigPipe start/stop signals.
-    $this->assertRaw(BigPipe::START_SIGNAL, 'BigPipe start signal present.');
-    $this->assertRaw(BigPipe::STOP_SIGNAL, 'BigPipe stop signal present.');
+    $this->assertRaw(BigPipe::START_SIGNAL);
+    $this->assertRaw(BigPipe::STOP_SIGNAL);
     $start_signal_position = strpos($this->getSession()->getPage()->getContent(), BigPipe::START_SIGNAL);
     $stop_signal_position = strpos($this->getSession()->getPage()->getContent(), BigPipe::STOP_SIGNAL);
     $this->assertTrue($start_signal_position < $stop_signal_position, 'BigPipe start signal appears before stop signal.');
@@ -491,7 +492,8 @@ class BigPipeTest extends BrowserTestBase {
     $this->assertTrue(empty(array_diff(['cookies:big_pipe_nojs', 'session.exists'], explode(' ', $headers[0]['X-Drupal-Cache-Contexts'][0]))), 'The first response varies by the "cookies:big_pipe_nojs" and "session.exists" cache contexts.');
     $this->assertEqual('no-store, content="BigPipe/1.0"', $headers[1]['Surrogate-Control'][0], 'The second response has a "Surrogate-Control" header.');
 
-    $this->assertNoRaw('<noscript><meta http-equiv="Refresh" content="0; URL=', 'Once the BigPipe no-JS cookie is set, the <meta> refresh is absent: only one redirect ever happens.');
+    // Check that the <meta> refresh is absent, only one redirect ever happens.
+    $this->assertNoRaw('<noscript><meta http-equiv="Refresh" content="0; URL=');
   }
 
 }
diff --git a/core/modules/block/tests/src/Functional/BlockInvalidRegionTest.php b/core/modules/block/tests/src/Functional/BlockInvalidRegionTest.php
index 0389375b8c4..5a5a09d8e9d 100644
--- a/core/modules/block/tests/src/Functional/BlockInvalidRegionTest.php
+++ b/core/modules/block/tests/src/Functional/BlockInvalidRegionTest.php
@@ -49,11 +49,11 @@ class BlockInvalidRegionTest extends BrowserTestBase {
 
     // Clearing the cache should disable the test block placed in the invalid region.
     $this->drupalPostForm('admin/config/development/performance', [], 'Clear all caches');
-    $this->assertRaw($warning_message, 'Enabled block was in the invalid region and has been disabled.');
+    $this->assertRaw($warning_message);
 
     // Clear the cache to check if the warning message is not triggered.
     $this->drupalPostForm('admin/config/development/performance', [], 'Clear all caches');
-    $this->assertNoRaw($warning_message, 'Disabled block in the invalid region will not trigger the warning.');
+    $this->assertNoRaw($warning_message);
 
     // Place disabled test block in the invalid region of the default theme.
     \Drupal::configFactory()->getEditable('block.block.' . $block->id())->set('region', 'invalid_region')->save();
@@ -61,7 +61,7 @@ class BlockInvalidRegionTest extends BrowserTestBase {
 
     // Clear the cache to check if the warning message is not triggered.
     $this->drupalPostForm('admin/config/development/performance', [], 'Clear all caches');
-    $this->assertNoRaw($warning_message, 'Disabled block in the invalid region will not trigger the warning.');
+    $this->assertNoRaw($warning_message);
   }
 
 }
diff --git a/core/modules/block/tests/src/Functional/BlockTest.php b/core/modules/block/tests/src/Functional/BlockTest.php
index 2aa6fe5438b..a7ab47a4c8a 100644
--- a/core/modules/block/tests/src/Functional/BlockTest.php
+++ b/core/modules/block/tests/src/Functional/BlockTest.php
@@ -63,7 +63,7 @@ class BlockTest extends BlockTestBase {
 
     // Confirm that an empty block is not displayed.
     $this->assertNoText('Powered by Drupal', 'Empty block not displayed.');
-    $this->assertNoRaw('sidebar-first', 'Empty sidebar-first region is not displayed.');
+    $this->assertNoRaw('sidebar-first');
   }
 
   /**
diff --git a/core/modules/block/tests/src/Functional/BlockXssTest.php b/core/modules/block/tests/src/Functional/BlockXssTest.php
index 98b6ea309cf..ed422a9f5af 100644
--- a/core/modules/block/tests/src/Functional/BlockXssTest.php
+++ b/core/modules/block/tests/src/Functional/BlockXssTest.php
@@ -50,7 +50,8 @@ class BlockXssTest extends BrowserTestBase {
 
     \Drupal::state()->set('block_test.content', $this->randomMachineName());
     $this->drupalGet('');
-    $this->assertNoRaw('<script>alert("XSS label");</script>', 'The block title was properly sanitized when rendered.');
+    // Check that the block title was properly sanitized when rendered.
+    $this->assertNoRaw('<script>alert("XSS label");</script>');
 
     $this->drupalLogin($this->drupalCreateUser([
       'administer blocks',
@@ -58,7 +59,9 @@ class BlockXssTest extends BrowserTestBase {
     ]));
     $default_theme = $this->config('system.theme')->get('default');
     $this->drupalGet('admin/structure/block/list/' . $default_theme);
-    $this->assertNoRaw("<script>alert('XSS subject');</script>", 'The block title was properly sanitized in Block Plugin UI Admin page.');
+    // Check that the block title was properly sanitized in Block Plugin UI
+    // Admin page.
+    $this->assertNoRaw("<script>alert('XSS subject');</script>");
   }
 
   /**
@@ -88,7 +91,8 @@ class BlockXssTest extends BrowserTestBase {
 
     $this->drupalGet(Url::fromRoute('block.admin_display'));
     $this->clickLink('Place block');
-    $this->assertNoRaw('&amp;lt;', 'The page does not have double escaped HTML tags.');
+    // Check that the page does not have double escaped HTML tags.
+    $this->assertNoRaw('&amp;lt;');
   }
 
   /**
diff --git a/core/modules/block/tests/src/Functional/Views/DisplayBlockTest.php b/core/modules/block/tests/src/Functional/Views/DisplayBlockTest.php
index f04f35b1aaf..d799899a268 100644
--- a/core/modules/block/tests/src/Functional/Views/DisplayBlockTest.php
+++ b/core/modules/block/tests/src/Functional/Views/DisplayBlockTest.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\Tests\block\Functional\Views;
 
-use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Component\Serialization\Json;
 use Drupal\Component\Utility\Crypt;
 use Drupal\Core\Site\Settings;
@@ -385,8 +384,9 @@ class DisplayBlockTest extends ViewTestBase {
     $cached_id = 'block:block=' . $cached_block->id() . ':langcode=en|entity.view.edit_form:view=test_view_block:location=block&name=test_view_block&display_id=block_1&langcode=en';
     $cached_id_token = Crypt::hmacBase64($cached_id, Settings::getHashSalt() . $this->container->get('private_key')->get());
     // @see \Drupal\contextual\Tests\ContextualDynamicContextTest:assertContextualLinkPlaceHolder()
-    $this->assertRaw('<div' . new Attribute(['data-contextual-id' => $id, 'data-contextual-token' => $id_token]) . '></div>', new FormattableMarkup('Contextual link placeholder with id @id exists.', ['@id' => $id]));
-    $this->assertRaw('<div' . new Attribute(['data-contextual-id' => $cached_id, 'data-contextual-token' => $cached_id_token]) . '></div>', new FormattableMarkup('Contextual link placeholder with id @id exists.', ['@id' => $cached_id]));
+    // Check existence of the contextual link placeholders.
+    $this->assertRaw('<div' . new Attribute(['data-contextual-id' => $id, 'data-contextual-token' => $id_token]) . '></div>');
+    $this->assertRaw('<div' . new Attribute(['data-contextual-id' => $cached_id, 'data-contextual-token' => $cached_id_token]) . '></div>');
 
     // Get server-rendered contextual links.
     // @see \Drupal\contextual\Tests\ContextualDynamicContextTest:renderContextualLinks()
diff --git a/core/modules/block_content/tests/src/Functional/BlockContentCreationTest.php b/core/modules/block_content/tests/src/Functional/BlockContentCreationTest.php
index ad90ed09579..54dc07e3f21 100644
--- a/core/modules/block_content/tests/src/Functional/BlockContentCreationTest.php
+++ b/core/modules/block_content/tests/src/Functional/BlockContentCreationTest.php
@@ -62,7 +62,7 @@ class BlockContentCreationTest extends BlockContentTestBase {
     $this->assertRaw(new FormattableMarkup('@block %name has been created.', [
       '@block' => 'basic',
       '%name' => $edit['info[0][value]'],
-    ]), 'Basic block created.');
+    ]));
 
     // Check that the view mode setting is hidden because only one exists.
     $this->assertNoFieldByXPath('//select[@name="settings[view_mode]"]', NULL, 'View mode setting hidden because only one exists');
@@ -111,7 +111,7 @@ class BlockContentCreationTest extends BlockContentTestBase {
     $this->assertRaw(new FormattableMarkup('@block %name has been created.', [
       '@block' => 'basic',
       '%name' => $edit['info[0][value]'],
-    ]), 'Basic block created.');
+    ]));
 
     // Save our block permanently
     $this->drupalPostForm(NULL, ['region' => 'content'], t('Save block'));
@@ -186,7 +186,7 @@ class BlockContentCreationTest extends BlockContentTestBase {
     $this->assertRaw(new FormattableMarkup('@block %name has been created.', [
       '@block' => 'basic',
       '%name' => $edit['info[0][value]'],
-    ]), 'Basic block created.');
+    ]));
 
     // Check that the block exists in the database.
     $blocks = \Drupal::entityTypeManager()
diff --git a/core/modules/block_content/tests/src/Functional/BlockContentTypeTest.php b/core/modules/block_content/tests/src/Functional/BlockContentTypeTest.php
index 4a4c3738e81..e064f7a85de 100644
--- a/core/modules/block_content/tests/src/Functional/BlockContentTypeTest.php
+++ b/core/modules/block_content/tests/src/Functional/BlockContentTypeTest.php
@@ -112,7 +112,7 @@ class BlockContentTypeTest extends BlockContentTestBase {
 
     // Verify that title and body fields are displayed.
     $this->drupalGet('block/add/basic');
-    $this->assertRaw('Block description', 'Block info field was found.');
+    $this->assertRaw('Block description');
     $this->assertNotEmpty($this->cssSelect('#edit-body-0-value'), 'Body field was found.');
 
     // Change the block type name.
@@ -132,7 +132,7 @@ class BlockContentTypeTest extends BlockContentTestBase {
     \Drupal::service('entity_field.manager')->clearCachedFieldDefinitions();
 
     $this->drupalGet('block/add');
-    $this->assertRaw('Bar', 'New name was displayed.');
+    $this->assertRaw('Bar');
     $this->clickLink('Bar');
     // Verify that the original machine name was used in the URL.
     $this->assertSession()->addressEquals(Url::fromRoute('block_content.add_form', ['block_content_type' => 'basic']));
@@ -163,8 +163,7 @@ class BlockContentTypeTest extends BlockContentTestBase {
     // Attempt to delete the block type, which should not be allowed.
     $this->drupalGet('admin/structure/block/block-content/manage/' . $type->id() . '/delete');
     $this->assertRaw(
-      t('%label is used by 1 custom block on your site. You can not remove this block type until you have removed all of the %label blocks.', ['%label' => $type->label()]),
-      'The block type will not be deleted until all blocks of that type are removed.'
+      t('%label is used by 1 custom block on your site. You can not remove this block type until you have removed all of the %label blocks.', ['%label' => $type->label()])
     );
     $this->assertNoText('This action cannot be undone.', 'The block type deletion confirmation form is not available.');
 
@@ -173,8 +172,7 @@ class BlockContentTypeTest extends BlockContentTestBase {
     // Attempt to delete the block type, which should now be allowed.
     $this->drupalGet('admin/structure/block/block-content/manage/' . $type->id() . '/delete');
     $this->assertRaw(
-      t('Are you sure you want to delete the custom block type %type?', ['%type' => $type->id()]),
-      'The block type is available for deletion.'
+      t('Are you sure you want to delete the custom block type %type?', ['%type' => $type->id()])
     );
     $this->assertText(t('This action cannot be undone.'), 'The custom block type deletion confirmation form is available.');
   }
diff --git a/core/modules/book/tests/src/Functional/BookTest.php b/core/modules/book/tests/src/Functional/BookTest.php
index 9dd34263c10..bbce9eee264 100644
--- a/core/modules/book/tests/src/Functional/BookTest.php
+++ b/core/modules/book/tests/src/Functional/BookTest.php
@@ -231,7 +231,7 @@ class BookTest extends BrowserTestBase {
     // Make sure each part of the book is there.
     foreach ($nodes as $node) {
       $this->assertText($node->label(), 'Node title found in printer friendly version.');
-      $this->assertRaw($node->body->processed, 'Node body found in printer friendly version.');
+      $this->assertRaw($node->body->processed);
     }
 
     // Make sure we can't export an unsupported format.
diff --git a/core/modules/book/tests/src/Functional/BookTestTrait.php b/core/modules/book/tests/src/Functional/BookTestTrait.php
index b52a4c6f0e3..00a9e410432 100644
--- a/core/modules/book/tests/src/Functional/BookTestTrait.php
+++ b/core/modules/book/tests/src/Functional/BookTestTrait.php
@@ -104,14 +104,14 @@ trait BookTestTrait {
       $url = $previous->toUrl();
       $url->setOptions(['attributes' => ['rel' => ['prev'], 'title' => t('Go to previous page')]]);
       $text = new FormattableMarkup('<b>‹</b> @label', ['@label' => $previous->label()]);
-      $this->assertRaw(Link::fromTextAndUrl($text, $url)->toString(), 'Previous page link found.');
+      $this->assertRaw(Link::fromTextAndUrl($text, $url)->toString());
     }
 
     if ($up) {
       /** @var \Drupal\Core\Url $url */
       $url = $up->toUrl();
       $url->setOptions(['attributes' => ['title' => t('Go to parent page')]]);
-      $this->assertRaw(Link::fromTextAndUrl('Up', $url)->toString(), 'Up page link found.');
+      $this->assertRaw(Link::fromTextAndUrl('Up', $url)->toString());
     }
 
     if ($next) {
@@ -119,7 +119,7 @@ trait BookTestTrait {
       $url = $next->toUrl();
       $url->setOptions(['attributes' => ['rel' => ['next'], 'title' => t('Go to next page')]]);
       $text = new FormattableMarkup('@label <b>›</b>', ['@label' => $next->label()]);
-      $this->assertRaw(Link::fromTextAndUrl($text, $url)->toString(), 'Next page link found.');
+      $this->assertRaw(Link::fromTextAndUrl($text, $url)->toString());
     }
 
     // Compute the expected breadcrumb.
@@ -142,7 +142,7 @@ trait BookTestTrait {
     // Check printer friendly version.
     $this->drupalGet('book/export/html/' . $node->id());
     $this->assertText($node->label(), 'Printer friendly title found.');
-    $this->assertRaw($node->body->processed, 'Printer friendly body found.');
+    $this->assertRaw($node->body->processed);
 
     $number++;
   }
diff --git a/core/modules/ckeditor/tests/src/Functional/CKEditorLoadingTest.php b/core/modules/ckeditor/tests/src/Functional/CKEditorLoadingTest.php
index 89baa22bcb5..4b8436d3dde 100644
--- a/core/modules/ckeditor/tests/src/Functional/CKEditorLoadingTest.php
+++ b/core/modules/ckeditor/tests/src/Functional/CKEditorLoadingTest.php
@@ -100,11 +100,12 @@ class CKEditorLoadingTest extends BrowserTestBase {
     $this->assertCount(0, $format_selector, 'No text format selector exists on the page.');
     $hidden_input = $this->xpath('//input[@type="hidden" and contains(@class, "editor")]');
     $this->assertCount(0, $hidden_input, 'A single text format hidden input does not exist on the page.');
-    $this->assertNoRaw(drupal_get_path('module', 'ckeditor') . '/js/ckeditor.js', 'CKEditor glue JS is absent.');
+    // Verify that CKEditor glue JS is absent.
+    $this->assertNoRaw(drupal_get_path('module', 'ckeditor') . '/js/ckeditor.js');
 
     // On pages where there would never be a text editor, CKEditor JS is absent.
     $this->drupalGet('user');
-    $this->assertNoRaw(drupal_get_path('module', 'ckeditor') . '/js/ckeditor.js', 'CKEditor glue JS is absent.');
+    $this->assertNoRaw(drupal_get_path('module', 'ckeditor') . '/js/ckeditor.js');
 
     // The normal user:
     // - has access to 2 text formats;
diff --git a/core/modules/color/tests/src/Functional/ColorTest.php b/core/modules/color/tests/src/Functional/ColorTest.php
index f0532c65e55..57f8ba73a8a 100644
--- a/core/modules/color/tests/src/Functional/ColorTest.php
+++ b/core/modules/color/tests/src/Functional/ColorTest.php
@@ -208,8 +208,10 @@ class ColorTest extends BrowserTestBase {
     $this->drupalPlaceBlock('system_branding_block', ['region' => 'header']);
 
     $this->drupalGet('');
-    $this->assertNoRaw('files/color/bartik-', 'Make sure the color logo is not being used.');
-    $this->assertRaw('bartik/logo.svg', 'Make sure the original bartik logo exists.');
+    // Make sure the color logo is not being used.
+    $this->assertNoRaw('files/color/bartik-');
+    // Make sure the original bartik logo exists.
+    $this->assertRaw('bartik/logo.svg');
 
     // Log in and set the color scheme to 'slate'.
     $this->drupalLogin($this->bigUser);
@@ -219,8 +221,10 @@ class ColorTest extends BrowserTestBase {
     // Visit the homepage and ensure color changes.
     $this->drupalLogout();
     $this->drupalGet('');
-    $this->assertRaw('files/color/bartik-', 'Make sure the color logo is being used.');
-    $this->assertNoRaw('bartik/logo.svg', 'Make sure the original bartik logo does not exist.');
+    // Make sure the color logo is being used.
+    $this->assertRaw('files/color/bartik-');
+    // Make sure the original bartik logo does not exist.
+    $this->assertNoRaw('bartik/logo.svg');
 
     // Log in and set the color scheme back to default (delete config).
     $this->drupalLogin($this->bigUser);
@@ -230,8 +234,10 @@ class ColorTest extends BrowserTestBase {
     // Log out and ensure there is no color and we have the original logo.
     $this->drupalLogout();
     $this->drupalGet('');
-    $this->assertNoRaw('files/color/bartik-', 'Make sure the color logo is not being used.');
-    $this->assertRaw('bartik/logo.svg', 'Make sure the original bartik logo exists.');
+    // Make sure the color logo is not being used.
+    $this->assertNoRaw('files/color/bartik-');
+    // Make sure the original bartik logo exists.
+    $this->assertRaw('bartik/logo.svg');
   }
 
 }
diff --git a/core/modules/comment/tests/src/Functional/CommentAnonymousTest.php b/core/modules/comment/tests/src/Functional/CommentAnonymousTest.php
index 8b1a7e46d3e..009c5c3b129 100644
--- a/core/modules/comment/tests/src/Functional/CommentAnonymousTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentAnonymousTest.php
@@ -137,27 +137,27 @@ class CommentAnonymousTest extends CommentTestBase {
     // Make sure the user data appears correctly when editing the comment.
     $this->drupalLogin($this->adminUser);
     $this->drupalGet('comment/' . $anonymous_comment3->id() . '/edit');
-    $this->assertRaw($author_name, "The anonymous user's name is correct when editing the comment.");
+    $this->assertRaw($author_name);
     $this->assertFieldByName('uid', '', 'The author field is empty (i.e. anonymous) when editing the comment.');
-    $this->assertRaw($author_mail, "The anonymous user's email address is correct when editing the comment.");
+    $this->assertRaw($author_mail);
 
     // Unpublish comment.
     $this->performCommentOperation($anonymous_comment3, 'unpublish');
 
     $this->drupalGet('admin/content/comment/approval');
-    $this->assertRaw('comments[' . $anonymous_comment3->id() . ']', 'Comment was unpublished.');
+    $this->assertRaw('comments[' . $anonymous_comment3->id() . ']');
 
     // Publish comment.
     $this->performCommentOperation($anonymous_comment3, 'publish', TRUE);
 
     $this->drupalGet('admin/content/comment');
-    $this->assertRaw('comments[' . $anonymous_comment3->id() . ']', 'Comment was published.');
+    $this->assertRaw('comments[' . $anonymous_comment3->id() . ']');
 
     // Delete comment.
     $this->performCommentOperation($anonymous_comment3, 'delete');
 
     $this->drupalGet('admin/content/comment');
-    $this->assertNoRaw('comments[' . $anonymous_comment3->id() . ']', 'Comment was deleted.');
+    $this->assertNoRaw('comments[' . $anonymous_comment3->id() . ']');
     $this->drupalLogout();
 
     // Comment 3 was deleted.
diff --git a/core/modules/comment/tests/src/Functional/CommentBlockTest.php b/core/modules/comment/tests/src/Functional/CommentBlockTest.php
index e5b7852a358..ee6c3fc2390 100644
--- a/core/modules/comment/tests/src/Functional/CommentBlockTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentBlockTest.php
@@ -88,7 +88,7 @@ class CommentBlockTest extends CommentTestBase {
     for ($i = 0; $i < 10; $i++) {
       $this->clickLink($comments[$i]->getSubject());
       $this->assertText($comments[$i]->getSubject(), 'Comment link goes to correct page.');
-      $this->assertRaw('<link rel="canonical"', 'Canonical URL was found in the HTML head');
+      $this->assertRaw('<link rel="canonical"');
     }
   }
 
diff --git a/core/modules/comment/tests/src/Functional/CommentCSSTest.php b/core/modules/comment/tests/src/Functional/CommentCSSTest.php
index a4a929132cd..bff7bed185e 100644
--- a/core/modules/comment/tests/src/Functional/CommentCSSTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentCSSTest.php
@@ -115,7 +115,7 @@ class CommentCSSTest extends CommentTestBase {
         // user (the viewer) was the author of the comment. We do this in Java-
         // Script to prevent breaking the render cache.
         $this->assertCount(1, $this->xpath('//*[contains(@class, "comment") and @data-comment-user-id="' . $case['comment_uid'] . '"]'), 'data-comment-user-id attribute is set on comment.');
-        $this->assertRaw(drupal_get_path('module', 'comment') . '/js/comment-by-viewer.js', 'drupal.comment-by-viewer library is present.');
+        $this->assertRaw(drupal_get_path('module', 'comment') . '/js/comment-by-viewer.js');
       }
 
       // Verify the unpublished class.
diff --git a/core/modules/comment/tests/src/Functional/CommentNonNodeTest.php b/core/modules/comment/tests/src/Functional/CommentNonNodeTest.php
index 62cc571b715..f0f2492d8c2 100644
--- a/core/modules/comment/tests/src/Functional/CommentNonNodeTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentNonNodeTest.php
@@ -238,7 +238,7 @@ class CommentNonNodeTest extends BrowserTestBase {
 
     if ($operation == 'delete') {
       $this->drupalPostForm(NULL, [], t('Delete'));
-      $this->assertRaw(\Drupal::translation()->formatPlural(1, 'Deleted 1 comment.', 'Deleted @count comments.'), new FormattableMarkup('Operation "@operation" was performed on comment.', ['@operation' => $operation]));
+      $this->assertRaw(\Drupal::translation()->formatPlural(1, 'Deleted 1 comment.', 'Deleted @count comments.'));
     }
     else {
       $this->assertText(t('The update has been performed.'), new FormattableMarkup('Operation "@operation" was performed on comment.', ['@operation' => $operation]));
@@ -313,17 +313,17 @@ class CommentNonNodeTest extends BrowserTestBase {
     // Unpublish the comment.
     $this->performCommentOperation($comment1, 'unpublish');
     $this->drupalGet('admin/content/comment/approval');
-    $this->assertRaw('comments[' . $comment1->id() . ']', 'Comment was unpublished.');
+    $this->assertRaw('comments[' . $comment1->id() . ']');
 
     // Publish the comment.
     $this->performCommentOperation($comment1, 'publish', TRUE);
     $this->drupalGet('admin/content/comment');
-    $this->assertRaw('comments[' . $comment1->id() . ']', 'Comment was published.');
+    $this->assertRaw('comments[' . $comment1->id() . ']');
 
     // Delete the comment.
     $this->performCommentOperation($comment1, 'delete');
     $this->drupalGet('admin/content/comment');
-    $this->assertNoRaw('comments[' . $comment1->id() . ']', 'Comment was deleted.');
+    $this->assertNoRaw('comments[' . $comment1->id() . ']');
 
     // Post another comment.
     $comment1 = $this->postComment($this->entity, $this->randomMachineName(), $this->randomMachineName());
@@ -331,7 +331,7 @@ class CommentNonNodeTest extends BrowserTestBase {
 
     // Check that the comment was found.
     $this->drupalGet('admin/content/comment');
-    $this->assertRaw('comments[' . $comment1->id() . ']', 'Comment was published.');
+    $this->assertRaw('comments[' . $comment1->id() . ']');
 
     // Check that entity access applies to administrative page.
     $this->assertText($this->entity->label(), 'Name of commented account found.');
diff --git a/core/modules/comment/tests/src/Functional/CommentPagerTest.php b/core/modules/comment/tests/src/Functional/CommentPagerTest.php
index 3e4c7a0b21c..7a8406fd216 100644
--- a/core/modules/comment/tests/src/Functional/CommentPagerTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentPagerTest.php
@@ -45,7 +45,7 @@ class CommentPagerTest extends CommentTestBase {
     // Check the first page of the node, and confirm the correct comments are
     // shown.
     $this->drupalGet('node/' . $node->id());
-    $this->assertRaw(t('next'), 'Paging links found.');
+    $this->assertRaw(t('next'));
     $this->assertTrue($this->commentExists($comments[0]), 'Comment 1 appears on page 1.');
     $this->assertFalse($this->commentExists($comments[1]), 'Comment 2 does not appear on page 1.');
     $this->assertFalse($this->commentExists($comments[2]), 'Comment 3 does not appear on page 1.');
@@ -380,7 +380,7 @@ class CommentPagerTest extends CommentTestBase {
     // Check the first page of the node, and confirm the correct comments are
     // shown.
     $this->drupalGet('node/' . $node->id());
-    $this->assertRaw(t('next'), 'Paging links found.');
+    $this->assertRaw(t('next'));
     $this->assertRaw('Comment 1 on field comment');
     $this->assertRaw('Comment 1 on field comment_2');
     // Navigate to next page of field 1.
diff --git a/core/modules/comment/tests/src/Functional/CommentRssTest.php b/core/modules/comment/tests/src/Functional/CommentRssTest.php
index b05bfc2c7dd..0ea4351205a 100644
--- a/core/modules/comment/tests/src/Functional/CommentRssTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentRssTest.php
@@ -72,13 +72,13 @@ class CommentRssTest extends CommentTestBase {
     ]));
 
     $raw = '<comments>' . $this->node->toUrl('canonical', ['fragment' => 'comments', 'absolute' => TRUE])->toString() . '</comments>';
-    $this->assertRaw($raw, 'Comments as part of RSS feed.');
+    $this->assertRaw($raw);
 
     // Hide comments from RSS feed and check presence.
     $this->node->set('comment', CommentItemInterface::HIDDEN);
     $this->node->save();
     $this->drupalGet('rss.xml');
-    $this->assertNoRaw($raw, 'Hidden comments is not a part of RSS feed.');
+    $this->assertNoRaw($raw);
   }
 
 }
diff --git a/core/modules/comment/tests/src/Functional/CommentTestBase.php b/core/modules/comment/tests/src/Functional/CommentTestBase.php
index abdae813e0e..eef34adaf6a 100644
--- a/core/modules/comment/tests/src/Functional/CommentTestBase.php
+++ b/core/modules/comment/tests/src/Functional/CommentTestBase.php
@@ -364,7 +364,7 @@ abstract class CommentTestBase extends BrowserTestBase {
 
     if ($operation == 'delete') {
       $this->drupalPostForm(NULL, [], t('Delete'));
-      $this->assertRaw(\Drupal::translation()->formatPlural(1, 'Deleted 1 comment.', 'Deleted @count comments.'), new FormattableMarkup('Operation "@operation" was performed on comment.', ['@operation' => $operation]));
+      $this->assertRaw(\Drupal::translation()->formatPlural(1, 'Deleted 1 comment.', 'Deleted @count comments.'));
     }
     else {
       $this->assertText(t('The update has been performed.'), new FormattableMarkup('Operation "@operation" was performed on comment.', ['@operation' => $operation]));
diff --git a/core/modules/comment/tests/src/Functional/CommentTypeTest.php b/core/modules/comment/tests/src/Functional/CommentTypeTest.php
index 47a26131511..25926d18dc9 100644
--- a/core/modules/comment/tests/src/Functional/CommentTypeTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentTypeTest.php
@@ -112,7 +112,7 @@ class CommentTypeTest extends CommentTestBase {
     $this->drupalPostForm('admin/structure/comment/manage/comment', $edit, t('Save'));
 
     $this->drupalGet('admin/structure/comment');
-    $this->assertRaw('Bar', 'New name was displayed.');
+    $this->assertRaw('Bar');
     $this->clickLink('Manage fields');
     // Verify that the original machine name was used in the URL.
     $this->assertSession()->addressEquals(Url::fromRoute('entity.comment.field_ui_fields', ['comment_type' => 'comment']));
@@ -158,15 +158,13 @@ class CommentTypeTest extends CommentTestBase {
     // Attempt to delete the comment type, which should not be allowed.
     $this->drupalGet('admin/structure/comment/manage/' . $type->id() . '/delete');
     $this->assertRaw(
-      t('%label is used by 1 comment on your site. You can not remove this comment type until you have removed all of the %label comments.', ['%label' => $type->label()]),
-      'The comment type will not be deleted until all comments of that type are removed.'
+      t('%label is used by 1 comment on your site. You can not remove this comment type until you have removed all of the %label comments.', ['%label' => $type->label()])
     );
     $this->assertRaw(
       t('%label is used by the %field field on your site. You can not remove this comment type until you have removed the field.', [
         '%label' => 'foo',
         '%field' => 'node.foo',
-      ]),
-      'The comment type will not be deleted until all fields of that type are removed.'
+      ])
     );
     $this->assertNoText('This action cannot be undone.', 'The comment type deletion confirmation form is not available.');
 
@@ -176,8 +174,7 @@ class CommentTypeTest extends CommentTestBase {
     // Attempt to delete the comment type, which should now be allowed.
     $this->drupalGet('admin/structure/comment/manage/' . $type->id() . '/delete');
     $this->assertRaw(
-      t('Are you sure you want to delete the comment type %type?', ['%type' => $type->id()]),
-      'The comment type is available for deletion.'
+      t('Are you sure you want to delete the comment type %type?', ['%type' => $type->id()])
     );
     $this->assertText(t('This action cannot be undone.'), 'The comment type deletion confirmation form is available.');
 
diff --git a/core/modules/config/tests/src/Functional/ConfigEntityListTest.php b/core/modules/config/tests/src/Functional/ConfigEntityListTest.php
index c49118341bd..95358c8e6af 100644
--- a/core/modules/config/tests/src/Functional/ConfigEntityListTest.php
+++ b/core/modules/config/tests/src/Functional/ConfigEntityListTest.php
@@ -277,14 +277,14 @@ class ConfigEntityListTest extends BrowserTestBase {
     $this->drupalGet('admin/structure/config_test');
 
     // Item 51 should not be present.
-    $this->assertRaw('Test config entity 50', 'Config entity 50 is shown.');
-    $this->assertNoRaw('Test config entity 51', 'Config entity 51 is on the next page.');
+    $this->assertRaw('Test config entity 50');
+    $this->assertNoRaw('Test config entity 51');
 
-    // Browse to the next page.
+    // Browse to the next page, test config entity 51 is on page 2.
     $this->clickLink(t('Page 2'));
-    $this->assertNoRaw('Test config entity 50', 'Test config entity 50 is on the previous page.');
-    $this->assertRaw('dotted.default', 'Default config entity appears on page 2.');
-    $this->assertRaw('Test config entity 51', 'Test config entity 51 is on page 2.');
+    $this->assertNoRaw('Test config entity 50');
+    $this->assertRaw('dotted.default');
+    $this->assertRaw('Test config entity 51');
   }
 
 }
diff --git a/core/modules/config/tests/src/Functional/ConfigExportUITest.php b/core/modules/config/tests/src/Functional/ConfigExportUITest.php
index e822e378cb9..06f2c6f2d41 100644
--- a/core/modules/config/tests/src/Functional/ConfigExportUITest.php
+++ b/core/modules/config/tests/src/Functional/ConfigExportUITest.php
@@ -89,7 +89,7 @@ class ConfigExportUITest extends BrowserTestBase {
 
     // Check the single export form doesn't have "form-required" elements.
     $this->drupalGet('admin/config/development/configuration/single/export');
-    $this->assertNoRaw('js-form-required form-required', 'No form required fields are found.');
+    $this->assertNoRaw('js-form-required form-required');
 
     // Ensure the temporary file is not available to users without the
     // permission.
diff --git a/core/modules/contact/tests/src/Functional/ContactPersonalTest.php b/core/modules/contact/tests/src/Functional/ContactPersonalTest.php
index 291f7c952f5..f62b2286ee2 100644
--- a/core/modules/contact/tests/src/Functional/ContactPersonalTest.php
+++ b/core/modules/contact/tests/src/Functional/ContactPersonalTest.php
@@ -255,7 +255,8 @@ class ContactPersonalTest extends BrowserTestBase {
 
     // Submit contact form one over limit.
     $this->submitPersonalContact($this->contactUser);
-    $this->assertRaw(t('You cannot send more than %number messages in @interval. Try again later.', ['%number' => $flood_limit, '@interval' => \Drupal::service('date.formatter')->formatInterval($this->config('contact.settings')->get('flood.interval'))]), 'Normal user denied access to flooded contact form.');
+    // Normal user should be denied access to flooded contact form.
+    $this->assertRaw(t('You cannot send more than %number messages in @interval. Try again later.', ['%number' => $flood_limit, '@interval' => \Drupal::service('date.formatter')->formatInterval($this->config('contact.settings')->get('flood.interval'))]));
 
     // Test that the admin user can still access the contact form even though
     // the flood limit was reached.
diff --git a/core/modules/content_translation/tests/src/Functional/ContentTranslationContextualLinksTest.php b/core/modules/content_translation/tests/src/Functional/ContentTranslationContextualLinksTest.php
index b958fa1af64..51058b89ee4 100644
--- a/core/modules/content_translation/tests/src/Functional/ContentTranslationContextualLinksTest.php
+++ b/core/modules/content_translation/tests/src/Functional/ContentTranslationContextualLinksTest.php
@@ -127,7 +127,7 @@ class ContentTranslationContextualLinksTest extends BrowserTestBase {
     $this->drupalLogin($this->translator);
     $translate_link = 'node/' . $node->id() . '/translations';
     $this->drupalGet($translate_link);
-    $this->assertRaw(t('Translations of %label', ['%label' => $node->label()]), 'The contextual link leads to the translate page.');
+    $this->assertRaw(t('Translations of %label', ['%label' => $node->label()]));
   }
 
 }
diff --git a/core/modules/dblog/tests/src/Functional/DbLogTest.php b/core/modules/dblog/tests/src/Functional/DbLogTest.php
index 33eec9c62b3..7e3a511f713 100644
--- a/core/modules/dblog/tests/src/Functional/DbLogTest.php
+++ b/core/modules/dblog/tests/src/Functional/DbLogTest.php
@@ -133,10 +133,10 @@ class DbLogTest extends BrowserTestBase {
     $this->assertSession()->linkByHrefExists($context['referer']);
 
     // Verify hostname.
-    $this->assertRaw($context['ip'], 'Found hostname on the detail page.');
+    $this->assertRaw($context['ip']);
 
     // Verify location.
-    $this->assertRaw($context['request_uri'], 'Found location on the detail page.');
+    $this->assertRaw($context['request_uri']);
 
     // Verify severity.
     $this->assertText('Notice', 'The severity was properly displayed on the detail page.');
@@ -471,7 +471,7 @@ class DbLogTest extends BrowserTestBase {
       $link = mb_substr($value, strpos($value, 'admin/reports/dblog/event/'));
       $this->drupalGet($link);
       // Check for full message text on the details page.
-      $this->assertRaw($message, 'DBLog event details was found: [delete user]');
+      $this->assertRaw($message);
     }
     $this->assertNotEmpty($link, 'DBLog event was recorded: [delete user]');
     // Visit random URL (to generate page not found event).
diff --git a/core/modules/editor/tests/src/Functional/EditorAdminTest.php b/core/modules/editor/tests/src/Functional/EditorAdminTest.php
index e2ffd5ecfb6..25eacaf3feb 100644
--- a/core/modules/editor/tests/src/Functional/EditorAdminTest.php
+++ b/core/modules/editor/tests/src/Functional/EditorAdminTest.php
@@ -72,7 +72,7 @@ class EditorAdminTest extends BrowserTestBase {
     $this->assertCount(1, $select_is_disabled, 'The Text Editor select is disabled.');
     $this->assertCount(1, $options, 'The Text Editor select has only one option.');
     $this->assertTrue(($options[0]->getText()) === 'None', 'Option 1 in the Text Editor select is "None".');
-    $this->assertRaw('This option is disabled because no modules that provide a text editor are currently enabled.', 'Description for select present that tells users to install a text editor module.');
+    $this->assertRaw('This option is disabled because no modules that provide a text editor are currently enabled.');
   }
 
   /**
@@ -203,7 +203,7 @@ class EditorAdminTest extends BrowserTestBase {
     $this->assertTrue(($options[1]->getText()) === 'Unicorn Editor', 'Option 2 in the Text Editor select is "Unicorn Editor".');
     $this->assertTrue($options[0]->hasAttribute('selected'), 'Option 1 ("None") is selected.');
     // Ensure the none option is selected.
-    $this->assertNoRaw('This option is disabled because no modules that provide a text editor are currently enabled.', 'Description for select absent that tells users to install a text editor module.');
+    $this->assertNoRaw('This option is disabled because no modules that provide a text editor are currently enabled.');
 
     // Select the "Unicorn Editor" editor and click the "Configure" button.
     $edit = [
diff --git a/core/modules/field/tests/src/Functional/Boolean/BooleanFieldTest.php b/core/modules/field/tests/src/Functional/Boolean/BooleanFieldTest.php
index b34504e955d..534cfa5b7b0 100644
--- a/core/modules/field/tests/src/Functional/Boolean/BooleanFieldTest.php
+++ b/core/modules/field/tests/src/Functional/Boolean/BooleanFieldTest.php
@@ -108,7 +108,7 @@ class BooleanFieldTest extends BrowserTestBase {
     $this->drupalGet('entity_test/add');
     $this->assertFieldByName("{$field_name}[value]", '', 'Widget found.');
     $this->assertText($this->field->label(), 'Uses field label by default.');
-    $this->assertNoRaw($on, 'Does not use the "On" label.');
+    $this->assertNoRaw($on);
 
     // Submit and ensure it is accepted.
     $edit = [
diff --git a/core/modules/field/tests/src/Functional/EntityReference/EntityReferenceFieldDefaultValueTest.php b/core/modules/field/tests/src/Functional/EntityReference/EntityReferenceFieldDefaultValueTest.php
index 0457ba614be..f775b61a040 100644
--- a/core/modules/field/tests/src/Functional/EntityReference/EntityReferenceFieldDefaultValueTest.php
+++ b/core/modules/field/tests/src/Functional/EntityReference/EntityReferenceFieldDefaultValueTest.php
@@ -90,7 +90,7 @@ class EntityReferenceFieldDefaultValueTest extends BrowserTestBase {
 
     // Check that default value is selected in default value form.
     $this->drupalGet('admin/structure/types/manage/reference_content/fields/node.reference_content.' . $field_name);
-    $this->assertRaw('name="default_value_input[' . $field_name . '][0][target_id]" value="' . $referenced_node->getTitle() . ' (' . $referenced_node->id() . ')', 'The default value is selected in instance settings page');
+    $this->assertRaw('name="default_value_input[' . $field_name . '][0][target_id]" value="' . $referenced_node->getTitle() . ' (' . $referenced_node->id() . ')');
 
     // Check if the ID has been converted to UUID in config entity.
     $config_entity = $this->config('field.field.node.reference_content.' . $field_name)->get();
diff --git a/core/modules/field/tests/src/Functional/FormTest.php b/core/modules/field/tests/src/Functional/FormTest.php
index e0cbc00272a..27f18a0b7b5 100644
--- a/core/modules/field/tests/src/Functional/FormTest.php
+++ b/core/modules/field/tests/src/Functional/FormTest.php
@@ -138,7 +138,7 @@ class FormTest extends FieldTestBase {
       "{$field_name}[0][value]" => -1,
     ];
     $this->drupalPostForm(NULL, $edit, t('Save'));
-    $this->assertRaw(t('%name does not accept the value -1.', ['%name' => $this->field['label']]), 'Field validation fails with invalid input.');
+    $this->assertRaw(t('%name does not accept the value -1.', ['%name' => $this->field['label']]));
     // TODO : check that the correct field is flagged for error.
 
     // Create an entity
@@ -230,7 +230,7 @@ class FormTest extends FieldTestBase {
     // Submit with missing required value.
     $edit = [];
     $this->drupalPostForm('entity_test/add', $edit, t('Save'));
-    $this->assertRaw(t('@name field is required.', ['@name' => $this->field['label']]), 'Required field with no value fails validation');
+    $this->assertRaw(t('@name field is required.', ['@name' => $this->field['label']]));
 
     // Create an entity
     $value = mt_rand(1, 127);
@@ -250,7 +250,7 @@ class FormTest extends FieldTestBase {
       "{$field_name}[0][value]" => $value,
     ];
     $this->drupalPostForm('entity_test/manage/' . $id . '/edit', $edit, t('Save'));
-    $this->assertRaw(t('@name field is required.', ['@name' => $this->field['label']]), 'Required field with no value fails validation');
+    $this->assertRaw(t('@name field is required.', ['@name' => $this->field['label']]));
   }
 
   public function testFieldFormUnlimited() {
@@ -462,7 +462,7 @@ class FormTest extends FieldTestBase {
     // Submit the form with more values than the field accepts.
     $edit = [$field_name => '1, 2, 3, 4, 5'];
     $this->drupalPostForm(NULL, $edit, t('Save'));
-    $this->assertRaw('this field cannot hold more than 4 values', 'Form validation failed.');
+    $this->assertRaw('this field cannot hold more than 4 values');
     // Check that the field values were not submitted.
     $this->assertFieldValues($entity_init, $field_name, [1, 2, 3]);
 
diff --git a/core/modules/field/tests/src/Functional/NestedFormTest.php b/core/modules/field/tests/src/Functional/NestedFormTest.php
index cbf3e2844ab..311b089953e 100644
--- a/core/modules/field/tests/src/Functional/NestedFormTest.php
+++ b/core/modules/field/tests/src/Functional/NestedFormTest.php
@@ -128,14 +128,14 @@ class NestedFormTest extends FieldTestBase {
       'field_unlimited[1][value]' => -1,
     ];
     $this->drupalPostForm('test-entity/nested/1/2', $edit, t('Save'));
-    $this->assertRaw(t('%label does not accept the value -1', ['%label' => 'Unlimited field']), 'Entity 1: the field validation error was reported.');
+    $this->assertRaw(t('%label does not accept the value -1', ['%label' => 'Unlimited field']));
     $error_field = $this->xpath('//input[@id=:id and contains(@class, "error")]', [':id' => 'edit-field-unlimited-1-value']);
     $this->assertCount(1, $error_field, 'Entity 1: the error was flagged on the correct element.');
     $edit = [
       'entity_2[field_unlimited][1][value]' => -1,
     ];
     $this->drupalPostForm('test-entity/nested/1/2', $edit, t('Save'));
-    $this->assertRaw(t('%label does not accept the value -1', ['%label' => 'Unlimited field']), 'Entity 2: the field validation error was reported.');
+    $this->assertRaw(t('%label does not accept the value -1', ['%label' => 'Unlimited field']));
     $error_field = $this->xpath('//input[@id=:id and contains(@class, "error")]', [':id' => 'edit-entity-2-field-unlimited-1-value']);
     $this->assertCount(1, $error_field, 'Entity 2: the error was flagged on the correct element.');
 
diff --git a/core/modules/field/tests/src/Functional/Number/NumberFieldTest.php b/core/modules/field/tests/src/Functional/Number/NumberFieldTest.php
index e4e9358c716..69a7255de17 100644
--- a/core/modules/field/tests/src/Functional/Number/NumberFieldTest.php
+++ b/core/modules/field/tests/src/Functional/Number/NumberFieldTest.php
@@ -87,7 +87,7 @@ class NumberFieldTest extends BrowserTestBase {
     preg_match('|entity_test/manage/(\d+)|', $this->getUrl(), $match);
     $id = $match[1];
     $this->assertText(t('entity_test @id has been created.', ['@id' => $id]), 'Entity was created');
-    $this->assertRaw($value, 'Value is displayed.');
+    $this->assertRaw($value);
 
     // Try to create entries with more than one decimal separator; assert fail.
     $wrong_entries = [
@@ -104,7 +104,7 @@ class NumberFieldTest extends BrowserTestBase {
         "{$field_name}[0][value]" => $wrong_entry,
       ];
       $this->drupalPostForm(NULL, $edit, t('Save'));
-      $this->assertRaw(t('%name must be a number.', ['%name' => $field_name]), 'Correctly failed to save decimal value with more than one decimal point.');
+      $this->assertRaw(t('%name must be a number.', ['%name' => $field_name]));
     }
 
     // Try to create entries with minus sign not in the first position.
@@ -122,7 +122,7 @@ class NumberFieldTest extends BrowserTestBase {
         "{$field_name}[0][value]" => $wrong_entry,
       ];
       $this->drupalPostForm(NULL, $edit, t('Save'));
-      $this->assertRaw(t('%name must be a number.', ['%name' => $field_name]), 'Correctly failed to save decimal value with minus sign in the wrong position.');
+      $this->assertRaw(t('%name must be a number.', ['%name' => $field_name]));
     }
   }
 
@@ -209,7 +209,7 @@ class NumberFieldTest extends BrowserTestBase {
       "{$field_name}[0][value]" => $minimum - 1,
     ];
     $this->drupalPostForm(NULL, $edit, t('Save'));
-    $this->assertRaw(t('%name must be higher than or equal to %minimum.', ['%name' => $field_name, '%minimum' => $minimum]), 'Correctly failed to save integer value less than minimum allowed value.');
+    $this->assertRaw(t('%name must be higher than or equal to %minimum.', ['%name' => $field_name, '%minimum' => $minimum]));
 
     // Try to set a decimal value
     $this->drupalGet('entity_test/add');
@@ -217,7 +217,7 @@ class NumberFieldTest extends BrowserTestBase {
       "{$field_name}[0][value]" => 1.5,
     ];
     $this->drupalPostForm(NULL, $edit, t('Save'));
-    $this->assertRaw(t('%name is not a valid number.', ['%name' => $field_name]), 'Correctly failed to save decimal value to integer field.');
+    $this->assertRaw(t('%name is not a valid number.', ['%name' => $field_name]));
 
     // Try to set a value above the maximum value
     $this->drupalGet('entity_test/add');
@@ -225,7 +225,7 @@ class NumberFieldTest extends BrowserTestBase {
       "{$field_name}[0][value]" => $maximum + 1,
     ];
     $this->drupalPostForm(NULL, $edit, t('Save'));
-    $this->assertRaw(t('%name must be lower than or equal to %maximum.', ['%name' => $field_name, '%maximum' => $maximum]), 'Correctly failed to save integer value greater than maximum allowed value.');
+    $this->assertRaw(t('%name must be lower than or equal to %maximum.', ['%name' => $field_name, '%maximum' => $maximum]));
 
     // Try to set a wrong integer value.
     $this->drupalGet('entity_test/add');
@@ -233,7 +233,7 @@ class NumberFieldTest extends BrowserTestBase {
       "{$field_name}[0][value]" => '20-40',
     ];
     $this->drupalPostForm(NULL, $edit, t('Save'));
-    $this->assertRaw(t('%name must be a number.', ['%name' => $field_name]), 'Correctly failed to save wrong integer value.');
+    $this->assertRaw(t('%name must be a number.', ['%name' => $field_name]));
 
     // Test with valid entries.
     $valid_entries = [
@@ -251,7 +251,7 @@ class NumberFieldTest extends BrowserTestBase {
       preg_match('|entity_test/manage/(\d+)|', $this->getUrl(), $match);
       $id = $match[1];
       $this->assertText(t('entity_test @id has been created.', ['@id' => $id]), 'Entity was created');
-      $this->assertRaw($valid_entry, 'Value is displayed.');
+      $this->assertRaw($valid_entry);
       $this->assertNoFieldByXpath('//div[@content="' . $valid_entry . '"]', NULL, 'The "content" attribute is not present since the Prefix is not being displayed');
     }
 
@@ -348,7 +348,7 @@ class NumberFieldTest extends BrowserTestBase {
         "{$field_name}[0][value]" => $wrong_entry,
       ];
       $this->drupalPostForm(NULL, $edit, t('Save'));
-      $this->assertRaw(t('%name must be a number.', ['%name' => $field_name]), 'Correctly failed to save float value with more than one decimal point.');
+      $this->assertRaw(t('%name must be a number.', ['%name' => $field_name]));
     }
 
     // Try to create entries with minus sign not in the first position.
@@ -366,7 +366,7 @@ class NumberFieldTest extends BrowserTestBase {
         "{$field_name}[0][value]" => $wrong_entry,
       ];
       $this->drupalPostForm(NULL, $edit, t('Save'));
-      $this->assertRaw(t('%name must be a number.', ['%name' => $field_name]), 'Correctly failed to save float value with minus sign in the wrong position.');
+      $this->assertRaw(t('%name must be a number.', ['%name' => $field_name]));
     }
   }
 
@@ -432,7 +432,7 @@ class NumberFieldTest extends BrowserTestBase {
     ];
     $this->drupalPostForm($field_configuration_url, $edit, t('Save settings'));
     // Check if an error message is shown.
-    $this->assertNoRaw(t('%name is not a valid number.', ['%name' => t('Minimum')]), 'Saved ' . gettype($minimum_value) . '  value as minimal value on a ' . $field->getType() . ' field');
+    $this->assertNoRaw(t('%name is not a valid number.', ['%name' => t('Minimum')]));
     // Check if a success message is shown.
     $this->assertRaw(t('Saved %label configuration.', ['%label' => $field->getLabel()]));
     // Check if the minimum value was actually set.
diff --git a/core/modules/field/tests/src/FunctionalJavascript/Number/NumberFieldTest.php b/core/modules/field/tests/src/FunctionalJavascript/Number/NumberFieldTest.php
index 00ada093732..39f5a6542b0 100644
--- a/core/modules/field/tests/src/FunctionalJavascript/Number/NumberFieldTest.php
+++ b/core/modules/field/tests/src/FunctionalJavascript/Number/NumberFieldTest.php
@@ -151,7 +151,7 @@ class NumberFieldTest extends WebDriverTestBase {
     // Check number_decimal and number_unformatted formatters behavior.
     $this->drupalGet('node/' . $node->id());
     $float_formatted = number_format($random_float, $scale, $decimal_separator, $thousand_separator);
-    $this->assertRaw("$prefix$float_formatted$suffix", 'Prefix and suffix added');
+    $this->assertRaw("$prefix$float_formatted$suffix");
     $this->assertRaw((string) $random_integer);
 
     // Configure the number_decimal formatter.
@@ -182,7 +182,7 @@ class NumberFieldTest extends WebDriverTestBase {
     $this->drupalGet('node/' . $node->id());
 
     $integer_formatted = number_format($random_integer, 0, '', $thousand_separator);
-    $this->assertRaw($integer_formatted, 'Random integer formatted');
+    $this->assertRaw($integer_formatted);
   }
 
 }
diff --git a/core/modules/field_ui/tests/src/Functional/ManageFieldsFunctionalTest.php b/core/modules/field_ui/tests/src/Functional/ManageFieldsFunctionalTest.php
index db4b08a65f5..9205070b33d 100644
--- a/core/modules/field_ui/tests/src/Functional/ManageFieldsFunctionalTest.php
+++ b/core/modules/field_ui/tests/src/Functional/ManageFieldsFunctionalTest.php
@@ -167,7 +167,7 @@ class ManageFieldsFunctionalTest extends BrowserTestBase {
     ];
     foreach ($table_headers as $table_header) {
       // We check that the label appear in the table headings.
-      $this->assertRaw($table_header . '</th>', new FormattableMarkup('%table_header table header was found.', ['%table_header' => $table_header]));
+      $this->assertRaw($table_header . '</th>');
     }
 
     // Test the "Add field" action link.
@@ -249,7 +249,7 @@ class ManageFieldsFunctionalTest extends BrowserTestBase {
   public function addExistingField() {
     // Check "Re-use existing field" appears.
     $this->drupalGet('admin/structure/types/manage/page/fields/add-field');
-    $this->assertRaw(t('Re-use an existing field'), '"Re-use existing field" was found.');
+    $this->assertRaw(t('Re-use an existing field'));
 
     // Check that fields of other entity types (here, the 'comment_body' field)
     // do not show up in the "Re-use existing field" list.
@@ -307,7 +307,7 @@ class ManageFieldsFunctionalTest extends BrowserTestBase {
       'cardinality_number' => 1,
     ];
     $this->drupalPostForm($field_edit_path, $edit, t('Save field settings'));
-    $this->assertRaw(t('There is @count entity with @delta or more values in this field.', ['@count' => 1, '@delta' => 2]), 'Correctly failed to set cardinality lower than highest delta.');
+    $this->assertRaw(t('There is @count entity with @delta or more values in this field.', ['@count' => 1, '@delta' => 2]));
 
     // Create a second entity with three values.
     $edit = ['title[0][value]' => 'Cardinality 3', 'body[0][value]' => 'Body 1', 'body[1][value]' => 'Body 2', 'body[2][value]' => 'Body 3'];
@@ -330,14 +330,14 @@ class ManageFieldsFunctionalTest extends BrowserTestBase {
       'cardinality_number' => 1,
     ];
     $this->drupalPostForm($field_edit_path, $edit, t('Save field settings'));
-    $this->assertRaw(t('There are @count entities with @delta or more values in this field.', ['@count' => 2, '@delta' => 2]), 'Correctly failed to set cardinality lower than highest delta.');
+    $this->assertRaw(t('There are @count entities with @delta or more values in this field.', ['@count' => 2, '@delta' => 2]));
 
     $edit = [
       'cardinality' => 'number',
       'cardinality_number' => 2,
     ];
     $this->drupalPostForm($field_edit_path, $edit, t('Save field settings'));
-    $this->assertRaw(t('There is @count entity with @delta or more values in this field.', ['@count' => 1, '@delta' => 3]), 'Correctly failed to set cardinality lower than highest delta.');
+    $this->assertRaw(t('There is @count entity with @delta or more values in this field.', ['@count' => 1, '@delta' => 3]));
 
     $edit = [
       'cardinality' => 'number',
@@ -373,7 +373,7 @@ class ManageFieldsFunctionalTest extends BrowserTestBase {
     }
     // Check "Re-use existing field" appears.
     $this->drupalGet('admin/structure/types/manage/page/fields/add-field');
-    $this->assertRaw(t('Re-use an existing field'), '"Re-use existing field" was found.');
+    $this->assertRaw(t('Re-use an existing field'));
 
     // Ensure that we test with a label that contains HTML.
     $label = $this->randomString(4) . '<br/>' . $this->randomString(4);
diff --git a/core/modules/field_ui/tests/src/Traits/FieldUiTestTrait.php b/core/modules/field_ui/tests/src/Traits/FieldUiTestTrait.php
index e5554cbdae5..86b92df295f 100644
--- a/core/modules/field_ui/tests/src/Traits/FieldUiTestTrait.php
+++ b/core/modules/field_ui/tests/src/Traits/FieldUiTestTrait.php
@@ -45,17 +45,17 @@ trait FieldUiTestTrait {
 
     // First step: 'Add field' page.
     $this->drupalPostForm($bundle_path, $initial_edit, t('Save and continue'));
-    $this->assertRaw(t('These settings apply to the %label field everywhere it is used.', ['%label' => $label]), 'Storage settings page was displayed.');
+    $this->assertRaw(t('These settings apply to the %label field everywhere it is used.', ['%label' => $label]));
     // Test Breadcrumbs.
     $this->assertSession()->linkExists($label, 0, 'Field label is correct in the breadcrumb of the storage settings page.');
 
     // Second step: 'Storage settings' form.
     $this->drupalPostForm(NULL, $storage_edit, t('Save field settings'));
-    $this->assertRaw(t('Updated field %label field settings.', ['%label' => $label]), 'Redirected to field settings page.');
+    $this->assertRaw(t('Updated field %label field settings.', ['%label' => $label]));
 
     // Third step: 'Field settings' form.
     $this->drupalPostForm(NULL, $field_edit, t('Save settings'));
-    $this->assertRaw(t('Saved %label configuration.', ['%label' => $label]), 'Redirected to "Manage fields" page.');
+    $this->assertRaw(t('Saved %label configuration.', ['%label' => $label]));
 
     // Check that the field appears in the overview form.
     $this->assertFieldByXPath('//table[@id="field-overview"]//tr/td[1]', $label, 'Field was created and appears in the overview page.');
@@ -86,12 +86,13 @@ trait FieldUiTestTrait {
     $this->drupalPostForm("$bundle_path/fields/add-field", $initial_edit, t('Save and continue'));
     // Set the main content to only the content region because the label can
     // contain HTML which will be auto-escaped by Twig.
-    $this->assertRaw('field-config-edit-form', 'The field config edit form is present.');
-    $this->assertNoRaw('&amp;lt;', 'The page does not have double escaped HTML tags.');
+    $this->assertRaw('field-config-edit-form');
+    // Check that the page does not have double escaped HTML tags.
+    $this->assertNoRaw('&amp;lt;');
 
     // Second step: 'Field settings' form.
     $this->drupalPostForm(NULL, $field_edit, t('Save settings'));
-    $this->assertRaw(t('Saved %label configuration.', ['%label' => $label]), 'Redirected to "Manage fields" page.');
+    $this->assertRaw(t('Saved %label configuration.', ['%label' => $label]));
 
     // Check that the field appears in the overview form.
     $this->assertFieldByXPath('//table[@id="field-overview"]//tr/td[1]', $label, 'Field was created and appears in the overview page.');
@@ -112,14 +113,14 @@ trait FieldUiTestTrait {
   public function fieldUIDeleteField($bundle_path, $field_name, $label, $bundle_label) {
     // Display confirmation form.
     $this->drupalGet("$bundle_path/fields/$field_name/delete");
-    $this->assertRaw(t('Are you sure you want to delete the field %label', ['%label' => $label]), 'Delete confirmation was found.');
+    $this->assertRaw(t('Are you sure you want to delete the field %label', ['%label' => $label]));
 
     // Test Breadcrumbs.
     $this->assertSession()->linkExists($label, 0, 'Field label is correct in the breadcrumb of the field delete page.');
 
     // Submit confirmation form.
     $this->drupalPostForm(NULL, [], t('Delete'));
-    $this->assertRaw(t('The field %label has been deleted from the %type content type.', ['%label' => $label, '%type' => $bundle_label]), 'Delete message was found.');
+    $this->assertRaw(t('The field %label has been deleted from the %type content type.', ['%label' => $label, '%type' => $bundle_label]));
 
     // Check that the field does not appear in the overview form.
     $this->assertNoFieldByXPath('//table[@id="field-overview"]//span[@class="label-field"]', $label, 'Field does not appear in the overview page.');
diff --git a/core/modules/file/tests/src/Functional/FileFieldDisplayTest.php b/core/modules/file/tests/src/Functional/FileFieldDisplayTest.php
index 7b3a92e8c54..79684571c4e 100644
--- a/core/modules/file/tests/src/Functional/FileFieldDisplayTest.php
+++ b/core/modules/file/tests/src/Functional/FileFieldDisplayTest.php
@@ -79,13 +79,13 @@ class FileFieldDisplayTest extends FileFieldTestBase {
       '#file' => $node_file,
     ];
     $default_output = \Drupal::service('renderer')->renderRoot($file_link);
-    $this->assertRaw($default_output, 'Default formatter displaying correctly on full node view.');
+    $this->assertRaw($default_output);
 
     // Turn the "display" option off and check that the file is no longer displayed.
     $edit = [$field_name . '[0][display]' => FALSE];
     $this->drupalPostForm('node/' . $nid . '/edit', $edit, t('Save'));
 
-    $this->assertNoRaw($default_output, 'Field is hidden when "display" option is unchecked.');
+    $this->assertNoRaw($default_output);
 
     // Add a description and make sure that it is displayed.
     $description = $this->randomMachineName();
@@ -110,8 +110,10 @@ class FileFieldDisplayTest extends FileFieldTestBase {
     $edit[$field_name . '[1][display]'] = FALSE;
     $this->drupalPostForm(NULL, $edit, t('Preview'));
     $this->clickLink(t('Back to content editing'));
-    $this->assertRaw($field_name . '[0][display]', 'First file appears as expected.');
-    $this->assertRaw($field_name . '[1][display]', 'Second file appears as expected.');
+    // First file.
+    $this->assertRaw($field_name . '[0][display]');
+    // Second file.
+    $this->assertRaw($field_name . '[1][display]');
     $this->assertSession()->responseContains($field_name . '[1][description]');
 
     // Check that the file fields don't contain duplicate HTML IDs.
diff --git a/core/modules/file/tests/src/Functional/FileFieldValidateTest.php b/core/modules/file/tests/src/Functional/FileFieldValidateTest.php
index 51698a6257f..9b4d14bd50d 100644
--- a/core/modules/file/tests/src/Functional/FileFieldValidateTest.php
+++ b/core/modules/file/tests/src/Functional/FileFieldValidateTest.php
@@ -36,7 +36,7 @@ class FileFieldValidateTest extends FileFieldTestBase {
     $edit = [];
     $edit['title[0][value]'] = $this->randomMachineName();
     $this->drupalPostForm('node/add/' . $type_name, $edit, t('Save'));
-    $this->assertRaw(t('@title field is required.', ['@title' => $field->getLabel()]), 'Node save failed when required file field was empty.');
+    $this->assertRaw(t('@title field is required.', ['@title' => $field->getLabel()]));
 
     // Create a new node with the uploaded file.
     $nid = $this->uploadNodeFile($test_file, $field_name, $type_name);
@@ -57,7 +57,7 @@ class FileFieldValidateTest extends FileFieldTestBase {
     $edit = [];
     $edit['title[0][value]'] = $this->randomMachineName();
     $this->drupalPostForm('node/add/' . $type_name, $edit, t('Save'));
-    $this->assertRaw(t('@title field is required.', ['@title' => $field->getLabel()]), 'Node save failed when required multiple value file field was empty.');
+    $this->assertRaw(t('@title field is required.', ['@title' => $field->getLabel()]));
 
     // Create a new node with the uploaded file into the multivalue field.
     $nid = $this->uploadNodeFile($test_file, $field_name, $type_name);
@@ -104,7 +104,7 @@ class FileFieldValidateTest extends FileFieldTestBase {
       // Check that uploading the large file fails (1M limit).
       $this->uploadNodeFile($large_file, $field_name, $type_name);
       $error_message = t('The file is %filesize exceeding the maximum file size of %maxsize.', ['%filesize' => format_size($large_file->getSize()), '%maxsize' => format_size($file_limit)]);
-      $this->assertRaw($error_message, new FormattableMarkup('Node save failed when file (%filesize) exceeded the max upload size (%maxsize).', ['%filesize' => format_size($large_file->getSize()), '%maxsize' => $max_filesize]));
+      $this->assertRaw($error_message);
     }
 
     // Turn off the max filesize.
@@ -148,7 +148,7 @@ class FileFieldValidateTest extends FileFieldTestBase {
     // Check that the file with the wrong extension cannot be uploaded.
     $this->uploadNodeFile($test_file, $field_name, $type_name);
     $error_message = t('Only files with the following extensions are allowed: %files-allowed.', ['%files-allowed' => 'txt']);
-    $this->assertRaw($error_message, 'Node save failed when file uploaded with the wrong extension.');
+    $this->assertRaw($error_message);
 
     // Enable extension checking for text and image files.
     $this->updateFileField($field_name, $type_name, ['file_extensions' => "txt $test_file_extension"]);
diff --git a/core/modules/file/tests/src/Functional/FileFieldWidgetTest.php b/core/modules/file/tests/src/Functional/FileFieldWidgetTest.php
index e7b9c19c126..156326713cc 100644
--- a/core/modules/file/tests/src/Functional/FileFieldWidgetTest.php
+++ b/core/modules/file/tests/src/Functional/FileFieldWidgetTest.php
@@ -376,12 +376,12 @@ class FileFieldWidgetTest extends FileFieldTestBase {
     $this->drupalPostForm(NULL, $edit, t('Upload'));
 
     $error_message = t('Only files with the following extensions are allowed: %files-allowed.', ['%files-allowed' => 'txt']);
-    $this->assertRaw($error_message, t('Validation error when file with wrong extension uploaded (JSMode=%type).', ['%type' => $type]));
+    $this->assertRaw($error_message);
 
     // Upload file with correct extension, check that error message is removed.
     $edit[$name] = \Drupal::service('file_system')->realpath($test_file_text->getFileUri());
     $this->drupalPostForm(NULL, $edit, t('Upload'));
-    $this->assertNoRaw($error_message, t('Validation error removed when file with correct extension uploaded (JSMode=%type).', ['%type' => $type]));
+    $this->assertNoRaw($error_message);
   }
 
   /**
diff --git a/core/modules/file/tests/src/Functional/FileManagedFileElementTest.php b/core/modules/file/tests/src/Functional/FileManagedFileElementTest.php
index 3f67a7948a8..8b2176f4460 100644
--- a/core/modules/file/tests/src/Functional/FileManagedFileElementTest.php
+++ b/core/modules/file/tests/src/Functional/FileManagedFileElementTest.php
@@ -38,7 +38,7 @@ class FileManagedFileElementTest extends FileFieldTestBase {
 
           // Submit without a file.
           $this->drupalPostForm($path, [], t('Save'));
-          $this->assertRaw(t('The file ids are %fids.', ['%fids' => implode(',', [])]), 'Submitted without a file.');
+          $this->assertRaw(t('The file ids are %fids.', ['%fids' => implode(',', [])]));
 
           // Submit with a file, but with an invalid form token. Ensure the file
           // was not saved.
@@ -60,11 +60,11 @@ class FileManagedFileElementTest extends FileFieldTestBase {
           $this->drupalPostForm($path, $edit, t('Save'));
           $last_fid = $this->getLastFileId();
           $this->assertTrue($last_fid > $last_fid_prior, 'New file got saved.');
-          $this->assertRaw(t('The file ids are %fids.', ['%fids' => implode(',', [$last_fid])]), 'Submit handler has correct file info.');
+          $this->assertRaw(t('The file ids are %fids.', ['%fids' => implode(',', [$last_fid])]));
 
           // Submit no new input, but with a default file.
           $this->drupalPostForm($path . '/' . $last_fid, [], t('Save'));
-          $this->assertRaw(t('The file ids are %fids.', ['%fids' => implode(',', [$last_fid])]), 'Empty submission did not change an existing file.');
+          $this->assertRaw(t('The file ids are %fids.', ['%fids' => implode(',', [$last_fid])]));
 
           // Upload, then Submit.
           $last_fid_prior = $this->getLastFileId();
@@ -74,7 +74,7 @@ class FileManagedFileElementTest extends FileFieldTestBase {
           $last_fid = $this->getLastFileId();
           $this->assertTrue($last_fid > $last_fid_prior, 'New file got uploaded.');
           $this->drupalPostForm(NULL, [], t('Save'));
-          $this->assertRaw(t('The file ids are %fids.', ['%fids' => implode(',', [$last_fid])]), 'Submit handler has correct file info.');
+          $this->assertRaw(t('The file ids are %fids.', ['%fids' => implode(',', [$last_fid])]));
 
           // Remove, then Submit.
           $remove_button_title = $multiple ? t('Remove selected') : t('Remove');
@@ -86,7 +86,7 @@ class FileManagedFileElementTest extends FileFieldTestBase {
           $this->drupalGet($path . '/' . $last_fid);
           $this->drupalPostForm(NULL, $remove_edit, $remove_button_title);
           $this->drupalPostForm(NULL, [], t('Save'));
-          $this->assertRaw(t('The file ids are %fids.', ['%fids' => '']), 'Submission after file removal was successful.');
+          $this->assertRaw(t('The file ids are %fids.', ['%fids' => '']));
 
           // Upload, then Remove, then Submit.
           $this->drupalGet($path);
@@ -100,7 +100,7 @@ class FileManagedFileElementTest extends FileFieldTestBase {
           $this->drupalPostForm(NULL, $remove_edit, $remove_button_title);
 
           $this->drupalPostForm(NULL, [], t('Save'));
-          $this->assertRaw(t('The file ids are %fids.', ['%fids' => '']), 'Submission after file upload and removal was successful.');
+          $this->assertRaw(t('The file ids are %fids.', ['%fids' => '']));
         }
       }
     }
@@ -124,7 +124,8 @@ class FileManagedFileElementTest extends FileFieldTestBase {
 
     // Save the entire form.
     $this->drupalPostForm(NULL, [], t('Save'));
-    $this->assertRaw(t('The file ids are %fids.', ['%fids' => implode(',', $fid_list)]), 'Two files saved into a single multiple file element.');
+    // Check that two files are saved into a single multiple file element.
+    $this->assertRaw(t('The file ids are %fids.', ['%fids' => implode(',', $fid_list)]));
 
     // Delete only the first file.
     $edit = [
diff --git a/core/modules/file/tests/src/Functional/FilePrivateTest.php b/core/modules/file/tests/src/Functional/FilePrivateTest.php
index 7b3224a2b21..925499e7ad2 100644
--- a/core/modules/file/tests/src/Functional/FilePrivateTest.php
+++ b/core/modules/file/tests/src/Functional/FilePrivateTest.php
@@ -57,7 +57,7 @@ class FilePrivateTest extends FileFieldTestBase {
     $node_file = File::load($node->{$field_name}->target_id);
     // Ensure the file can be viewed.
     $this->drupalGet('node/' . $node->id());
-    $this->assertRaw($node_file->getFilename(), 'File reference is displayed after attaching it');
+    $this->assertRaw($node_file->getFilename());
     // Ensure the file can be downloaded.
     $this->drupalGet(file_create_url($node_file->getFileUri()));
     $this->assertSession()->statusCodeEquals(200);
diff --git a/core/modules/file/tests/src/Functional/SaveUploadFormTest.php b/core/modules/file/tests/src/Functional/SaveUploadFormTest.php
index bd7891920bd..07524ad439e 100644
--- a/core/modules/file/tests/src/Functional/SaveUploadFormTest.php
+++ b/core/modules/file/tests/src/Functional/SaveUploadFormTest.php
@@ -87,7 +87,7 @@ class SaveUploadFormTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called then clean out the hook
     // counters.
@@ -166,8 +166,8 @@ class SaveUploadFormTest extends FileManagedTestBase {
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
     $message = t('Only files with the following extensions are allowed:') . ' <em class="placeholder">' . $extensions . '</em>';
-    $this->assertRaw($message, 'Cannot upload a disallowed extension');
-    $this->assertRaw(t('Epic upload FAIL!'), 'Found the failure message.');
+    $this->assertRaw($message);
+    $this->assertRaw(t('Epic upload FAIL!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate']);
@@ -185,8 +185,8 @@ class SaveUploadFormTest extends FileManagedTestBase {
 
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertNoRaw(t('Only files with the following extensions are allowed:'), 'Can upload an allowed extension.');
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertNoRaw(t('Only files with the following extensions are allowed:'));
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'load', 'update']);
@@ -202,8 +202,8 @@ class SaveUploadFormTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertNoRaw(t('Only files with the following extensions are allowed:'), 'Can upload any extension.');
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertNoRaw(t('Only files with the following extensions are allowed:'));
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'load', 'update']);
@@ -228,9 +228,9 @@ class SaveUploadFormTest extends FileManagedTestBase {
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
     $message = t('For security reasons, your upload has been renamed to') . ' <em class="placeholder">' . $this->phpfile->filename . '.txt' . '</em>';
-    $this->assertRaw($message, 'Dangerous file was renamed.');
-    $this->assertRaw(t('File MIME type is text/plain.'), "Dangerous file's MIME type was changed.");
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw($message);
+    $this->assertRaw(t('File MIME type is text/plain.'));
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'insert']);
@@ -243,9 +243,9 @@ class SaveUploadFormTest extends FileManagedTestBase {
 
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertNoRaw(t('For security reasons, your upload has been renamed'), 'Found no security message.');
-    $this->assertRaw(t('File name is @filename', ['@filename' => $this->phpfile->filename]), 'Dangerous file was not renamed when insecure uploads is TRUE.');
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertNoRaw(t('For security reasons, your upload has been renamed'));
+    $this->assertRaw(t('File name is @filename', ['@filename' => $this->phpfile->filename]));
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'insert']);
@@ -279,9 +279,9 @@ class SaveUploadFormTest extends FileManagedTestBase {
 
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('For security reasons, your upload has been renamed'), 'Found security message.');
-    $this->assertRaw(t('File name is @filename', ['@filename' => $munged_filename]), 'File was successfully munged.');
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('For security reasons, your upload has been renamed'));
+    $this->assertRaw(t('File name is @filename', ['@filename' => $munged_filename]));
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'insert']);
@@ -297,9 +297,9 @@ class SaveUploadFormTest extends FileManagedTestBase {
 
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertNoRaw(t('For security reasons, your upload has been renamed'), 'Found no security message.');
-    $this->assertRaw(t('File name is @filename', ['@filename' => $this->image->getFilename()]), 'File was not munged when allowing any extension.');
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertNoRaw(t('For security reasons, your upload has been renamed'));
+    $this->assertRaw(t('File name is @filename', ['@filename' => $this->image->getFilename()]));
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'insert']);
@@ -317,7 +317,7 @@ class SaveUploadFormTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'insert']);
@@ -335,7 +335,7 @@ class SaveUploadFormTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'load', 'update']);
@@ -353,7 +353,7 @@ class SaveUploadFormTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('Epic upload FAIL!'), 'Found the failure message.');
+    $this->assertRaw(t('Epic upload FAIL!'));
 
     // Check that the no hooks were called while failing.
     $this->assertFileHooksCalled([]);
@@ -364,7 +364,7 @@ class SaveUploadFormTest extends FileManagedTestBase {
    */
   public function testNoUpload() {
     $this->drupalPostForm('file-test/save_upload_from_form_test', [], t('Submit'));
-    $this->assertNoRaw(t('Epic upload FAIL!'), 'Failure message not found.');
+    $this->assertNoRaw(t('Epic upload FAIL!'));
   }
 
   /**
@@ -386,8 +386,8 @@ class SaveUploadFormTest extends FileManagedTestBase {
     \Drupal::state()->set('file_test.disable_error_collection', TRUE);
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('File upload error. Could not move uploaded file.'), 'Found the failure message.');
-    $this->assertRaw(t('Epic upload FAIL!'), 'Found the failure message.');
+    $this->assertRaw(t('File upload error. Could not move uploaded file.'));
+    $this->assertRaw(t('Epic upload FAIL!'));
 
     // Uploading failed. Now check the log.
     $this->drupalGet('admin/reports/dblog');
@@ -395,7 +395,7 @@ class SaveUploadFormTest extends FileManagedTestBase {
     $this->assertRaw(t('Upload error. Could not move uploaded file @file to destination @destination.', [
       '@file' => $this->image->getFilename(),
       '@destination' => 'temporary://' . $test_directory . '/' . $this->image->getFilename(),
-    ]), 'Found upload error log entry.');
+    ]));
   }
 
   /**
@@ -412,7 +412,7 @@ class SaveUploadFormTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('You WIN!'));
 
     // Ensure the expected error message is present and the counts before and
     // after calling _file_save_upload_from_form() are correct.
@@ -428,7 +428,7 @@ class SaveUploadFormTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('Epic upload FAIL!'), 'Found the failure message.');
+    $this->assertRaw(t('Epic upload FAIL!'));
 
     // Ensure the expected error message is present and the counts before and
     // after calling _file_save_upload_from_form() are correct.
@@ -442,7 +442,7 @@ class SaveUploadFormTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('You WIN!'));
 
     // Ensure the error message is not present and the counts before and after
     // calling _file_save_upload_from_form() are correct.
@@ -476,10 +476,10 @@ class SaveUploadFormTest extends FileManagedTestBase {
     $files['files']['file_test_upload'][1] = $file_system->realpath($textfile->uri);
     $client->request($form->getMethod(), $form->getUri(), $edit, $files);
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('Epic upload FAIL!'), 'Found the failure message.');
+    $this->assertRaw(t('Epic upload FAIL!'));
 
     // Search for combined error message followed by a formatted list of messages.
-    $this->assertRaw(t('One or more files could not be uploaded.') . '<div class="item-list">', 'Error message contains combined list of validation errors.');
+    $this->assertRaw(t('One or more files could not be uploaded.') . '<div class="item-list">');
   }
 
   /**
@@ -496,7 +496,7 @@ class SaveUploadFormTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/save_upload_from_form_test', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('Epic upload FAIL!'), 'Found the failure message.');
+    $this->assertRaw(t('Epic upload FAIL!'));
     $this->assertCount(1, $this->cssSelect('input[name="files[file_test_upload][]"].error'), 'File upload field has error.');
   }
 
diff --git a/core/modules/file/tests/src/Functional/SaveUploadTest.php b/core/modules/file/tests/src/Functional/SaveUploadTest.php
index c4d9ee49f38..04802f32961 100644
--- a/core/modules/file/tests/src/Functional/SaveUploadTest.php
+++ b/core/modules/file/tests/src/Functional/SaveUploadTest.php
@@ -82,7 +82,8 @@ class SaveUploadTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    // Check that the success message is present.
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called then clean out the hook
     // counters.
@@ -186,8 +187,8 @@ class SaveUploadTest extends FileManagedTestBase {
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
     $message = t('Only files with the following extensions are allowed:') . ' <em class="placeholder">' . $extensions . '</em>';
-    $this->assertRaw($message, 'Cannot upload a disallowed extension');
-    $this->assertRaw(t('Epic upload FAIL!'), 'Found the failure message.');
+    $this->assertRaw($message);
+    $this->assertRaw(t('Epic upload FAIL!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate']);
@@ -205,8 +206,8 @@ class SaveUploadTest extends FileManagedTestBase {
 
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertNoRaw(t('Only files with the following extensions are allowed:'), 'Can upload an allowed extension.');
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertNoRaw(t('Only files with the following extensions are allowed:'));
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'load', 'update']);
@@ -222,8 +223,8 @@ class SaveUploadTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertNoRaw(t('Only files with the following extensions are allowed:'), 'Can upload any extension.');
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertNoRaw(t('Only files with the following extensions are allowed:'));
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'load', 'update']);
@@ -246,10 +247,10 @@ class SaveUploadTest extends FileManagedTestBase {
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
     $message = t('For security reasons, your upload has been renamed to') . ' <em class="placeholder">' . $this->phpfile->filename . '.txt' . '</em>';
-    $this->assertRaw($message, 'Dangerous file was renamed.');
+    $this->assertRaw($message);
     $this->assertSession()->pageTextContains('File name is php-2.php.txt.');
-    $this->assertRaw(t('File MIME type is text/plain.'), "Dangerous file's MIME type was changed.");
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('File MIME type is text/plain.'));
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'insert']);
@@ -262,9 +263,9 @@ class SaveUploadTest extends FileManagedTestBase {
 
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertNoRaw(t('For security reasons, your upload has been renamed'), 'Found no security message.');
+    $this->assertNoRaw(t('For security reasons, your upload has been renamed'));
     $this->assertSession()->pageTextContains('File name is php-2.php.');
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'insert']);
@@ -296,9 +297,9 @@ class SaveUploadTest extends FileManagedTestBase {
 
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('For security reasons, your upload has been renamed'), 'Found security message.');
-    $this->assertRaw(t('File name is @filename', ['@filename' => $munged_filename]), 'File was successfully munged.');
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('For security reasons, your upload has been renamed'));
+    $this->assertRaw(t('File name is @filename', ['@filename' => $munged_filename]));
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'insert']);
@@ -314,9 +315,9 @@ class SaveUploadTest extends FileManagedTestBase {
 
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertNoRaw(t('For security reasons, your upload has been renamed'), 'Found no security message.');
-    $this->assertRaw(t('File name is @filename', ['@filename' => $this->image->getFilename()]), 'File was not munged when allowing any extension.');
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertNoRaw(t('For security reasons, your upload has been renamed'));
+    $this->assertRaw(t('File name is @filename', ['@filename' => $this->image->getFilename()]));
+    $this->assertRaw(t('You WIN!'));
 
     // Check that the correct hooks were called.
     $this->assertFileHooksCalled(['validate', 'insert']);
@@ -332,7 +333,7 @@ class SaveUploadTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('You WIN!'));
     $this->assertSession()->pageTextContains('File name is image-test_0.png.');
 
     // Check that the correct hooks were called.
@@ -349,7 +350,7 @@ class SaveUploadTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('You WIN!'));
     $this->assertSession()->pageTextContains('File name is image-test.png.');
 
     // Check that the correct hooks were called.
@@ -366,7 +367,7 @@ class SaveUploadTest extends FileManagedTestBase {
     ];
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('Epic upload FAIL!'), 'Found the failure message.');
+    $this->assertRaw(t('Epic upload FAIL!'));
 
     // Check that the no hooks were called while failing.
     $this->assertFileHooksCalled([]);
@@ -377,7 +378,7 @@ class SaveUploadTest extends FileManagedTestBase {
    */
   public function testNoUpload() {
     $this->drupalPostForm('file-test/upload', [], t('Submit'));
-    $this->assertNoRaw(t('Epic upload FAIL!'), 'Failure message not found.');
+    $this->assertNoRaw(t('Epic upload FAIL!'));
   }
 
   /**
@@ -399,8 +400,8 @@ class SaveUploadTest extends FileManagedTestBase {
     \Drupal::state()->set('file_test.disable_error_collection', TRUE);
     $this->drupalPostForm('file-test/upload', $edit, t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('File upload error. Could not move uploaded file.'), 'Found the failure message.');
-    $this->assertRaw(t('Epic upload FAIL!'), 'Found the failure message.');
+    $this->assertRaw(t('File upload error. Could not move uploaded file.'));
+    $this->assertRaw(t('Epic upload FAIL!'));
 
     // Uploading failed. Now check the log.
     $this->drupalGet('admin/reports/dblog');
@@ -408,7 +409,7 @@ class SaveUploadTest extends FileManagedTestBase {
     $this->assertRaw(t('Upload error. Could not move uploaded file @file to destination @destination.', [
       '@file' => $this->image->getFilename(),
       '@destination' => 'temporary://' . $test_directory . '/' . $this->image->getFilename(),
-    ]), 'Found upload error log entry.');
+    ]));
   }
 
   /**
diff --git a/core/modules/filter/tests/src/Functional/FilterAdminTest.php b/core/modules/filter/tests/src/Functional/FilterAdminTest.php
index 9ddc4f204ad..452df147885 100644
--- a/core/modules/filter/tests/src/Functional/FilterAdminTest.php
+++ b/core/modules/filter/tests/src/Functional/FilterAdminTest.php
@@ -204,7 +204,7 @@ class FilterAdminTest extends BrowserTestBase {
     // Check that the fallback format exists and cannot be disabled.
     $this->assertTrue($plain == filter_fallback_format(), 'The fallback format is set to plain text.');
     $this->drupalGet('admin/config/content/formats');
-    $this->assertNoRaw('admin/config/content/formats/manage/' . $plain . '/disable', 'Disable link for the fallback format not found.');
+    $this->assertNoRaw('admin/config/content/formats/manage/' . $plain . '/disable');
     $this->drupalGet('admin/config/content/formats/manage/' . $plain . '/disable');
     $this->assertSession()->statusCodeEquals(403);
 
@@ -261,7 +261,7 @@ class FilterAdminTest extends BrowserTestBase {
     $edit['filters[' . $first_filter . '][status]'] = TRUE;
     $this->drupalPostForm('admin/config/content/formats/add', $edit, t('Save configuration'));
     $this->assertSession()->addressEquals('admin/config/content/formats');
-    $this->assertRaw(t('Added text format %format.', ['%format' => $edit['name']]), 'New filter created.');
+    $this->assertRaw(t('Added text format %format.', ['%format' => $edit['name']]));
 
     filter_formats_reset();
     $format = FilterFormat::load($edit['format']);
@@ -274,7 +274,7 @@ class FilterAdminTest extends BrowserTestBase {
     // Disable new filter.
     $this->drupalPostForm('admin/config/content/formats/manage/' . $format->id() . '/disable', [], t('Disable'));
     $this->assertSession()->addressEquals('admin/config/content/formats');
-    $this->assertRaw(t('Disabled text format %format.', ['%format' => $edit['name']]), 'Format successfully disabled.');
+    $this->assertRaw(t('Disabled text format %format.', ['%format' => $edit['name']]));
 
     // Allow authenticated users on full HTML.
     $format = FilterFormat::load($full);
@@ -283,13 +283,13 @@ class FilterAdminTest extends BrowserTestBase {
     $edit['roles[' . RoleInterface::AUTHENTICATED_ID . ']'] = 1;
     $this->drupalPostForm('admin/config/content/formats/manage/' . $full, $edit, t('Save configuration'));
     $this->assertSession()->addressEquals('admin/config/content/formats/manage/' . $full);
-    $this->assertRaw(t('The text format %format has been updated.', ['%format' => $format->label()]), 'Full HTML format successfully updated.');
+    $this->assertRaw(t('The text format %format has been updated.', ['%format' => $format->label()]));
 
     // Switch user.
     $this->drupalLogin($this->webUser);
 
     $this->drupalGet('node/add/page');
-    $this->assertRaw('<option value="' . $full . '">Full HTML</option>', 'Full HTML filter accessible.');
+    $this->assertRaw('<option value="' . $full . '">Full HTML</option>');
 
     // Use basic HTML and see if it removes tags that are not allowed.
     $body = '<em>' . $this->randomMachineName() . '</em>';
@@ -311,7 +311,8 @@ class FilterAdminTest extends BrowserTestBase {
     $this->assertNotEmpty($node, 'Node found in database.');
 
     $this->drupalGet('node/' . $node->id());
-    $this->assertRaw($body . $extra_text, 'Filter removed invalid tag.');
+    // Check that filter removed invalid tag.
+    $this->assertRaw($body . $extra_text);
 
     // Use plain text and see if it escapes all tags, whether allowed or not.
     // In order to test plain text, we have to enable the hidden variable for
@@ -345,7 +346,7 @@ class FilterAdminTest extends BrowserTestBase {
     $edit['roles[' . RoleInterface::AUTHENTICATED_ID . ']'] = FALSE;
     $this->drupalPostForm('admin/config/content/formats/manage/' . $full, $edit, t('Save configuration'));
     $this->assertSession()->addressEquals('admin/config/content/formats/manage/' . $full);
-    $this->assertRaw(t('The text format %format has been updated.', ['%format' => $format->label()]), 'Full HTML format successfully reverted.');
+    $this->assertRaw(t('The text format %format has been updated.', ['%format' => $format->label()]));
     $this->drupalGet('admin/config/content/formats/manage/' . $full);
     $this->assertFieldByName('roles[' . RoleInterface::AUTHENTICATED_ID . ']', $edit['roles[' . RoleInterface::AUTHENTICATED_ID . ']'], 'Changes reverted.');
 
diff --git a/core/modules/forum/tests/src/Functional/ForumTest.php b/core/modules/forum/tests/src/Functional/ForumTest.php
index 28ceb971809..790b88426b2 100644
--- a/core/modules/forum/tests/src/Functional/ForumTest.php
+++ b/core/modules/forum/tests/src/Functional/ForumTest.php
@@ -135,7 +135,7 @@ class ForumTest extends BrowserTestBase {
     // Check that the basic forum install creates a default forum topic
     $this->drupalGet('/forum');
     // Look for the "General discussion" default forum
-    $this->assertRaw(Link::createFromRoute(t('General discussion'), 'forum.page', ['taxonomy_term' => 1])->toString(), "Found the default forum at the /forum listing");
+    $this->assertRaw(Link::createFromRoute(t('General discussion'), 'forum.page', ['taxonomy_term' => 1])->toString());
     // Check the presence of expected cache tags.
     $this->assertSession()->responseHeaderContains('X-Drupal-Cache-Tags', 'config:forum.settings');
 
@@ -326,13 +326,13 @@ class ForumTest extends BrowserTestBase {
     $this->assertSession()->linkExists('Add forum');
     $this->assertSession()->linkExists('Add container');
     $this->clickLink('edit container');
-    $this->assertRaw('Edit container', 'Followed the link to edit the container');
+    $this->assertRaw('Edit container');
     // Create forum inside the forum container.
     $this->forum = $this->createForum('forum', $this->forumContainer['tid']);
     // Verify the "edit forum" link exists and functions correctly.
     $this->drupalGet('admin/structure/forum');
     $this->clickLink('edit forum');
-    $this->assertRaw('Edit forum', 'Followed the link to edit the forum');
+    $this->assertRaw('Edit forum');
     // Navigate back to forum structure page.
     $this->drupalGet('admin/structure/forum');
     // Create second forum in container, destined to be deleted below.
@@ -395,7 +395,7 @@ class ForumTest extends BrowserTestBase {
     // Edit the vocabulary.
     $this->drupalPostForm('admin/structure/taxonomy/manage/' . $original_vocabulary->id(), $edit, t('Save'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('Updated vocabulary %name.', ['%name' => $edit['name']]), 'Vocabulary was edited');
+    $this->assertRaw(t('Updated vocabulary %name.', ['%name' => $edit['name']]));
 
     // Grab the newly edited vocabulary.
     $current_vocabulary = Vocabulary::load($vid);
@@ -581,12 +581,12 @@ class ForumTest extends BrowserTestBase {
     $type = t('Forum topic');
     if ($container) {
       $this->assertNoText("$type $title has been created.", 'Forum topic was not created');
-      $this->assertRaw(t('The item %title is a forum container, not a forum.', ['%title' => $forum['name']]), 'Error message was shown');
+      $this->assertRaw(t('The item %title is a forum container, not a forum.', ['%title' => $forum['name']]));
       return;
     }
     else {
       $this->assertText(t('@type @title has been created.', ['@type' => $type, '@title' => $title]), 'Forum topic was created');
-      $this->assertNoRaw(t('The item %title is a forum container, not a forum.', ['%title' => $forum['name']]), 'No error message was shown');
+      $this->assertNoRaw(t('The item %title is a forum container, not a forum.', ['%title' => $forum['name']]));
 
       // Verify that the creation message contains a link to a node.
       $this->assertSession()->elementExists('xpath', '//div[@data-drupal-messages]//a[contains(@href, "node/")]');
@@ -599,8 +599,8 @@ class ForumTest extends BrowserTestBase {
 
     // View forum topic.
     $this->drupalGet('node/' . $node->id());
-    $this->assertRaw($title, 'Subject was found');
-    $this->assertRaw($body, 'Body was found');
+    $this->assertRaw($title);
+    $this->assertRaw($body);
 
     return $node;
   }
@@ -647,7 +647,7 @@ class ForumTest extends BrowserTestBase {
       '#theme' => 'breadcrumb',
       '#links' => $breadcrumb_build,
     ];
-    $this->assertRaw(\Drupal::service('renderer')->renderRoot($breadcrumb), 'Breadcrumbs were displayed');
+    $this->assertRaw(\Drupal::service('renderer')->renderRoot($breadcrumb));
 
     // View forum edit node.
     $this->drupalGet('node/' . $node->id() . '/edit');
@@ -681,7 +681,7 @@ class ForumTest extends BrowserTestBase {
       // Delete forum node.
       $this->drupalPostForm('node/' . $node->id() . '/delete', [], t('Delete'));
       $this->assertSession()->statusCodeEquals($response);
-      $this->assertRaw(t('Forum topic %title has been deleted.', ['%title' => $edit['title[0][value]']]), 'Forum node was deleted');
+      $this->assertRaw(t('Forum topic %title has been deleted.', ['%title' => $edit['title[0][value]']]));
     }
   }
 
@@ -711,7 +711,7 @@ class ForumTest extends BrowserTestBase {
       '#theme' => 'breadcrumb',
       '#links' => $breadcrumb_build,
     ];
-    $this->assertRaw(\Drupal::service('renderer')->renderRoot($breadcrumb), 'Breadcrumbs were displayed');
+    $this->assertRaw(\Drupal::service('renderer')->renderRoot($breadcrumb));
   }
 
   /**
diff --git a/core/modules/help/tests/src/Functional/HelpTest.php b/core/modules/help/tests/src/Functional/HelpTest.php
index a6beca0cc6a..541211c8766 100644
--- a/core/modules/help/tests/src/Functional/HelpTest.php
+++ b/core/modules/help/tests/src/Functional/HelpTest.php
@@ -77,11 +77,11 @@ class HelpTest extends BrowserTestBase {
 
     // Verify that hook_help() section title and description appear.
     $this->assertRaw('<h2>' . t('Module overviews') . '</h2>');
-    $this->assertRaw('<p>' . t('Module overviews are provided by modules. Overviews available for your installed modules:'), '</p>');
+    $this->assertRaw('<p>' . t('Module overviews are provided by modules. Overviews available for your installed modules:') . '</p>');
 
     // Verify that an empty section is handled correctly.
     $this->assertRaw('<h2>' . t('Empty section') . '</h2>');
-    $this->assertRaw('<p>' . t('This description should appear.'), '</p>');
+    $this->assertRaw('<p>' . t('This description should appear.') . '</p>');
     $this->assertText(t('There is currently nothing in this section.'));
 
     // Make sure links are properly added for modules implementing hook_help().
diff --git a/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php b/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php
index 394fd4d7700..8d1e4ef7929 100644
--- a/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php
+++ b/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php
@@ -338,7 +338,7 @@ class ImageAdminStylesTest extends ImageFieldTestBase {
 
     // Test that image is displayed using newly created style.
     $this->drupalGet('node/' . $nid);
-    $this->assertRaw(file_url_transform_relative($style->buildUrl($original_uri)), new FormattableMarkup('Image displayed using style @style.', ['@style' => $style_name]));
+    $this->assertRaw(file_url_transform_relative($style->buildUrl($original_uri)));
 
     // Rename the style and make sure the image field is updated.
     $new_style_name = strtolower($this->randomMachineName(10));
@@ -353,7 +353,7 @@ class ImageAdminStylesTest extends ImageFieldTestBase {
 
     // Reload the image style using the new name.
     $style = ImageStyle::load($new_style_name);
-    $this->assertRaw(file_url_transform_relative($style->buildUrl($original_uri)), 'Image displayed using style replacement style.');
+    $this->assertRaw(file_url_transform_relative($style->buildUrl($original_uri)));
 
     // Delete the style and choose a replacement style.
     $edit = [
@@ -365,7 +365,7 @@ class ImageAdminStylesTest extends ImageFieldTestBase {
 
     $replacement_style = ImageStyle::load('thumbnail');
     $this->drupalGet('node/' . $nid);
-    $this->assertRaw(file_url_transform_relative($replacement_style->buildUrl($original_uri)), 'Image displayed using style replacement style.');
+    $this->assertRaw(file_url_transform_relative($replacement_style->buildUrl($original_uri)));
   }
 
   /**
@@ -484,7 +484,7 @@ class ImageAdminStylesTest extends ImageFieldTestBase {
 
     // Test that image is displayed using newly created style.
     $this->drupalGet('node/' . $nid);
-    $this->assertRaw(file_url_transform_relative($style->buildUrl($original_uri)), new FormattableMarkup('Image displayed using style @style.', ['@style' => $style_name]));
+    $this->assertRaw(file_url_transform_relative($style->buildUrl($original_uri)));
 
     // Copy config to sync, and delete the image style.
     $sync = $this->container->get('config.storage.sync');
diff --git a/core/modules/image/tests/src/Functional/ImageFieldDisplayTest.php b/core/modules/image/tests/src/Functional/ImageFieldDisplayTest.php
index 568db12d0f7..d3a6a8b2fed 100644
--- a/core/modules/image/tests/src/Functional/ImageFieldDisplayTest.php
+++ b/core/modules/image/tests/src/Functional/ImageFieldDisplayTest.php
@@ -117,7 +117,7 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
       '#alt' => $alt,
     ];
     $default_output = str_replace("\n", NULL, $renderer->renderRoot($image));
-    $this->assertRaw($default_output, 'Default formatter displaying correctly on full node view.');
+    $this->assertRaw($default_output);
 
     // Test the image linked to file formatter.
     $display_options = [
@@ -143,7 +143,7 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
     $this->assertCacheContext('url.site');
     // Verify that no image style cache tags are found.
     $this->assertSession()->responseHeaderNotContains('X-Drupal-Cache-Tags', 'image_style:');
-    $this->assertRaw($default_output, 'Image linked to file formatter displaying correctly on full node view.');
+    $this->assertRaw($default_output);
     // Verify that the image can be downloaded.
     $this->assertEqual(file_get_contents($test_image->uri), $this->drupalGet(file_create_url($image_uri)), 'File was downloaded successfully.');
     if ($scheme == 'private') {
@@ -208,7 +208,7 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
     $this->drupalGet('node/' . $nid);
     $image_style = ImageStyle::load('thumbnail');
     $this->assertSession()->responseHeaderContains('X-Drupal-Cache-Tags', $image_style->getCacheTags()[0]);
-    $this->assertRaw($default_output, 'Image style thumbnail formatter displaying correctly on full node view.');
+    $this->assertRaw($default_output);
 
     if ($scheme == 'private') {
       // Log out and ensure the file cannot be accessed.
@@ -304,7 +304,7 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
     ];
     $this->drupalPostForm('node/' . $nid . '/edit', $edit, t('Save'));
     $default_output = str_replace("\n", NULL, $renderer->renderRoot($image));
-    $this->assertRaw($default_output, 'Image displayed using user supplied alt and title attributes.');
+    $this->assertRaw($default_output);
 
     // Verify that alt/title longer than allowed results in a validation error.
     $test_size = 2000;
@@ -401,7 +401,7 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
     $this->assertSession()->responseHeaderContains('X-Drupal-Cache-Tags', $file->getCacheTags()[0]);
     // Verify that no image style cache tags are found.
     $this->assertSession()->responseHeaderNotContains('X-Drupal-Cache-Tags', 'image_style:');
-    $this->assertRaw($default_output, 'Default image displayed when no user supplied image is present.');
+    $this->assertRaw($default_output);
 
     // Create a node with an image attached and ensure that the default image
     // is not displayed.
@@ -426,8 +426,10 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
     $this->assertSession()->responseHeaderContains('X-Drupal-Cache-Tags', $file->getCacheTags()[0]);
     // Verify that no image style cache tags are found.
     $this->assertSession()->responseHeaderNotContains('X-Drupal-Cache-Tags', 'image_style:');
-    $this->assertNoRaw($default_output, 'Default image is not displayed when user supplied image is present.');
-    $this->assertRaw($image_output, 'User supplied image is displayed.');
+    // Default image should not be displayed.
+    $this->assertNoRaw($default_output);
+    // User supplied image should be displayed.
+    $this->assertRaw($image_output);
 
     // Remove default image from the field and make sure it is no longer used.
     // Can't use fillField cause Mink can't fill hidden fields.
@@ -477,7 +479,9 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
     $this->assertSession()->responseHeaderContains('X-Drupal-Cache-Tags', $file->getCacheTags()[0]);
     // Verify that no image style cache tags are found.
     $this->assertSession()->responseHeaderNotContains('X-Drupal-Cache-Tags', 'image_style:');
-    $this->assertRaw($default_output, 'Default private image displayed when no user supplied image is present.');
+    // Default private image should be displayed when no user supplied image
+    // is present.
+    $this->assertRaw($default_output);
   }
 
 }
diff --git a/core/modules/language/tests/src/Functional/LanguageBrowserDetectionTest.php b/core/modules/language/tests/src/Functional/LanguageBrowserDetectionTest.php
index 9d66dc69c15..c926f1e32f0 100644
--- a/core/modules/language/tests/src/Functional/LanguageBrowserDetectionTest.php
+++ b/core/modules/language/tests/src/Functional/LanguageBrowserDetectionTest.php
@@ -56,7 +56,7 @@ class LanguageBrowserDetectionTest extends BrowserTestBase {
     $t_args = [
       '%browser' => $browser_langcode,
     ];
-    $this->assertRaw(t('The mapping for the %browser browser language code has been deleted.', $t_args), 'The test browser language code has been deleted.');
+    $this->assertRaw(t('The mapping for the %browser browser language code has been deleted.', $t_args));
 
     // Check we went back to the browser negotiation mapping overview.
     $this->assertSession()->addressEquals(Url::fromRoute('language.negotiation_browser'));
diff --git a/core/modules/language/tests/src/Functional/LanguageListTest.php b/core/modules/language/tests/src/Functional/LanguageListTest.php
index 778e6e56283..4449d5fd325 100644
--- a/core/modules/language/tests/src/Functional/LanguageListTest.php
+++ b/core/modules/language/tests/src/Functional/LanguageListTest.php
@@ -70,7 +70,7 @@ class LanguageListTest extends BrowserTestBase {
     ];
     $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add custom language'));
     $this->assertSession()->addressEquals(Url::fromRoute('entity.configurable_language.collection'));
-    $this->assertRaw('"edit-languages-' . $langcode . '-weight"', 'Language code found.');
+    $this->assertRaw('"edit-languages-' . $langcode . '-weight"');
     $this->assertText(t($name), 'Test language added.');
 
     $language = \Drupal::service('language_manager')->getLanguage($langcode);
@@ -103,7 +103,7 @@ class LanguageListTest extends BrowserTestBase {
       'label' => $name,
     ];
     $this->drupalPostForm('admin/config/regional/language/edit/' . $langcode, $edit, t('Save language'));
-    $this->assertRaw($name, 'The language has been updated.');
+    $this->assertRaw($name);
     $this->assertSession()->addressEquals(Url::fromRoute('entity.configurable_language.collection', [], ['language' => $language]));
 
     // Change back the default language.
@@ -121,13 +121,13 @@ class LanguageListTest extends BrowserTestBase {
     // First test the 'cancel' link.
     $this->clickLink(t('Cancel'));
     $this->assertSession()->addressEquals(Url::fromRoute('entity.configurable_language.collection', [], ['language' => $english]));
-    $this->assertRaw($name, 'The language was not deleted.');
+    $this->assertRaw($name);
     // Delete the language for real. This a confirm form, we do not need any
     // fields changed.
     $this->drupalPostForm('admin/config/regional/language/delete/' . $langcode, [], t('Delete'));
     // We need raw here because %language and %langcode will add HTML.
     $t_args = ['%language' => $name, '%langcode' => $langcode];
-    $this->assertRaw(t('The %language (%langcode) language has been removed.', $t_args), 'The test language has been removed.');
+    $this->assertRaw(t('The %language (%langcode) language has been removed.', $t_args));
     $this->assertSession()->addressEquals(Url::fromRoute('entity.configurable_language.collection', [], ['language' => $english]));
     // Verify that language is no longer found.
     $this->drupalGet('admin/config/regional/language/delete/' . $langcode);
@@ -139,7 +139,7 @@ class LanguageListTest extends BrowserTestBase {
     $this->rebuildContainer();
     // We need raw here because %language and %langcode will add HTML.
     $t_args = ['%language' => 'French', '%langcode' => 'fr'];
-    $this->assertRaw(t('The %language (%langcode) language has been removed.', $t_args), 'The French language has been removed.');
+    $this->assertRaw(t('The %language (%langcode) language has been removed.', $t_args));
     $this->assertSession()->addressEquals(Url::fromRoute('entity.configurable_language.collection'));
     // Verify that language is no longer found.
     $this->drupalGet('admin/config/regional/language/delete/fr');
@@ -177,7 +177,7 @@ class LanguageListTest extends BrowserTestBase {
     $this->drupalPostForm('admin/config/regional/language/delete/en', [], t('Delete'));
     // We need raw here because %language and %langcode will add HTML.
     $t_args = ['%language' => 'English', '%langcode' => 'en'];
-    $this->assertRaw(t('The %language (%langcode) language has been removed.', $t_args), 'The English language has been removed.');
+    $this->assertRaw(t('The %language (%langcode) language has been removed.', $t_args));
     $this->rebuildContainer();
 
     // Ensure we can't delete a locked language.
diff --git a/core/modules/language/tests/src/Functional/LanguageNegotiationInfoTest.php b/core/modules/language/tests/src/Functional/LanguageNegotiationInfoTest.php
index 2a3c5d9c695..2deb282df0d 100644
--- a/core/modules/language/tests/src/Functional/LanguageNegotiationInfoTest.php
+++ b/core/modules/language/tests/src/Functional/LanguageNegotiationInfoTest.php
@@ -159,8 +159,8 @@ class LanguageNegotiationInfoTest extends BrowserTestBase {
     $this->assertFalse(isset($negotiation[$test_method_id]), 'The disabled test language negotiation method is not part of the content language negotiation settings.');
 
     // Check that configuration page presents the correct options and settings.
-    $this->assertNoRaw(t('Test language detection'), 'No test language type configuration available.');
-    $this->assertNoRaw(t('This is a test language negotiation method'), 'No test language negotiation method available.');
+    $this->assertNoRaw(t('Test language detection'));
+    $this->assertNoRaw(t('This is a test language negotiation method'));
   }
 
   /**
diff --git a/core/modules/language/tests/src/Functional/LanguageUrlRewritingTest.php b/core/modules/language/tests/src/Functional/LanguageUrlRewritingTest.php
index 22eeaadb61a..399425379c7 100644
--- a/core/modules/language/tests/src/Functional/LanguageUrlRewritingTest.php
+++ b/core/modules/language/tests/src/Functional/LanguageUrlRewritingTest.php
@@ -56,7 +56,7 @@ class LanguageUrlRewritingTest extends BrowserTestBase {
 
     // Check that drupalSettings contains path prefix.
     $this->drupalGet('fr/admin/config/regional/language/detection');
-    $this->assertRaw('"pathPrefix":"fr\/"', 'drupalSettings path prefix contains language code.');
+    $this->assertRaw('"pathPrefix":"fr\/"');
   }
 
   /**
diff --git a/core/modules/locale/tests/src/Functional/LocaleContentTest.php b/core/modules/locale/tests/src/Functional/LocaleContentTest.php
index 9f93136c0dc..0e5352842ba 100644
--- a/core/modules/locale/tests/src/Functional/LocaleContentTest.php
+++ b/core/modules/locale/tests/src/Functional/LocaleContentTest.php
@@ -131,7 +131,7 @@ class LocaleContentTest extends BrowserTestBase {
     // Edit the content and ensure correct language is selected.
     $path = 'node/' . $node->id() . '/edit';
     $this->drupalGet($path);
-    $this->assertRaw('<option value="' . $langcode . '" selected="selected">' . $name . '</option>', 'Correct language selected.');
+    $this->assertRaw('<option value="' . $langcode . '" selected="selected">' . $name . '</option>');
     // Ensure we can change the node language.
     $edit = [
       'langcode[0][value]' => 'en',
diff --git a/core/modules/locale/tests/src/Functional/LocaleExportTest.php b/core/modules/locale/tests/src/Functional/LocaleExportTest.php
index 0088c29512a..e6412c38538 100644
--- a/core/modules/locale/tests/src/Functional/LocaleExportTest.php
+++ b/core/modules/locale/tests/src/Functional/LocaleExportTest.php
@@ -68,9 +68,9 @@ class LocaleExportTest extends BrowserTestBase {
     ], t('Export'));
 
     // Ensure we have a translation file.
-    $this->assertRaw('# French translation of Drupal', 'Exported French translation file.');
+    $this->assertRaw('# French translation of Drupal');
     // Ensure our imported translations exist in the file.
-    $this->assertRaw('msgstr "lundi"', 'French translations present in exported file.');
+    $this->assertRaw('msgstr "lundi"');
 
     // Import some more French translations which will be marked as customized.
     $name = $file_system->tempnam('temporary://', "po2_") . '.po';
@@ -98,11 +98,11 @@ class LocaleExportTest extends BrowserTestBase {
     ], t('Export'));
 
     // Ensure we have a translation file.
-    $this->assertRaw('# French translation of Drupal', 'Exported French translation file with only customized strings.');
+    $this->assertRaw('# French translation of Drupal');
     // Ensure the customized translations exist in the file.
-    $this->assertRaw('msgstr "janvier"', 'French custom translation present in exported file.');
+    $this->assertRaw('msgstr "janvier"');
     // Ensure no untranslated strings exist in the file.
-    $this->assertNoRaw('msgid "February"', 'Untranslated string not present in exported file.');
+    $this->assertNoRaw('msgid "February"');
 
     // Export only untranslated French translations.
     $this->drupalPostForm('admin/config/regional/translate/export', [
@@ -113,11 +113,11 @@ class LocaleExportTest extends BrowserTestBase {
     ], t('Export'));
 
     // Ensure we have a translation file.
-    $this->assertRaw('# French translation of Drupal', 'Exported French translation file with only untranslated strings.');
+    $this->assertRaw('# French translation of Drupal');
     // Ensure no customized translations exist in the file.
-    $this->assertNoRaw('msgstr "janvier"', 'French custom translation not present in exported file.');
+    $this->assertNoRaw('msgstr "janvier"');
     // Ensure the untranslated strings exist in the file, and with right quotes.
-    $this->assertRaw($this->getUntranslatedString(), 'Empty string present in exported file.');
+    $this->assertRaw($this->getUntranslatedString());
   }
 
   /**
@@ -131,7 +131,7 @@ class LocaleExportTest extends BrowserTestBase {
     // Get the translation template file.
     $this->drupalPostForm('admin/config/regional/translate/export', [], t('Export'));
     // Ensure we have a translation file.
-    $this->assertRaw('# LANGUAGE translation of PROJECT', 'Exported translation template file.');
+    $this->assertRaw('# LANGUAGE translation of PROJECT');
   }
 
   /**
diff --git a/core/modules/locale/tests/src/Functional/LocaleImportFunctionalTest.php b/core/modules/locale/tests/src/Functional/LocaleImportFunctionalTest.php
index 10c03f97e09..544ce7dfdbc 100644
--- a/core/modules/locale/tests/src/Functional/LocaleImportFunctionalTest.php
+++ b/core/modules/locale/tests/src/Functional/LocaleImportFunctionalTest.php
@@ -86,10 +86,10 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
     ]);
     $this->config('locale.settings');
     // The import should automatically create the corresponding language.
-    $this->assertRaw(t('The language %language has been created.', ['%language' => 'French']), 'The language has been automatically created.');
+    $this->assertRaw(t('The language %language has been created.', ['%language' => 'French']));
 
     // The import should have created 8 strings.
-    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 8, '%update' => 0, '%delete' => 0]), 'The translation file was successfully imported.');
+    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 8, '%update' => 0, '%delete' => 0]));
 
     // This import should have saved plural forms to have 2 variants.
     $locale_plurals = \Drupal::service('locale.plural.formula')->getNumberOfPlurals('fr');
@@ -104,10 +104,10 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
     ]);
 
     // The import should have created 1 string and rejected 2.
-    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 1, '%update' => 0, '%delete' => 0]), 'The translation file was successfully imported.');
+    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 1, '%update' => 0, '%delete' => 0]));
 
     $skip_message = \Drupal::translation()->formatPlural(2, 'One translation string was skipped because of disallowed or malformed HTML. <a href=":url">See the log</a> for details.', '@count translation strings were skipped because of disallowed or malformed HTML. See the log for details.', [':url' => Url::fromRoute('dblog.overview')->toString()]);
-    $this->assertRaw($skip_message, 'Unsafe strings were skipped.');
+    $this->assertRaw($skip_message);
 
     // Repeat the process with a user that can access site reports, and this
     // time the different warnings must contain links to the log.
@@ -119,7 +119,7 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
     ]);
 
     $skip_message = \Drupal::translation()->formatPlural(2, 'One translation string was skipped because of disallowed or malformed HTML. <a href=":url">See the log</a> for details.', '@count translation strings were skipped because of disallowed or malformed HTML. <a href=":url">See the log</a> for details.', [':url' => Url::fromRoute('dblog.overview')->toString()]);
-    $this->assertRaw($skip_message, 'Unsafe strings were skipped.');
+    $this->assertRaw($skip_message);
 
     // Check empty files import with a user that cannot access site reports..
     $this->drupalLogin($this->adminUser);
@@ -128,7 +128,7 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
       'langcode' => 'fr',
     ]);
     // The import should have created 0 string and rejected 0.
-    $this->assertRaw(t('One translation file could not be imported. See the log for details.'), 'The empty translation file import reported no translations imported.');
+    $this->assertRaw(t('One translation file could not be imported. See the log for details.'));
 
     // Repeat the process with a user that can access site reports, and this
     // time the different warnings must contain links to the log.
@@ -138,7 +138,7 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
       'langcode' => 'fr',
     ]);
     // The import should have created 0 string and rejected 0.
-    $this->assertRaw(t('One translation file could not be imported. <a href=":url">See the log</a> for details.', [':url' => Url::fromRoute('dblog.overview')->toString()]), 'The empty translation file import reported no translations imported.');
+    $this->assertRaw(t('One translation file could not be imported. <a href=":url">See the log</a> for details.', [':url' => Url::fromRoute('dblog.overview')->toString()]));
 
     // Try importing a .po file which doesn't exist.
     $name = $this->randomMachineName(16);
@@ -156,7 +156,7 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
     ]);
 
     // The import should have created 1 string.
-    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 1, '%update' => 0, '%delete' => 0]), 'The translation file was successfully imported.');
+    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 1, '%update' => 0, '%delete' => 0]));
     // Ensure string wasn't overwritten.
     $search = [
       'string' => 'Montag',
@@ -178,7 +178,7 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
     ]);
 
     // The import should have updated 2 strings.
-    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 0, '%update' => 2, '%delete' => 0]), 'The translation file was successfully imported.');
+    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 0, '%update' => 2, '%delete' => 0]));
     // Ensure string was overwritten.
     $search = [
       'string' => 'Montag',
@@ -198,7 +198,7 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
     ]);
 
     // The import should have created 6 strings.
-    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 6, '%update' => 0, '%delete' => 0]), 'The customized translation file was successfully imported.');
+    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 6, '%update' => 0, '%delete' => 0]));
 
     // The database should now contain 6 customized strings (two imported
     // strings are not translated).
@@ -218,7 +218,7 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
     ]);
 
     // The import should have created 1 string.
-    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 1, '%update' => 0, '%delete' => 0]), 'The customized translation file was successfully imported.');
+    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 1, '%update' => 0, '%delete' => 0]));
     // Ensure string wasn't overwritten.
     $search = [
       'string' => 'januari',
@@ -237,7 +237,7 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
     ]);
 
     // The import should have updated 2 strings.
-    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 0, '%update' => 2, '%delete' => 0]), 'The customized translation file was successfully imported.');
+    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 0, '%update' => 2, '%delete' => 0]));
     // Ensure string was overwritten.
     $search = [
       'string' => 'januari',
@@ -275,7 +275,7 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
       'langcode' => $langcode,
     ]);
 
-    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 1, '%update' => 0, '%delete' => 0]), 'The translation file was successfully imported.');
+    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 1, '%update' => 0, '%delete' => 0]));
     $this->assertIdentical((string) t('Operations', [], ['langcode' => $langcode]), 'Műveletek', 'String imported and translated.');
 
     // Try importing a .po file.
@@ -283,7 +283,7 @@ class LocaleImportFunctionalTest extends BrowserTestBase {
       'langcode' => $langcode,
       'overwrite_options[not_customized]' => TRUE,
     ]);
-    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 0, '%update' => 0, '%delete' => 1]), 'The translation file was successfully imported.');
+    $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.', ['%number' => 0, '%update' => 0, '%delete' => 1]));
 
     $str = "Operations";
     $search = [
diff --git a/core/modules/locale/tests/src/Functional/LocalePluralFormatTest.php b/core/modules/locale/tests/src/Functional/LocalePluralFormatTest.php
index 9a6428ed9a5..fad503dc383 100644
--- a/core/modules/locale/tests/src/Functional/LocalePluralFormatTest.php
+++ b/core/modules/locale/tests/src/Functional/LocalePluralFormatTest.php
@@ -246,22 +246,22 @@ class LocalePluralFormatTest extends BrowserTestBase {
       'langcode' => 'fr',
     ], t('Export'));
     // Ensure we have a translation file.
-    $this->assertRaw('# French translation of Drupal', 'Exported French translation file.');
+    $this->assertRaw('# French translation of Drupal');
     // Ensure our imported translations exist in the file.
-    $this->assertRaw("msgid \"Monday\"\nmsgstr \"lundi\"", 'French translations present in exported file.');
+    $this->assertRaw("msgid \"Monday\"\nmsgstr \"lundi\"");
     // Check for plural export specifically.
-    $this->assertRaw("msgid \"1 hour\"\nmsgid_plural \"@count hours\"\nmsgstr[0] \"@count heure\"\nmsgstr[1] \"@count heures\"", 'Plural translations exported properly.');
+    $this->assertRaw("msgid \"1 hour\"\nmsgid_plural \"@count hours\"\nmsgstr[0] \"@count heure\"\nmsgstr[1] \"@count heures\"");
 
     // Get the Croatian translations.
     $this->drupalPostForm('admin/config/regional/translate/export', [
       'langcode' => 'hr',
     ], t('Export'));
     // Ensure we have a translation file.
-    $this->assertRaw('# Croatian translation of Drupal', 'Exported Croatian translation file.');
+    $this->assertRaw('# Croatian translation of Drupal');
     // Ensure our imported translations exist in the file.
-    $this->assertRaw("msgid \"Monday\"\nmsgstr \"Ponedjeljak\"", 'Croatian translations present in exported file.');
+    $this->assertRaw("msgid \"Monday\"\nmsgstr \"Ponedjeljak\"");
     // Check for plural export specifically.
-    $this->assertRaw("msgid \"1 hour\"\nmsgid_plural \"@count hours\"\nmsgstr[0] \"@count sat\"\nmsgstr[1] \"@count sata\"\nmsgstr[2] \"@count sati\"", 'Plural translations exported properly.');
+    $this->assertRaw("msgid \"1 hour\"\nmsgid_plural \"@count hours\"\nmsgstr[0] \"@count sat\"\nmsgstr[1] \"@count sata\"\nmsgstr[2] \"@count sati\"");
 
     // Check if the source appears on the translation page.
     $this->drupalGet('admin/config/regional/translate');
@@ -357,16 +357,16 @@ class LocalePluralFormatTest extends BrowserTestBase {
       'langcode' => 'fr',
     ], t('Export'));
     // Check for plural export specifically.
-    $this->assertRaw("msgid \"1 hour\"\nmsgid_plural \"@count hours\"\nmsgstr[0] \"@count heure edited\"\nmsgstr[1] \"@count heures\"", 'Edited French plural translations for hours exported properly.');
-    $this->assertRaw("msgid \"1 day\"\nmsgid_plural \"@count days\"\nmsgstr[0] \"1 jour\"\nmsgstr[1] \"@count jours\"", 'Added French plural translations for days exported properly.');
+    $this->assertRaw("msgid \"1 hour\"\nmsgid_plural \"@count hours\"\nmsgstr[0] \"@count heure edited\"\nmsgstr[1] \"@count heures\"");
+    $this->assertRaw("msgid \"1 day\"\nmsgid_plural \"@count days\"\nmsgstr[0] \"1 jour\"\nmsgstr[1] \"@count jours\"");
 
     // Get the Croatian translations.
     $this->drupalPostForm('admin/config/regional/translate/export', [
       'langcode' => 'hr',
     ], t('Export'));
     // Check for plural export specifically.
-    $this->assertRaw("msgid \"1 hour\"\nmsgid_plural \"@count hours\"\nmsgstr[0] \"@count sat\"\nmsgstr[1] \"@count sata edited\"\nmsgstr[2] \"@count sati\"", 'Edited Croatian plural translations exported properly.');
-    $this->assertRaw("msgid \"1 day\"\nmsgid_plural \"@count days\"\nmsgstr[0] \"@count dan\"\nmsgstr[1] \"@count dana\"\nmsgstr[2] \"@count dana\"", 'Added Croatian plural translations exported properly.');
+    $this->assertRaw("msgid \"1 hour\"\nmsgid_plural \"@count hours\"\nmsgstr[0] \"@count sat\"\nmsgstr[1] \"@count sata edited\"\nmsgstr[2] \"@count sati\"");
+    $this->assertRaw("msgid \"1 day\"\nmsgid_plural \"@count days\"\nmsgstr[0] \"@count dan\"\nmsgstr[1] \"@count dana\"\nmsgstr[2] \"@count dana\"");
   }
 
   /**
diff --git a/core/modules/locale/tests/src/Functional/LocaleTranslatedSchemaDefinitionTest.php b/core/modules/locale/tests/src/Functional/LocaleTranslatedSchemaDefinitionTest.php
index 816b158a20b..778ee34cae9 100644
--- a/core/modules/locale/tests/src/Functional/LocaleTranslatedSchemaDefinitionTest.php
+++ b/core/modules/locale/tests/src/Functional/LocaleTranslatedSchemaDefinitionTest.php
@@ -93,7 +93,7 @@ class LocaleTranslatedSchemaDefinitionTest extends BrowserTestBase {
     $this->drupalGet($update_url . '/selection', ['external' => TRUE]);
     $this->updateRequirementsProblem();
     $this->drupalGet($update_url . '/selection', ['external' => TRUE]);
-    $this->assertRaw('messages--status', 'No pending updates.');
+    $this->assertRaw('messages--status');
     $this->assertSession()->linkByHrefNotExists('fr/update.php/run', 'No link to run updates.');
   }
 
diff --git a/core/modules/locale/tests/src/Functional/LocaleTranslationUiTest.php b/core/modules/locale/tests/src/Functional/LocaleTranslationUiTest.php
index 832527774ca..c0c0654c5d4 100644
--- a/core/modules/locale/tests/src/Functional/LocaleTranslationUiTest.php
+++ b/core/modules/locale/tests/src/Functional/LocaleTranslationUiTest.php
@@ -77,7 +77,7 @@ class LocaleTranslationUiTest extends BrowserTestBase {
     t($name, [], ['langcode' => $langcode])->render();
     // Reset locale cache.
     $this->container->get('string_translation')->reset();
-    $this->assertRaw('"edit-languages-' . $langcode . '-weight"', 'Language code found.');
+    $this->assertRaw('"edit-languages-' . $langcode . '-weight"');
     $this->assertText(t($name), 'Test language added.');
     $this->drupalLogout();
 
@@ -119,7 +119,7 @@ class LocaleTranslationUiTest extends BrowserTestBase {
       'translation' => 'translated',
     ];
     $this->drupalPostForm('admin/config/regional/translate', $search, t('Filter'));
-    $this->assertRaw($translation, 'Non-English translation properly saved.');
+    $this->assertRaw($translation);
 
     $search = [
       'string' => $name,
@@ -139,7 +139,7 @@ class LocaleTranslationUiTest extends BrowserTestBase {
       'translation' => 'translated',
     ];
     $this->drupalPostForm('admin/config/regional/translate', $search, t('Filter'));
-    $this->assertRaw($translation_to_en, 'English translation properly saved.');
+    $this->assertRaw($translation_to_en);
 
     $this->assertTrue($name != $translation && t($name, [], ['langcode' => $langcode]) == $translation, 't() works for non-English.');
     // Refresh the locale() cache to get fresh data from t() below. We are in
@@ -188,7 +188,7 @@ class LocaleTranslationUiTest extends BrowserTestBase {
     $this->drupalPostForm($path, [], t('Delete'));
     // We need raw here because %language and %langcode will add HTML.
     $t_args = ['%language' => $name, '%langcode' => $langcode];
-    $this->assertRaw(t('The %language (%langcode) language has been removed.', $t_args), 'The test language has been removed.');
+    $this->assertRaw(t('The %language (%langcode) language has been removed.', $t_args));
     // Reload to remove $name.
     $this->drupalGet($path);
     // Verify that language is no longer found.
@@ -210,7 +210,7 @@ class LocaleTranslationUiTest extends BrowserTestBase {
       $lid => '',
     ];
     $this->drupalPostForm('admin/config/regional/translate', $edit, t('Save translations'));
-    $this->assertRaw($name, 'The strings have been saved.');
+    $this->assertRaw($name);
     $this->drupalLogin($translate_user);
     $search = [
       'string' => $name,
diff --git a/core/modules/locale/tests/src/Functional/LocaleUpdateInterfaceTest.php b/core/modules/locale/tests/src/Functional/LocaleUpdateInterfaceTest.php
index af153867795..54f1ceb6427 100644
--- a/core/modules/locale/tests/src/Functional/LocaleUpdateInterfaceTest.php
+++ b/core/modules/locale/tests/src/Functional/LocaleUpdateInterfaceTest.php
@@ -52,7 +52,7 @@ class LocaleUpdateInterfaceTest extends LocaleUpdateBase {
     $this->assertNoText('Translation update status', 'No status message');
 
     $this->drupalGet('admin/reports/translations');
-    $this->assertRaw(t('No translatable languages available. <a href=":add_language">Add a language</a> first.', [':add_language' => Url::fromRoute('entity.configurable_language.collection')->toString()]), 'Language message');
+    $this->assertRaw(t('No translatable languages available. <a href=":add_language">Add a language</a> first.', [':add_language' => Url::fromRoute('entity.configurable_language.collection')->toString()]));
 
     // Add German language.
     $this->addLanguage('de');
@@ -77,7 +77,7 @@ class LocaleUpdateInterfaceTest extends LocaleUpdateBase {
     // Check if updates are available for German.
     $this->drupalGet('admin/reports/status');
     $this->assertText(t('Translation update status'), 'Status message');
-    $this->assertRaw(t('Updates available for: @languages. See the <a href=":updates">Available translation updates</a> page for more information.', ['@languages' => t('German'), ':updates' => Url::fromRoute('locale.translate_status')->toString()]), 'Updates available message');
+    $this->assertRaw(t('Updates available for: @languages. See the <a href=":updates">Available translation updates</a> page for more information.', ['@languages' => t('German'), ':updates' => Url::fromRoute('locale.translate_status')->toString()]));
     $this->drupalGet('admin/reports/translations');
     $this->assertText(t('Updates for: @modules', ['@modules' => 'Locale test translate']), 'Translations available');
 
@@ -91,7 +91,7 @@ class LocaleUpdateInterfaceTest extends LocaleUpdateBase {
     // Check if no updates were found.
     $this->drupalGet('admin/reports/status');
     $this->assertText(t('Translation update status'), 'Status message');
-    $this->assertRaw(t('Missing translations for: @languages. See the <a href=":updates">Available translation updates</a> page for more information.', ['@languages' => t('German'), ':updates' => Url::fromRoute('locale.translate_status')->toString()]), 'Missing translations message');
+    $this->assertRaw(t('Missing translations for: @languages. See the <a href=":updates">Available translation updates</a> page for more information.', ['@languages' => t('German'), ':updates' => Url::fromRoute('locale.translate_status')->toString()]));
     $this->drupalGet('admin/reports/translations');
     $this->assertText(t('Missing translations for one project'), 'No translations found');
     $release_details = new FormattableMarkup('@module (@version). @info', [
@@ -99,7 +99,7 @@ class LocaleUpdateInterfaceTest extends LocaleUpdateBase {
       '@version' => '1.3-dev',
       '@info' => t('File not found at %local_path', ['%local_path' => 'core/modules/locale/tests/test.de.po']),
     ]);
-    $this->assertRaw($release_details->__toString(), 'Release details');
+    $this->assertRaw($release_details->__toString());
 
     // Override Drupal core translation status as 'no translations found'.
     $status = locale_translation_get_status();
diff --git a/core/modules/locale/tests/src/Functional/LocaleUpdateTest.php b/core/modules/locale/tests/src/Functional/LocaleUpdateTest.php
index 46c7349817d..fd28eaa3274 100644
--- a/core/modules/locale/tests/src/Functional/LocaleUpdateTest.php
+++ b/core/modules/locale/tests/src/Functional/LocaleUpdateTest.php
@@ -127,7 +127,7 @@ class LocaleUpdateTest extends LocaleUpdateBase {
     $this->drupalGet('admin/reports/translations/check');
 
     // Check the status on the Available translation status page.
-    $this->assertRaw('<label for="edit-langcodes-de" class="visually-hidden">Update German</label>', 'German language found');
+    $this->assertRaw('<label for="edit-langcodes-de" class="visually-hidden">Update German</label>');
     $this->assertText('Updates for: Contributed module one, Contributed module two, Custom module one, Locale test', 'Updates found');
     /** @var \Drupal\Core\Datetime\DateFormatterInterface $date_formatter */
     $date_formatter = $this->container->get('date.formatter');
@@ -317,7 +317,7 @@ class LocaleUpdateTest extends LocaleUpdateBase {
 
     // Check if translations have been imported.
     $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.',
-      ['%number' => 7, '%update' => 0, '%delete' => 0]), 'One translation file imported.');
+      ['%number' => 7, '%update' => 0, '%delete' => 0]));
     // cSpell:disable-next-line
     $this->assertTranslation('Tuesday', 'Dienstag', 'de');
 
@@ -364,7 +364,7 @@ class LocaleUpdateTest extends LocaleUpdateBase {
 
     // Check if the right number of translations are added.
     $this->assertRaw(t('One translation file imported. %number translations were added, %update translations were updated and %delete translations were removed.',
-      ['%number' => 8, '%update' => 0, '%delete' => 0]), 'One language added.');
+      ['%number' => 8, '%update' => 0, '%delete' => 0]));
     // cSpell:disable-next-line
     $this->assertTranslation('Extraday', 'extra dag', 'nl');
 
diff --git a/core/modules/menu_link_content/tests/src/Functional/MenuLinkContentTranslationUITest.php b/core/modules/menu_link_content/tests/src/Functional/MenuLinkContentTranslationUITest.php
index 231deba2395..20eeb7a1132 100644
--- a/core/modules/menu_link_content/tests/src/Functional/MenuLinkContentTranslationUITest.php
+++ b/core/modules/menu_link_content/tests/src/Functional/MenuLinkContentTranslationUITest.php
@@ -97,10 +97,12 @@ class MenuLinkContentTranslationUITest extends ContentTranslationUITestBase {
     $edit = [];
     $edit['admin_theme'] = 'seven';
     $this->drupalPostForm('admin/appearance', $edit, t('Save configuration'));
+    // Check that edit uses the admin theme.
     $this->drupalGet('admin/structure/menu/item/' . $entityId . '/edit');
-    $this->assertRaw('core/themes/seven/css/base/elements.css', 'Edit uses admin theme.');
+    $this->assertRaw('core/themes/seven/css/base/elements.css');
+    // Check that translation uses admin theme as well.
     $this->drupalGet('admin/structure/menu/item/' . $entityId . '/edit/translations');
-    $this->assertRaw('core/themes/seven/css/base/elements.css', 'Translation uses admin theme as well.');
+    $this->assertRaw('core/themes/seven/css/base/elements.css');
   }
 
   /**
diff --git a/core/modules/menu_ui/tests/src/Functional/MenuUiTest.php b/core/modules/menu_ui/tests/src/Functional/MenuUiTest.php
index 905a82e4a50..b3048a06c6a 100644
--- a/core/modules/menu_ui/tests/src/Functional/MenuUiTest.php
+++ b/core/modules/menu_ui/tests/src/Functional/MenuUiTest.php
@@ -185,14 +185,14 @@ class MenuUiTest extends BrowserTestBase {
 
     // Assert the new menu.
     $this->drupalGet('admin/structure/menu/manage/' . $menu_name);
-    $this->assertRaw($label, 'Custom menu was added.');
+    $this->assertRaw($label);
 
     // Edit the menu.
     $new_label = $this->randomMachineName(16);
     $menu->set('label', $new_label);
     $menu->save();
     $this->drupalGet('admin/structure/menu/manage/' . $menu_name);
-    $this->assertRaw($new_label, 'Custom menu was edited.');
+    $this->assertRaw($new_label);
   }
 
   /**
@@ -261,7 +261,7 @@ class MenuUiTest extends BrowserTestBase {
     // Delete custom menu.
     $this->drupalPostForm("admin/structure/menu/manage/$menu_name/delete", [], t('Delete'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('The menu %title has been deleted.', ['%title' => $label]), 'Custom menu was deleted');
+    $this->assertRaw(t('The menu %title has been deleted.', ['%title' => $label]));
     $this->assertNull(Menu::load($menu_name), 'Custom menu was deleted');
     // Test if all menu links associated with the menu were removed from
     // database.
@@ -270,7 +270,7 @@ class MenuUiTest extends BrowserTestBase {
 
     // Make sure there's no delete button on system menus.
     $this->drupalGet('admin/structure/menu/manage/main');
-    $this->assertNoRaw('edit-delete', 'The delete button was not found');
+    $this->assertNoRaw('edit-delete');
 
     // Try to delete the main menu.
     $this->drupalGet('admin/structure/menu/manage/main/delete');
@@ -648,7 +648,7 @@ class MenuUiTest extends BrowserTestBase {
         'title[0][value]' => 'title',
       ];
       $this->drupalPostForm("admin/structure/menu/manage/{$this->menu->id()}/add", $edit, t('Save'));
-      $this->assertRaw(t("The path '@link_path' is inaccessible.", ['@link_path' => $link_path]), 'Menu link was not created');
+      $this->assertRaw(t("The path '@link_path' is inaccessible.", ['@link_path' => $link_path]));
     }
   }
 
@@ -788,7 +788,7 @@ class MenuUiTest extends BrowserTestBase {
     // Reset menu link.
     $this->drupalPostForm("admin/structure/menu/link/{$menu_link->getPluginId()}/reset", [], t('Reset'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('The menu link was reset to its default settings.'), 'Menu link was reset');
+    $this->assertRaw(t('The menu link was reset to its default settings.'));
 
     // Verify menu link.
     $instance = \Drupal::service('plugin.manager.menu.link')->createInstance($menu_link->getPluginId());
@@ -808,7 +808,7 @@ class MenuUiTest extends BrowserTestBase {
     // Delete menu link.
     $this->drupalPostForm("admin/structure/menu/item/$mlid/delete", [], t('Delete'));
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('The menu link %title has been deleted.', ['%title' => $title]), 'Menu link was deleted');
+    $this->assertRaw(t('The menu link %title has been deleted.', ['%title' => $title]));
 
     // Verify deletion.
     $this->drupalGet('');
diff --git a/core/modules/node/tests/src/Functional/NodeAccessFieldTest.php b/core/modules/node/tests/src/Functional/NodeAccessFieldTest.php
index 938fe98d746..069d812891f 100644
--- a/core/modules/node/tests/src/Functional/NodeAccessFieldTest.php
+++ b/core/modules/node/tests/src/Functional/NodeAccessFieldTest.php
@@ -121,7 +121,7 @@ class NodeAccessFieldTest extends NodeTestBase {
 
     // Confirm that the new default value appears when creating a new node.
     $this->drupalGet('node/add/page');
-    $this->assertRaw($default, 'The updated default value is displayed when creating a new node.');
+    $this->assertRaw($default);
   }
 
 }
diff --git a/core/modules/node/tests/src/Functional/NodeActionsConfigurationTest.php b/core/modules/node/tests/src/Functional/NodeActionsConfigurationTest.php
index e696e001731..3ca3ababfaf 100644
--- a/core/modules/node/tests/src/Functional/NodeActionsConfigurationTest.php
+++ b/core/modules/node/tests/src/Functional/NodeActionsConfigurationTest.php
@@ -78,7 +78,7 @@ class NodeActionsConfigurationTest extends BrowserTestBase {
     $this->assertSession()->statusCodeEquals(200);
 
     // Make sure that the action was actually deleted.
-    $this->assertRaw(t('The action %action has been deleted.', ['%action' => $new_action_label]), 'The delete confirmation message appears after deleting the node_assign_owner_action action.');
+    $this->assertRaw(t('The action %action has been deleted.', ['%action' => $new_action_label]));
     $this->drupalGet('admin/config/system/actions');
     $this->assertSession()->statusCodeEquals(200);
     $this->assertNoText($new_action_label, 'The label for the node_assign_owner_action action does not appear on the actions administration page after deleting.');
diff --git a/core/modules/node/tests/src/Functional/NodeEditFormTest.php b/core/modules/node/tests/src/Functional/NodeEditFormTest.php
index 29d0f72ce0b..b630655340e 100644
--- a/core/modules/node/tests/src/Functional/NodeEditFormTest.php
+++ b/core/modules/node/tests/src/Functional/NodeEditFormTest.php
@@ -85,7 +85,7 @@ class NodeEditFormTest extends NodeTestBase {
 
     // Check that the title and body fields are displayed with the correct values.
     // @todo Ideally assertLink would support HTML, but it doesn't.
-    $this->assertRaw('Edit<span class="visually-hidden">(active tab)</span>', 'Edit tab found and marked active.');
+    $this->assertRaw('Edit<span class="visually-hidden">(active tab)</span>');
     $this->assertFieldByName($title_key, $edit[$title_key], 'Title field displayed.');
     $this->assertFieldByName($body_key, $edit[$body_key], 'Body field displayed.');
 
diff --git a/core/modules/node/tests/src/Functional/NodeFieldMultilingualTest.php b/core/modules/node/tests/src/Functional/NodeFieldMultilingualTest.php
index 1bd314b8ff1..844ed95a57a 100644
--- a/core/modules/node/tests/src/Functional/NodeFieldMultilingualTest.php
+++ b/core/modules/node/tests/src/Functional/NodeFieldMultilingualTest.php
@@ -55,7 +55,7 @@ class NodeFieldMultilingualTest extends BrowserTestBase {
       'language_configuration[language_alterable]' => TRUE,
     ];
     $this->drupalPostForm('admin/structure/types/manage/page', $edit, t('Save content type'));
-    $this->assertRaw(t('The content type %type has been updated.', ['%type' => 'Basic page']), 'Basic page content type has been updated.');
+    $this->assertRaw(t('The content type %type has been updated.', ['%type' => 'Basic page']));
 
     // Make node body translatable.
     $field_storage = FieldStorageConfig::loadByName('node', 'body');
@@ -102,10 +102,14 @@ class NodeFieldMultilingualTest extends BrowserTestBase {
 
     // Test multilingual field language fallback logic.
     $this->drupalGet("it/node/{$node->id()}");
-    $this->assertRaw($body_value, 'Body correctly displayed using Italian as requested language');
+    // Verify that body is correctly displayed using Italian as requested
+    // language.
+    $this->assertRaw($body_value);
 
     $this->drupalGet("node/{$node->id()}");
-    $this->assertRaw($body_value, 'Body correctly displayed using English as requested language');
+    // Verify that body is correctly displayed using English as requested
+    // language.
+    $this->assertRaw($body_value);
   }
 
   /**
diff --git a/core/modules/node/tests/src/Functional/NodeRSSContentTest.php b/core/modules/node/tests/src/Functional/NodeRSSContentTest.php
index 92bf08a5947..42cb7ef1438 100644
--- a/core/modules/node/tests/src/Functional/NodeRSSContentTest.php
+++ b/core/modules/node/tests/src/Functional/NodeRSSContentTest.php
@@ -62,8 +62,8 @@ class NodeRSSContentTest extends NodeTestBase {
     // Check that extra RSS elements and namespaces are added to RSS feed.
     $test_element = '<testElement>' . t('Value of testElement RSS element for node @nid.', ['@nid' => $node->id()]) . '</testElement>';
     $test_ns = 'xmlns:drupaltest="http://example.com/test-namespace"';
-    $this->assertRaw($test_element, 'Extra RSS elements appear in RSS feed.');
-    $this->assertRaw($test_ns, 'Extra namespaces appear in RSS feed.');
+    $this->assertRaw($test_element);
+    $this->assertRaw($test_ns);
 
     // Check that content added in 'rss' view mode doesn't appear when
     // viewing node.
@@ -109,9 +109,12 @@ class NodeRSSContentTest extends NodeTestBase {
     ]);
 
     $this->drupalGet('rss.xml');
-    $this->assertRaw(file_create_url('public://root-relative'), 'Root-relative URL is transformed to absolute.');
-    $this->assertRaw($protocol_relative_url, 'Protocol-relative URL is left untouched.');
-    $this->assertRaw($absolute_url, 'Absolute URL is left untouched.');
+    // Verify that root-relative URL is transformed to absolute.
+    $this->assertRaw(file_create_url('public://root-relative'));
+    // Verify that protocol-relative URL is left untouched.
+    $this->assertRaw($protocol_relative_url);
+    // Verify that absolute URL is left untouched.
+    $this->assertRaw($absolute_url);
   }
 
 }
diff --git a/core/modules/node/tests/src/Functional/NodeRevisionsAllTest.php b/core/modules/node/tests/src/Functional/NodeRevisionsAllTest.php
index 7b24ad92b46..43bb0ee53d5 100644
--- a/core/modules/node/tests/src/Functional/NodeRevisionsAllTest.php
+++ b/core/modules/node/tests/src/Functional/NodeRevisionsAllTest.php
@@ -154,8 +154,7 @@ class NodeRevisionsAllTest extends NodeTestBase {
         '@type' => 'Basic page',
         '%title' => $nodes[1]->getTitle(),
         '%revision-date' => $this->container->get('date.formatter')->format($nodes[1]->getRevisionCreationTime()),
-      ]),
-      'Revision reverted.');
+      ]));
     $node_storage->resetCache([$node->id()]);
     $reverted_node = $node_storage->load($node->id());
     $this->assertTrue(($nodes[1]->body->value == $reverted_node->body->value), 'Node reverted correctly.');
@@ -181,8 +180,7 @@ class NodeRevisionsAllTest extends NodeTestBase {
         '%revision-date' => $this->container->get('date.formatter')->format($nodes[1]->getRevisionCreationTime()),
         '@type' => 'Basic page',
         '%title' => $nodes[1]->getTitle(),
-      ]),
-      'Revision deleted.');
+      ]));
     $nids = \Drupal::entityQuery('node')
       ->allRevisions()
       ->accessCheck(FALSE)
diff --git a/core/modules/node/tests/src/Functional/NodeRevisionsTest.php b/core/modules/node/tests/src/Functional/NodeRevisionsTest.php
index 77951ac1756..1a7a591d626 100644
--- a/core/modules/node/tests/src/Functional/NodeRevisionsTest.php
+++ b/core/modules/node/tests/src/Functional/NodeRevisionsTest.php
@@ -176,7 +176,7 @@ class NodeRevisionsTest extends NodeTestBase {
       '@type' => 'Basic page',
       '%title' => $nodes[1]->label(),
       '%revision-date' => $this->container->get('date.formatter')->format($nodes[1]->getRevisionCreationTime()),
-    ]), 'Revision reverted.');
+    ]));
     $node_storage->resetCache([$node->id()]);
     $reverted_node = $node_storage->load($node->id());
     $this->assertTrue(($nodes[1]->body->value == $reverted_node->body->value), 'Node reverted correctly.');
@@ -195,7 +195,7 @@ class NodeRevisionsTest extends NodeTestBase {
       '%revision-date' => $this->container->get('date.formatter')->format($nodes[1]->getRevisionCreationTime()),
       '@type' => 'Basic page',
       '%title' => $nodes[1]->label(),
-    ]), 'Revision deleted.');
+    ]));
     $connection = Database::getConnection();
     $nids = \Drupal::entityQuery('node')
       ->accessCheck(FALSE)
diff --git a/core/modules/node/tests/src/Functional/NodeTitleTest.php b/core/modules/node/tests/src/Functional/NodeTitleTest.php
index 5889816d3c7..4f048e63839 100644
--- a/core/modules/node/tests/src/Functional/NodeTitleTest.php
+++ b/core/modules/node/tests/src/Functional/NodeTitleTest.php
@@ -103,11 +103,11 @@ class NodeTitleTest extends NodeTestBase {
     // the page.
     $edge_case_title_escaped = Html::escape($edge_case_title);
     $this->drupalGet('node/' . $node->id());
-    $this->assertRaw('<title>' . $edge_case_title_escaped . ' | Drupal</title>', 'Page title is equal to article\'s "title".', 'Node');
+    $this->assertRaw('<title>' . $edge_case_title_escaped . ' | Drupal</title>');
 
     // Test that the title appears as <title> when reloading the node page.
     $this->drupalGet('node/' . $node->id());
-    $this->assertRaw('<title>' . $edge_case_title_escaped . ' | Drupal</title>', 'Page title is equal to article\'s "title".', 'Node');
+    $this->assertRaw('<title>' . $edge_case_title_escaped . ' | Drupal</title>');
 
   }
 
diff --git a/core/modules/node/tests/src/Functional/NodeTitleXSSTest.php b/core/modules/node/tests/src/Functional/NodeTitleXSSTest.php
index 6207a0bbf63..7a61a01f9fc 100644
--- a/core/modules/node/tests/src/Functional/NodeTitleXSSTest.php
+++ b/core/modules/node/tests/src/Functional/NodeTitleXSSTest.php
@@ -34,18 +34,19 @@ class NodeTitleXSSTest extends NodeTestBase {
     $edit['title[0][value]'] = $title;
 
     $this->drupalPostForm('node/add/page', $edit, t('Preview'));
-    $this->assertNoRaw($xss, 'Harmful tags are escaped when previewing a node.');
+    // Verify that harmful tags are escaped when previewing a node.
+    $this->assertNoRaw($xss);
 
     $settings = ['title' => $title];
     $node = $this->drupalCreateNode($settings);
 
     $this->drupalGet('node/' . $node->id());
     // Titles should be escaped.
-    $this->assertRaw('<title>' . Html::escape($title) . ' | Drupal</title>', 'Title is displayed when viewing a node.');
-    $this->assertNoRaw($xss, 'Harmful tags are escaped when viewing a node.');
+    $this->assertRaw('<title>' . Html::escape($title) . ' | Drupal</title>');
+    $this->assertNoRaw($xss);
 
     $this->drupalGet('node/' . $node->id() . '/edit');
-    $this->assertNoRaw($xss, 'Harmful tags are escaped when editing a node.');
+    $this->assertNoRaw($xss);
   }
 
 }
diff --git a/core/modules/node/tests/src/Functional/NodeTranslationUITest.php b/core/modules/node/tests/src/Functional/NodeTranslationUITest.php
index 9c64abe555d..d8cb9e3e3e7 100644
--- a/core/modules/node/tests/src/Functional/NodeTranslationUITest.php
+++ b/core/modules/node/tests/src/Functional/NodeTranslationUITest.php
@@ -251,13 +251,15 @@ class NodeTranslationUITest extends ContentTranslationUITestBase {
     $edit['use_admin_theme'] = TRUE;
     $this->drupalPostForm('admin/appearance', $edit, t('Save configuration'));
     $this->drupalGet('node/' . $article->id() . '/translations');
-    $this->assertRaw('core/themes/seven/css/base/elements.css', 'Translation uses admin theme if edit is admin.');
+    // Verify that translation uses the admin theme if edit is admin.
+    $this->assertRaw('core/themes/seven/css/base/elements.css');
 
     // Turn off admin theme for editing, assert inheritance to translations.
     $edit['use_admin_theme'] = FALSE;
     $this->drupalPostForm('admin/appearance', $edit, t('Save configuration'));
     $this->drupalGet('node/' . $article->id() . '/translations');
-    $this->assertNoRaw('core/themes/seven/css/base/elements.css', 'Translation uses frontend theme if edit is frontend.');
+    // Verify that translation uses the frontend theme if edit is frontend.
+    $this->assertNoRaw('core/themes/seven/css/base/elements.css');
 
     // Assert presence of translation page itself (vs. DisabledBundle below).
     $this->assertSession()->statusCodeEquals(200);
diff --git a/core/modules/node/tests/src/Functional/NodeTypeTest.php b/core/modules/node/tests/src/Functional/NodeTypeTest.php
index 3871d6bcdda..f1eed3f9987 100644
--- a/core/modules/node/tests/src/Functional/NodeTypeTest.php
+++ b/core/modules/node/tests/src/Functional/NodeTypeTest.php
@@ -186,8 +186,7 @@ class NodeTypeTest extends NodeTestBase {
     // Attempt to delete the content type, which should not be allowed.
     $this->drupalGet('admin/structure/types/manage/' . $type->label() . '/delete');
     $this->assertRaw(
-      t('%type is used by 1 piece of content on your site. You can not remove this content type until you have removed all of the %type content.', ['%type' => $type->label()]),
-      'The content type will not be deleted until all nodes of that type are removed.'
+     t('%type is used by 1 piece of content on your site. You can not remove this content type until you have removed all of the %type content.', ['%type' => $type->label()])
     );
     $this->assertNoText('This action cannot be undone.', 'The node type deletion confirmation form is not available.');
 
@@ -196,8 +195,7 @@ class NodeTypeTest extends NodeTestBase {
     // Attempt to delete the content type, which should now be allowed.
     $this->drupalGet('admin/structure/types/manage/' . $type->label() . '/delete');
     $this->assertRaw(
-      t('Are you sure you want to delete the content type %type?', ['%type' => $type->label()]),
-      'The content type is available for deletion.'
+      t('Are you sure you want to delete the content type %type?', ['%type' => $type->label()])
     );
     $this->assertText(t('This action cannot be undone.'), 'The node type deletion confirmation form is available.');
 
@@ -273,7 +271,7 @@ class NodeTypeTest extends NodeTestBase {
     $this->drupalGet('admin/structure/types');
     $this->assertRaw(t('No content types available. <a href=":link">Add content type</a>.', [
         ':link' => Url::fromRoute('node.type_add')->toString(),
-      ]), 'Empty text when there are no content types in the system is correct.');
+      ]));
 
     $bundle_info->clearCachedBundles();
     $this->assertCount(0, $bundle_info->getBundleInfo('node'), 'The bundle information service has 0 bundles for the Node entity type.');
diff --git a/core/modules/node/tests/src/Functional/PagePreviewTest.php b/core/modules/node/tests/src/Functional/PagePreviewTest.php
index 525134d6b07..806725efad8 100644
--- a/core/modules/node/tests/src/Functional/PagePreviewTest.php
+++ b/core/modules/node/tests/src/Functional/PagePreviewTest.php
@@ -227,7 +227,7 @@ class PagePreviewTest extends NodeTestBase {
 
     $view_mode_edit = ['view_mode' => 'teaser'];
     $this->drupalPostForm('node/preview/' . $uuid . '/full', $view_mode_edit, t('Switch'));
-    $this->assertRaw('view-mode-teaser', 'View mode teaser class found.');
+    $this->assertRaw('view-mode-teaser');
     $this->assertNoText($edit[$body_key], 'Body not displayed.');
 
     // Check that the title, body and term fields are displayed with the
@@ -275,8 +275,8 @@ class PagePreviewTest extends NodeTestBase {
     $newterm2 = $this->randomMachineName(8);
     $edit[$term_key] = $this->term->getName() . ', ' . $newterm1 . ', ' . $newterm2;
     $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Preview'));
-    $this->assertRaw('>' . $newterm1 . '<', 'First new term displayed.');
-    $this->assertRaw('>' . $newterm2 . '<', 'Second new term displayed.');
+    $this->assertRaw('>' . $newterm1 . '<');
+    $this->assertRaw('>' . $newterm2 . '<');
     // The first term should be displayed as link, the others not.
     $this->assertSession()->linkExists($this->term->getName());
     $this->assertSession()->linkNotExists($newterm1);
@@ -290,9 +290,9 @@ class PagePreviewTest extends NodeTestBase {
     $newterm3 = $this->randomMachineName(8);
     $edit[$term_key] = $newterm1 . ', ' . $newterm3 . ', ' . $newterm2;
     $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Preview'));
-    $this->assertRaw('>' . $newterm1 . '<', 'First existing term displayed.');
-    $this->assertRaw('>' . $newterm2 . '<', 'Second existing term displayed.');
-    $this->assertRaw('>' . $newterm3 . '<', 'Third new term displayed.');
+    $this->assertRaw('>' . $newterm1 . '<');
+    $this->assertRaw('>' . $newterm2 . '<');
+    $this->assertRaw('>' . $newterm3 . '<');
     $this->assertNoText($this->term->getName());
     $this->assertSession()->linkExists($newterm1);
     $this->assertSession()->linkExists($newterm2);
diff --git a/core/modules/options/tests/src/Functional/OptionsFieldUITest.php b/core/modules/options/tests/src/Functional/OptionsFieldUITest.php
index 13f730ba1ef..2e046828662 100644
--- a/core/modules/options/tests/src/Functional/OptionsFieldUITest.php
+++ b/core/modules/options/tests/src/Functional/OptionsFieldUITest.php
@@ -319,7 +319,8 @@ class OptionsFieldUITest extends FieldTestBase {
   public function assertAllowedValuesInput($input_string, $result, $message) {
     $edit = ['settings[allowed_values]' => $input_string];
     $this->drupalPostForm($this->adminPath, $edit, t('Save field settings'));
-    $this->assertNoRaw('&amp;lt;', 'The page does not have double escaped HTML tags.');
+    // Verify that the page does not have double escaped HTML tags.
+    $this->assertNoRaw('&amp;lt;');
 
     if (is_string($result)) {
       $this->assertText($result, $message);
diff --git a/core/modules/options/tests/src/Functional/OptionsWidgetsTest.php b/core/modules/options/tests/src/Functional/OptionsWidgetsTest.php
index 1b3511fa723..8a11c4761d4 100644
--- a/core/modules/options/tests/src/Functional/OptionsWidgetsTest.php
+++ b/core/modules/options/tests/src/Functional/OptionsWidgetsTest.php
@@ -148,7 +148,7 @@ class OptionsWidgetsTest extends FieldTestBase {
     $this->assertSession()->checkboxNotChecked('edit-card-1-0');
     $this->assertSession()->checkboxNotChecked('edit-card-1-1');
     $this->assertSession()->checkboxNotChecked('edit-card-1-2');
-    $this->assertRaw('Some dangerous &amp; unescaped <strong>markup</strong>', 'Option text was properly filtered.');
+    $this->assertRaw('Some dangerous &amp; unescaped <strong>markup</strong>');
     $this->assertRaw('Some HTML encoded markup with &lt; &amp; &gt;');
 
     // Select first option.
@@ -206,7 +206,7 @@ class OptionsWidgetsTest extends FieldTestBase {
     $this->assertSession()->checkboxNotChecked('edit-card-2-0');
     $this->assertSession()->checkboxNotChecked('edit-card-2-1');
     $this->assertSession()->checkboxNotChecked('edit-card-2-2');
-    $this->assertRaw('Some dangerous &amp; unescaped <strong>markup</strong>', 'Option text was properly filtered.');
+    $this->assertRaw('Some dangerous &amp; unescaped <strong>markup</strong>');
 
     // Submit form: select first and third options.
     $edit = [
@@ -302,12 +302,12 @@ class OptionsWidgetsTest extends FieldTestBase {
     $this->assertFalse($this->assertSession()->optionExists('card_1', 0)->isSelected());
     $this->assertFalse($this->assertSession()->optionExists('card_1', 1)->isSelected());
     $this->assertFalse($this->assertSession()->optionExists('card_1', 2)->isSelected());
-    $this->assertRaw('Some dangerous &amp; unescaped markup', 'Option text was properly filtered.');
+    $this->assertRaw('Some dangerous &amp; unescaped markup');
 
     // Submit form: select invalid 'none' option.
     $edit = ['card_1' => '_none'];
     $this->drupalPostForm(NULL, $edit, t('Save'));
-    $this->assertRaw(t('@title field is required.', ['@title' => $field->getName()]), 'Cannot save a required field when selecting "none" from the select list.');
+    $this->assertRaw(t('@title field is required.', ['@title' => $field->getName()]));
 
     // Submit form: select first option.
     $edit = ['card_1' => 0];
@@ -346,9 +346,9 @@ class OptionsWidgetsTest extends FieldTestBase {
     $this->assertFalse($this->assertSession()->optionExists('card_1', 0)->isSelected());
     $this->assertFalse($this->assertSession()->optionExists('card_1', 1)->isSelected());
     $this->assertFalse($this->assertSession()->optionExists('card_1', 2)->isSelected());
-    $this->assertRaw('Some dangerous &amp; unescaped markup', 'Option text was properly filtered.');
-    $this->assertRaw('More &lt;script&gt;dangerous&lt;/script&gt; markup', 'Option group text was properly filtered.');
-    $this->assertRaw('Group 1', 'Option groups are displayed.');
+    $this->assertRaw('Some dangerous &amp; unescaped markup');
+    $this->assertRaw('More &lt;script&gt;dangerous&lt;/script&gt; markup');
+    $this->assertRaw('Group 1');
 
     // Submit form: select first option.
     $edit = ['card_1' => 0];
@@ -398,7 +398,7 @@ class OptionsWidgetsTest extends FieldTestBase {
     $this->assertFalse($this->assertSession()->optionExists('card_2', 0)->isSelected());
     $this->assertFalse($this->assertSession()->optionExists('card_2', 1)->isSelected());
     $this->assertFalse($this->assertSession()->optionExists('card_2', 2)->isSelected());
-    $this->assertRaw('Some dangerous &amp; unescaped markup', 'Option text was properly filtered.');
+    $this->assertRaw('Some dangerous &amp; unescaped markup');
 
     // Submit form: select first and third options.
     $edit = ['card_2[]' => [0 => 0, 2 => 2]];
@@ -468,9 +468,9 @@ class OptionsWidgetsTest extends FieldTestBase {
     $this->assertFalse($this->assertSession()->optionExists('card_2', 0)->isSelected());
     $this->assertFalse($this->assertSession()->optionExists('card_2', 1)->isSelected());
     $this->assertFalse($this->assertSession()->optionExists('card_2', 2)->isSelected());
-    $this->assertRaw('Some dangerous &amp; unescaped markup', 'Option text was properly filtered.');
-    $this->assertRaw('More &lt;script&gt;dangerous&lt;/script&gt; markup', 'Option group text was properly filtered.');
-    $this->assertRaw('Group 1', 'Option groups are displayed.');
+    $this->assertRaw('Some dangerous &amp; unescaped markup');
+    $this->assertRaw('More &lt;script&gt;dangerous&lt;/script&gt; markup');
+    $this->assertRaw('Group 1');
 
     // Submit form: select first option.
     $edit = ['card_2[]' => [0 => 0]];
diff --git a/core/modules/page_cache/tests/src/Functional/PageCacheTest.php b/core/modules/page_cache/tests/src/Functional/PageCacheTest.php
index cef8b3b0426..13e427e59f0 100644
--- a/core/modules/page_cache/tests/src/Functional/PageCacheTest.php
+++ b/core/modules/page_cache/tests/src/Functional/PageCacheTest.php
@@ -136,7 +136,8 @@ class PageCacheTest extends BrowserTestBase {
     $this->drupalGet($accept_header_cache_url);
     // Verify that HTML page was cached.
     $this->assertSession()->responseHeaderEquals('X-Drupal-Cache', 'HIT');
-    $this->assertRaw('<p>oh hai this is html.</p>', 'The correct HTML response was returned.');
+    // Verify that the correct HTML response was returned.
+    $this->assertRaw('<p>oh hai this is html.</p>');
 
     $this->drupalGet($accept_header_cache_url_with_json);
     // Verify that JSON response was not yet cached.
@@ -144,7 +145,8 @@ class PageCacheTest extends BrowserTestBase {
     $this->drupalGet($accept_header_cache_url_with_json);
     // Verify that JSON response was cached.
     $this->assertSession()->responseHeaderEquals('X-Drupal-Cache', 'HIT');
-    $this->assertRaw('{"content":"oh hai this is json"}', 'The correct Json response was returned.');
+    // Verify that the correct JSON response was returned.
+    $this->assertRaw('{"content":"oh hai this is json"}');
 
     // Enable REST support for nodes and hal+json.
     \Drupal::service('module_installer')->install(['node', 'rest', 'hal', 'basic_auth']);
diff --git a/core/modules/path/tests/src/Functional/PathAliasTest.php b/core/modules/path/tests/src/Functional/PathAliasTest.php
index 6bd0a071156..3772e2b7ede 100644
--- a/core/modules/path/tests/src/Functional/PathAliasTest.php
+++ b/core/modules/path/tests/src/Functional/PathAliasTest.php
@@ -142,7 +142,7 @@ class PathAliasTest extends PathTestBase {
     $this->drupalPostForm('admin/config/search/path/add', $edit, t('Save'));
 
     // Confirm no duplicate was created.
-    $this->assertRaw(t('The alias %alias is already in use in this language.', ['%alias' => $edit['alias[0][value]']]), 'Attempt to move alias was rejected.');
+    $this->assertRaw(t('The alias %alias is already in use in this language.', ['%alias' => $edit['alias[0][value]']]));
 
     $edit_upper = $edit;
     $edit_upper['alias[0][value]'] = mb_strtoupper($edit['alias[0][value]']);
@@ -150,7 +150,7 @@ class PathAliasTest extends PathTestBase {
     $this->assertRaw(t('The alias %alias could not be added because it is already in use in this language with different capitalization: %stored_alias.', [
       '%alias' => $edit_upper['alias[0][value]'],
       '%stored_alias' => $edit['alias[0][value]'],
-    ]), 'Attempt to move upper-case alias was rejected.');
+    ]));
 
     // Delete alias.
     $this->drupalGet('admin/config/search/path/edit/' . $pid);
diff --git a/core/modules/quickedit/tests/src/FunctionalJavascript/QuickEditLoadingTest.php b/core/modules/quickedit/tests/src/FunctionalJavascript/QuickEditLoadingTest.php
index ee646850042..e1fb1081392 100644
--- a/core/modules/quickedit/tests/src/FunctionalJavascript/QuickEditLoadingTest.php
+++ b/core/modules/quickedit/tests/src/FunctionalJavascript/QuickEditLoadingTest.php
@@ -128,8 +128,8 @@ class QuickEditLoadingTest extends WebDriverTestBase {
     $this->drupalGet('node/1');
 
     // Library and in-place editors.
-    $this->assertNoRaw('core/modules/quickedit/js/quickedit.js', 'Quick Edit library not loaded.');
-    $this->assertNoRaw('core/modules/quickedit/js/editors/formEditor.js', "'form' in-place editor not loaded.");
+    $this->assertNoRaw('core/modules/quickedit/js/quickedit.js');
+    $this->assertNoRaw('core/modules/quickedit/js/editors/formEditor.js');
 
     // HTML annotation and title class does not exist for users without
     // permission to in-place edit.
diff --git a/core/modules/responsive_image/tests/src/Functional/ResponsiveImageFieldDisplayTest.php b/core/modules/responsive_image/tests/src/Functional/ResponsiveImageFieldDisplayTest.php
index 84426caaf96..d3cc450c863 100644
--- a/core/modules/responsive_image/tests/src/Functional/ResponsiveImageFieldDisplayTest.php
+++ b/core/modules/responsive_image/tests/src/Functional/ResponsiveImageFieldDisplayTest.php
@@ -204,7 +204,7 @@ class ResponsiveImageFieldDisplayTest extends ImageFieldTestBase {
       '#alt' => $alt,
     ];
     $default_output = str_replace("\n", NULL, $renderer->renderRoot($image));
-    $this->assertRaw($default_output, 'Default formatter displaying correctly on full node view.');
+    $this->assertRaw($default_output);
 
     // Test field not being configured. This should not cause a fatal error.
     $display_options = [
@@ -330,7 +330,7 @@ class ResponsiveImageFieldDisplayTest extends ImageFieldTestBase {
     // responsive-image.html.twig doesn't have one after the fallback image, so
     // we remove it here.
     $default_output = trim($renderer->renderRoot($fallback_image));
-    $this->assertRaw($default_output, 'Image style large formatter displaying correctly on full node view.');
+    $this->assertRaw($default_output);
 
     if ($scheme == 'private') {
       // Log out and ensure the file cannot be accessed.
diff --git a/core/modules/search/tests/src/Functional/SearchCommentTest.php b/core/modules/search/tests/src/Functional/SearchCommentTest.php
index 1f3933d0f0d..d3164a91f3e 100644
--- a/core/modules/search/tests/src/Functional/SearchCommentTest.php
+++ b/core/modules/search/tests/src/Functional/SearchCommentTest.php
@@ -172,7 +172,8 @@ class SearchCommentTest extends BrowserTestBase {
 
     // Verify that comment is rendered using proper format.
     $this->assertText($comment_body, 'Comment body text found in search results.');
-    $this->assertNoRaw(t('n/a'), 'HTML in comment body is not hidden.');
+    // Verify that HTML in comment body is not hidden.
+    $this->assertNoRaw(t('n/a'));
     $this->assertSession()->assertNoEscaped($edit_comment['comment_body[0][value]']);
 
     // Search for the evil script comment subject.
diff --git a/core/modules/statistics/tests/src/Functional/StatisticsAttachedTest.php b/core/modules/statistics/tests/src/Functional/StatisticsAttachedTest.php
index 719bc507be9..73f95f671ae 100644
--- a/core/modules/statistics/tests/src/Functional/StatisticsAttachedTest.php
+++ b/core/modules/statistics/tests/src/Functional/StatisticsAttachedTest.php
@@ -56,7 +56,7 @@ class StatisticsAttachedTest extends BrowserTestBase {
     $node->save();
     $this->drupalGet('node/' . $node->id());
 
-    $this->assertRaw('core/modules/statistics/statistics.js', 'Statistics library is available');
+    $this->assertRaw('core/modules/statistics/statistics.js');
   }
 
 }
diff --git a/core/modules/statistics/tests/src/Functional/StatisticsReportsTest.php b/core/modules/statistics/tests/src/Functional/StatisticsReportsTest.php
index 0b80251d6cf..c4122dfb45c 100644
--- a/core/modules/statistics/tests/src/Functional/StatisticsReportsTest.php
+++ b/core/modules/statistics/tests/src/Functional/StatisticsReportsTest.php
@@ -63,7 +63,7 @@ class StatisticsReportsTest extends StatisticsTestBase {
     $this->assertCacheContexts($contexts);
 
     // Check if the node link is displayed.
-    $this->assertRaw(Link::fromTextAndUrl($node->label(), $node->toUrl('canonical'))->toString(), 'Found link to visited node.');
+    $this->assertRaw(Link::fromTextAndUrl($node->label(), $node->toUrl('canonical'))->toString());
   }
 
 }
diff --git a/core/modules/system/tests/src/Functional/Batch/PageTest.php b/core/modules/system/tests/src/Functional/Batch/PageTest.php
index d63aa5acb9e..c73cc4a66c7 100644
--- a/core/modules/system/tests/src/Functional/Batch/PageTest.php
+++ b/core/modules/system/tests/src/Functional/Batch/PageTest.php
@@ -76,12 +76,15 @@ class PageTest extends BrowserTestBase {
     // Go to the initial step only.
     $this->maximumMetaRefreshCount = 0;
     $this->drupalGet('batch-test/test-title');
-    $this->assertRaw('<div class="progress__description">Initializing.<br />&nbsp;</div>', 'Initial progress message appears correctly.');
-    $this->assertNoRaw('&amp;nbsp;', 'Initial progress message is not double escaped.');
+    // Check that the initial progress message appears correctly and is not
+    // double escaped.
+    $this->assertRaw('<div class="progress__description">Initializing.<br />&nbsp;</div>');
+    $this->assertNoRaw('&amp;nbsp;');
     // Now also go to the next step.
     $this->maximumMetaRefreshCount = 1;
     $this->drupalGet('batch-test/test-title');
-    $this->assertRaw('<div class="progress__description">Completed 1 of 1.</div>', 'Progress message for second step appears correctly.');
+    // Check that the progress message for second step appears correctly.
+    $this->assertRaw('<div class="progress__description">Completed 1 of 1.</div>');
   }
 
 }
diff --git a/core/modules/system/tests/src/Functional/Entity/EntityListBuilderTest.php b/core/modules/system/tests/src/Functional/Entity/EntityListBuilderTest.php
index d132271cad2..cba5d3bcf7d 100644
--- a/core/modules/system/tests/src/Functional/Entity/EntityListBuilderTest.php
+++ b/core/modules/system/tests/src/Functional/Entity/EntityListBuilderTest.php
@@ -49,13 +49,13 @@ class EntityListBuilderTest extends BrowserTestBase {
     $this->drupalGet('entity_test/list');
 
     // Item 51 should not be present.
-    $this->assertRaw('Test entity 50', 'Item 50 is shown.');
-    $this->assertNoRaw('Test entity 51', 'Item 51 is on the next page.');
+    $this->assertRaw('Test entity 50');
+    $this->assertNoRaw('Test entity 51');
 
-    // Browse to the next page.
+    // Browse to the next page, test entity 51 is shown.
     $this->clickLink(t('Page 2'));
-    $this->assertNoRaw('Test entity 50', 'Test entity 50 is on the previous page.');
-    $this->assertRaw('Test entity 51', 'Test entity 51 is shown.');
+    $this->assertNoRaw('Test entity 50');
+    $this->assertRaw('Test entity 51');
   }
 
   /**
diff --git a/core/modules/system/tests/src/Functional/Entity/EntityTranslationFormTest.php b/core/modules/system/tests/src/Functional/Entity/EntityTranslationFormTest.php
index 4d2372daa1e..235377a20b1 100644
--- a/core/modules/system/tests/src/Functional/Entity/EntityTranslationFormTest.php
+++ b/core/modules/system/tests/src/Functional/Entity/EntityTranslationFormTest.php
@@ -87,7 +87,7 @@ class EntityTranslationFormTest extends BrowserTestBase {
     $this->drupalGet('admin/structure/types/manage/page');
     $edit = ['language_configuration[language_alterable]' => TRUE, 'language_configuration[langcode]' => LanguageInterface::LANGCODE_NOT_SPECIFIED];
     $this->drupalPostForm('admin/structure/types/manage/page', $edit, t('Save content type'));
-    $this->assertRaw(t('The content type %type has been updated.', ['%type' => 'Basic page']), 'Basic page content type has been updated.');
+    $this->assertRaw(t('The content type %type has been updated.', ['%type' => 'Basic page']));
 
     // Create a node with language.
     $edit = [];
diff --git a/core/modules/system/tests/src/Functional/Form/FormTest.php b/core/modules/system/tests/src/Functional/Form/FormTest.php
index c0881551b7e..18762a25c11 100644
--- a/core/modules/system/tests/src/Functional/Form/FormTest.php
+++ b/core/modules/system/tests/src/Functional/Form/FormTest.php
@@ -233,7 +233,7 @@ class FormTest extends BrowserTestBase {
     ];
     $this->drupalPostForm(NULL, $edit, 'Submit');
     $this->assertNoFieldByXpath('//div[contains(@class, "error")]', FALSE, 'No error message is displayed when all required fields are filled.');
-    $this->assertRaw("The form_test_validate_required_form form was submitted successfully.", 'Validation form submitted successfully.');
+    $this->assertRaw("The form_test_validate_required_form form was submitted successfully.");
   }
 
   /**
@@ -343,7 +343,7 @@ class FormTest extends BrowserTestBase {
     // Attempt to submit the form with no required field set.
     $edit = [];
     $this->drupalPostForm('form-test/validate-required-no-title', $edit, 'Submit');
-    $this->assertNoRaw("The form_test_validate_required_form_no_title form was submitted successfully.", 'Validation form submitted successfully.');
+    $this->assertNoRaw("The form_test_validate_required_form_no_title form was submitted successfully.");
 
     // Check the page for the error class on the textfield.
     $this->assertFieldByXPath('//input[contains(@class, "error")]', FALSE, 'Error input form element class found.');
@@ -358,7 +358,7 @@ class FormTest extends BrowserTestBase {
     ];
     $this->drupalPostForm(NULL, $edit, 'Submit');
     $this->assertNoFieldByXpath('//input[contains(@class, "error")]', FALSE, 'No error input form element class found.');
-    $this->assertRaw("The form_test_validate_required_form_no_title form was submitted successfully.", 'Validation form submitted successfully.');
+    $this->assertRaw("The form_test_validate_required_form_no_title form was submitted successfully.");
   }
 
   /**
@@ -370,7 +370,7 @@ class FormTest extends BrowserTestBase {
     // First, try to submit without the required checkbox.
     $edit = [];
     $this->drupalPostForm('form-test/checkbox', $edit, t('Submit'));
-    $this->assertRaw(t('@name field is required.', ['@name' => 'required_checkbox']), 'A required checkbox is actually mandatory');
+    $this->assertRaw(t('@name field is required.', ['@name' => 'required_checkbox']));
 
     // Now try to submit the form correctly.
     $this->drupalPostForm(NULL, ['required_checkbox' => 1], t('Submit'));
diff --git a/core/modules/system/tests/src/Functional/Form/StateValuesCleanAdvancedTest.php b/core/modules/system/tests/src/Functional/Form/StateValuesCleanAdvancedTest.php
index e3d55f8fcf6..486e3b877ff 100644
--- a/core/modules/system/tests/src/Functional/Form/StateValuesCleanAdvancedTest.php
+++ b/core/modules/system/tests/src/Functional/Form/StateValuesCleanAdvancedTest.php
@@ -57,7 +57,7 @@ class StateValuesCleanAdvancedTest extends BrowserTestBase {
 
     // Expecting a 200 HTTP code.
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw(t('You WIN!'), 'Found the success message.');
+    $this->assertRaw(t('You WIN!'));
   }
 
 }
diff --git a/core/modules/system/tests/src/Functional/Menu/MenuRouterTest.php b/core/modules/system/tests/src/Functional/Menu/MenuRouterTest.php
index d4cfa3e29de..5ef24164ad8 100644
--- a/core/modules/system/tests/src/Functional/Menu/MenuRouterTest.php
+++ b/core/modules/system/tests/src/Functional/Menu/MenuRouterTest.php
@@ -269,7 +269,7 @@ class MenuRouterTest extends BrowserTestBase {
   protected function doTestThemeCallbackAdministrative() {
     $this->drupalGet('menu-test/theme-callback/use-admin-theme');
     $this->assertText('Active theme: seven. Actual theme: seven.', 'The administrative theme can be correctly set in a theme negotiation.');
-    $this->assertRaw('seven/css/base/elements.css', "The administrative theme's CSS appears on the page.");
+    $this->assertRaw('seven/css/base/elements.css');
   }
 
   /**
@@ -281,14 +281,16 @@ class MenuRouterTest extends BrowserTestBase {
     // For a regular user, the fact that the site is in maintenance mode means
     // we expect the theme callback system to be bypassed entirely.
     $this->drupalGet('menu-test/theme-callback/use-admin-theme');
-    $this->assertRaw('bartik/css/base/elements.css', "The maintenance theme's CSS appears on the page.");
+    // Check that the maintenance theme's CSS appears on the page.
+    $this->assertRaw('bartik/css/base/elements.css');
 
     // An administrator, however, should continue to see the requested theme.
     $admin_user = $this->drupalCreateUser(['access site in maintenance mode']);
     $this->drupalLogin($admin_user);
     $this->drupalGet('menu-test/theme-callback/use-admin-theme');
     $this->assertText('Active theme: seven. Actual theme: seven.', 'The theme negotiation system is correctly triggered for an administrator when the site is in maintenance mode.');
-    $this->assertRaw('seven/css/base/elements.css', "The administrative theme's CSS appears on the page.");
+    // Check that the administrative theme's CSS appears on the page.
+    $this->assertRaw('seven/css/base/elements.css');
 
     $this->container->get('state')->set('system.maintenance_mode', FALSE);
   }
@@ -300,7 +302,8 @@ class MenuRouterTest extends BrowserTestBase {
     // Request a theme that is not installed.
     $this->drupalGet('menu-test/theme-callback/use-test-theme');
     $this->assertText('Active theme: bartik. Actual theme: bartik.', 'The theme negotiation system falls back on the default theme when a theme that is not installed is requested.');
-    $this->assertRaw('bartik/css/base/elements.css', "The default theme's CSS appears on the page.");
+    // Check that the default theme's CSS appears on the page.
+    $this->assertRaw('bartik/css/base/elements.css');
 
     // Now install the theme and request it again.
     /** @var \Drupal\Core\Extension\ThemeInstallerInterface $theme_installer */
@@ -309,7 +312,8 @@ class MenuRouterTest extends BrowserTestBase {
 
     $this->drupalGet('menu-test/theme-callback/use-test-theme');
     $this->assertText('Active theme: test_theme. Actual theme: test_theme.', 'The theme negotiation system uses an optional theme once it has been installed.');
-    $this->assertRaw('test_theme/kitten.css', "The optional theme's CSS appears on the page.");
+    // Check that the optional theme's CSS appears on the page.
+    $this->assertRaw('test_theme/kitten.css');
 
     $theme_installer->uninstall(['test_theme']);
   }
@@ -320,7 +324,8 @@ class MenuRouterTest extends BrowserTestBase {
   protected function doTestThemeCallbackFakeTheme() {
     $this->drupalGet('menu-test/theme-callback/use-fake-theme');
     $this->assertText('Active theme: bartik. Actual theme: bartik.', 'The theme negotiation system falls back on the default theme when a theme that does not exist is requested.');
-    $this->assertRaw('bartik/css/base/elements.css', "The default theme's CSS appears on the page.");
+    // Check that the default theme's CSS appears on the page.
+    $this->assertRaw('bartik/css/base/elements.css');
   }
 
   /**
@@ -329,7 +334,8 @@ class MenuRouterTest extends BrowserTestBase {
   protected function doTestThemeCallbackNoThemeRequested() {
     $this->drupalGet('menu-test/theme-callback/no-theme-requested');
     $this->assertText('Active theme: bartik. Actual theme: bartik.', 'The theme negotiation system falls back on the default theme when no theme is requested.');
-    $this->assertRaw('bartik/css/base/elements.css', "The default theme's CSS appears on the page.");
+    // Check that the default theme's CSS appears on the page.
+    $this->assertRaw('bartik/css/base/elements.css');
   }
 
 }
diff --git a/core/modules/system/tests/src/Functional/Module/DependencyTest.php b/core/modules/system/tests/src/Functional/Module/DependencyTest.php
index b8022c8b884..75f5cfc2aaf 100644
--- a/core/modules/system/tests/src/Functional/Module/DependencyTest.php
+++ b/core/modules/system/tests/src/Functional/Module/DependencyTest.php
@@ -63,7 +63,7 @@ class DependencyTest extends ModuleTestBase {
     // Test that the system_dependencies_test module is marked
     // as missing a dependency.
     $this->drupalGet('admin/modules');
-    $this->assertRaw(t('@module (<span class="admin-missing">missing</span>)', ['@module' => Unicode::ucfirst('_missing_dependency')]), 'A module with missing dependencies is marked as such.');
+    $this->assertRaw(t('@module (<span class="admin-missing">missing</span>)', ['@module' => Unicode::ucfirst('_missing_dependency')]));
     $checkbox = $this->xpath('//input[@type="checkbox" and @disabled="disabled" and @name="modules[system_dependencies_test][enable]"]');
     $this->assertCount(1, $checkbox, 'Checkbox for the module is disabled.');
   }
@@ -78,7 +78,7 @@ class DependencyTest extends ModuleTestBase {
     $this->assertRaw(t('@module (<span class="admin-missing">incompatible with</span> version @version)', [
       '@module' => 'System incompatible module version test (>2.0)',
       '@version' => '1.0',
-    ]), 'A module that depends on an incompatible version of a module is marked as such.');
+    ]));
     $checkbox = $this->xpath('//input[@type="checkbox" and @disabled="disabled" and @name="modules[system_incompatible_module_version_dependencies_test][enable]"]');
     $this->assertCount(1, $checkbox, 'Checkbox for the module is disabled.');
   }
@@ -92,7 +92,7 @@ class DependencyTest extends ModuleTestBase {
     $this->drupalGet('admin/modules');
     $this->assertRaw(t('@module (<span class="admin-missing">incompatible with</span> this version of Drupal core)', [
       '@module' => 'System core incompatible semver test',
-    ]), 'A module that depends on a module with an incompatible core version is marked as such.');
+    ]));
     $checkbox = $this->xpath('//input[@type="checkbox" and @disabled="disabled" and @name="modules[system_incompatible_core_version_dependencies_test][enable]"]');
     $this->assertCount(1, $checkbox, 'Checkbox for the module is disabled.');
   }
@@ -102,7 +102,7 @@ class DependencyTest extends ModuleTestBase {
    */
   public function testIncompatiblePhpVersionDependency() {
     $this->drupalGet('admin/modules');
-    $this->assertRaw('This module requires PHP version 6502.* and is incompatible with PHP version ' . phpversion() . '.', 'User is informed when the PHP dependency requirement of a module is not met.');
+    $this->assertRaw('This module requires PHP version 6502.* and is incompatible with PHP version ' . phpversion() . '.');
     $checkbox = $this->xpath('//input[@type="checkbox" and @disabled="disabled" and @name="modules[system_incompatible_php_version_test][enable]"]');
     $this->assertCount(1, $checkbox, 'Checkbox for the module is disabled.');
   }
diff --git a/core/modules/system/tests/src/Functional/Module/UninstallTest.php b/core/modules/system/tests/src/Functional/Module/UninstallTest.php
index d6cecaa7862..003ec4684f1 100644
--- a/core/modules/system/tests/src/Functional/Module/UninstallTest.php
+++ b/core/modules/system/tests/src/Functional/Module/UninstallTest.php
@@ -123,7 +123,8 @@ class UninstallTest extends BrowserTestBase {
 
     $this->drupalPostForm(NULL, NULL, t('Uninstall'));
     $this->assertText(t('The selected modules have been uninstalled.'), 'Modules status has been updated.');
-    $this->assertNoRaw('&lt;label', 'The page does not have double escaped HTML tags.');
+    // Check that the page does not have double escaped HTML tags.
+    $this->assertNoRaw('&lt;label');
 
     // Make sure our unique cache entry is gone.
     $cached = \Drupal::cache()->get('uninstall_test');
diff --git a/core/modules/system/tests/src/Functional/ParamConverter/UpcastingTest.php b/core/modules/system/tests/src/Functional/ParamConverter/UpcastingTest.php
index 92bbf1e9273..39db03a3870 100644
--- a/core/modules/system/tests/src/Functional/ParamConverter/UpcastingTest.php
+++ b/core/modules/system/tests/src/Functional/ParamConverter/UpcastingTest.php
@@ -36,17 +36,20 @@ class UpcastingTest extends BrowserTestBase {
 
     // paramconverter_test/test_user_node_foo/{user}/{node}/{foo}
     $this->drupalGet("paramconverter_test/test_user_node_foo/" . $user->id() . '/' . $node->id() . "/$foo");
-    $this->assertRaw("user: {$user->label()}, node: {$node->label()}, foo: $foo", 'user and node upcast by entity name');
+    // Verify user and node upcast by entity name.
+    $this->assertRaw("user: {$user->label()}, node: {$node->label()}, foo: $foo");
 
     // paramconverter_test/test_node_user_user/{node}/{foo}/{user}
     // options.parameters.foo.type = entity:user
     $this->drupalGet("paramconverter_test/test_node_user_user/" . $node->id() . "/" . $user->id() . "/" . $user->id());
-    $this->assertRaw("user: {$user->label()}, node: {$node->label()}, foo: {$user->label()}", 'foo converted to user as well');
+    // Verify foo converted to user as well.
+    $this->assertRaw("user: {$user->label()}, node: {$node->label()}, foo: {$user->label()}");
 
     // paramconverter_test/test_node_node_foo/{user}/{node}/{foo}
     // options.parameters.user.type = entity:node
     $this->drupalGet("paramconverter_test/test_node_node_foo/" . $node->id() . "/" . $node->id() . "/$foo");
-    $this->assertRaw("user: {$node->label()}, node: {$node->label()}, foo: $foo", 'user is upcast to node (rather than to user)');
+    // Verify that user is upcast to node (rather than to user).
+    $this->assertRaw("user: {$node->label()}, node: {$node->label()}, foo: $foo");
   }
 
   /**
diff --git a/core/modules/system/tests/src/Functional/Routing/RouterPermissionTest.php b/core/modules/system/tests/src/Functional/Routing/RouterPermissionTest.php
index ebf5b3ac9ed..032d23a165d 100644
--- a/core/modules/system/tests/src/Functional/Routing/RouterPermissionTest.php
+++ b/core/modules/system/tests/src/Functional/Routing/RouterPermissionTest.php
@@ -40,7 +40,7 @@ class RouterPermissionTest extends BrowserTestBase {
     $this->drupalGet('router_test/test7');
     $this->assertSession()->statusCodeEquals(200);
     $this->assertNoRaw('Access denied');
-    $this->assertRaw('test7text', 'The correct string was returned because the route was successful.');
+    $this->assertRaw('test7text');
   }
 
 }
diff --git a/core/modules/system/tests/src/Functional/Routing/RouterTest.php b/core/modules/system/tests/src/Functional/Routing/RouterTest.php
index d6d4423af65..00207c9f9f0 100644
--- a/core/modules/system/tests/src/Functional/Routing/RouterTest.php
+++ b/core/modules/system/tests/src/Functional/Routing/RouterTest.php
@@ -37,7 +37,7 @@ class RouterTest extends BrowserTestBase {
 
     // Confirm that the router can get to a controller.
     $this->drupalGet('router_test/test1');
-    $this->assertRaw('test1', 'The correct string was returned because the route was successful.');
+    $this->assertRaw('test1');
     $session = $this->getSession();
 
     // Check expected headers from FinishResponseSubscriber.
@@ -48,7 +48,7 @@ class RouterTest extends BrowserTestBase {
     $this->assertSession()->responseHeaderDoesNotExist('Vary');
 
     $this->drupalGet('router_test/test2');
-    $this->assertRaw('test2', 'The correct string was returned because the route was successful.');
+    $this->assertRaw('test2');
     // Check expected headers from FinishResponseSubscriber.
     $headers = $session->getResponseHeaders();
     $this->assertSession()->responseHeaderEquals('X-Drupal-Cache-Contexts', implode(' ', $expected_cache_contexts));
@@ -56,7 +56,7 @@ class RouterTest extends BrowserTestBase {
     $this->assertSession()->responseHeaderEquals('X-Drupal-Cache-Max-Age', '-1 (Permanent)');
     // Confirm that the page wrapping is being added, so we're not getting a
     // raw body returned.
-    $this->assertRaw('</html>', 'Page markup was found.');
+    $this->assertRaw('</html>');
     // In some instances, the subrequest handling may get confused and render
     // a page inception style.  This test verifies that is not happening.
     $this->assertSession()->responseNotMatches('#</body>.*</body>#s');
@@ -147,12 +147,12 @@ class RouterTest extends BrowserTestBase {
     foreach ($values as $value) {
       $this->drupalGet('router_test/test3/' . $value);
       $this->assertSession()->statusCodeEquals(200);
-      $this->assertRaw($value, 'The correct string was returned because the route was successful.');
+      $this->assertRaw($value);
     }
 
     // Confirm that the page wrapping is being added, so we're not getting a
     // raw body returned.
-    $this->assertRaw('</html>', 'Page markup was found.');
+    $this->assertRaw('</html>');
 
     // In some instances, the subrequest handling may get confused and render
     // a page inception style.  This test verifies that is not happening.
@@ -165,11 +165,11 @@ class RouterTest extends BrowserTestBase {
   public function testControllerPlaceholdersDefaultValues() {
     $this->drupalGet('router_test/test4');
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw('narf', 'The correct string was returned because the route was successful.');
+    $this->assertRaw('narf');
 
     // Confirm that the page wrapping is being added, so we're not getting a
     // raw body returned.
-    $this->assertRaw('</html>', 'Page markup was found.');
+    $this->assertRaw('</html>');
 
     // In some instances, the subrequest handling may get confused and render
     // a page inception style.  This test verifies that is not happening.
@@ -182,11 +182,11 @@ class RouterTest extends BrowserTestBase {
   public function testControllerPlaceholdersDefaultValuesProvided() {
     $this->drupalGet('router_test/test4/barf');
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw('barf', 'The correct string was returned because the route was successful.');
+    $this->assertRaw('barf');
 
     // Confirm that the page wrapping is being added, so we're not getting a
     // raw body returned.
-    $this->assertRaw('</html>', 'Page markup was found.');
+    $this->assertRaw('</html>');
 
     // In some instances, the subrequest handling may get confused and render
     // a page inception style.  This test verifies that is not happening.
@@ -202,7 +202,7 @@ class RouterTest extends BrowserTestBase {
     // Test the altered route.
     $this->drupalGet('router_test/test6');
     $this->assertSession()->statusCodeEquals(200);
-    $this->assertRaw('test5', 'The correct string was returned because the route was successful.');
+    $this->assertRaw('test5');
   }
 
   /**
@@ -211,11 +211,11 @@ class RouterTest extends BrowserTestBase {
   public function testControllerResolutionPage() {
     $this->drupalGet('/router_test/test10');
 
-    $this->assertRaw('abcde', 'Correct body was found.');
+    $this->assertRaw('abcde');
 
     // Confirm that the page wrapping is being added, so we're not getting a
     // raw body returned.
-    $this->assertRaw('</html>', 'Page markup was found.');
+    $this->assertRaw('</html>');
 
     // In some instances, the subrequest handling may get confused and render
     // a page inception style. This test verifies that is not happening.
@@ -294,7 +294,7 @@ class RouterTest extends BrowserTestBase {
 
     $this->assertSession()->responseHeaderEquals('Content-Type', 'application/json');
 
-    $this->assertRaw('abcde', 'Correct body was found.');
+    $this->assertRaw('abcde');
   }
 
   /**
diff --git a/core/modules/system/tests/src/Functional/Session/SessionTest.php b/core/modules/system/tests/src/Functional/Session/SessionTest.php
index 5536d84576a..b35a20cbae1 100644
--- a/core/modules/system/tests/src/Functional/Session/SessionTest.php
+++ b/core/modules/system/tests/src/Functional/Session/SessionTest.php
@@ -301,7 +301,8 @@ class SessionTest extends BrowserTestBase {
     // from persisting.
     $this->mink->resetSessions();
     $this->drupalGet('session-test/id-from-cookie');
-    $this->assertRaw("session_id:\n", 'Session ID is blank as sent from cookie header.');
+    // Verify that session ID is blank as sent from cookie header.
+    $this->assertRaw("session_id:\n");
     // Assert that we have an anonymous session now.
     $this->drupalGet('session-test/is-logged-in');
     $this->assertSession()->statusCodeEquals(403);
diff --git a/core/modules/system/tests/src/Functional/System/AdminMetaTagTest.php b/core/modules/system/tests/src/Functional/System/AdminMetaTagTest.php
index d17e537b679..82dd89780cb 100644
--- a/core/modules/system/tests/src/Functional/System/AdminMetaTagTest.php
+++ b/core/modules/system/tests/src/Functional/System/AdminMetaTagTest.php
@@ -23,7 +23,7 @@ class AdminMetaTagTest extends BrowserTestBase {
     list($version,) = explode('.', \Drupal::VERSION);
     $string = '<meta name="Generator" content="Drupal ' . $version . ' (https://www.drupal.org)" />';
     $this->drupalGet('node');
-    $this->assertRaw($string, 'Fingerprinting meta tag generated correctly.', 'System');
+    $this->assertRaw($string);
   }
 
 }
diff --git a/core/modules/system/tests/src/Functional/System/DateTimeTest.php b/core/modules/system/tests/src/Functional/System/DateTimeTest.php
index fef916eb69f..3f1bb71fc48 100644
--- a/core/modules/system/tests/src/Functional/System/DateTimeTest.php
+++ b/core/modules/system/tests/src/Functional/System/DateTimeTest.php
@@ -134,7 +134,7 @@ class DateTimeTest extends BrowserTestBase {
     $this->drupalPostForm('admin/config/regional/date-time/formats/manage/' . $date_format_id . '/delete', [], t('Delete'));
     // Verify that the user is redirected to the correct page.
     $this->assertSession()->addressEquals(Url::fromRoute('entity.date_format.collection'));
-    $this->assertRaw(t('The date format %format has been deleted.', ['%format' => $name]), 'Custom date format removed.');
+    $this->assertRaw(t('The date format %format has been deleted.', ['%format' => $name]));
 
     // Make sure the date does not exist in config.
     $date_format = DateFormat::load($date_format_id);
diff --git a/core/modules/system/tests/src/Functional/System/DefaultMobileMetaTagsTest.php b/core/modules/system/tests/src/Functional/System/DefaultMobileMetaTagsTest.php
index 044715b69d1..5fb4a5d4dd1 100644
--- a/core/modules/system/tests/src/Functional/System/DefaultMobileMetaTagsTest.php
+++ b/core/modules/system/tests/src/Functional/System/DefaultMobileMetaTagsTest.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\Tests\system\Functional\System;
 
-use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Tests\BrowserTestBase;
 
 /**
@@ -37,7 +36,7 @@ class DefaultMobileMetaTagsTest extends BrowserTestBase {
   public function testDefaultMetaTagsExist() {
     $this->drupalGet('');
     foreach ($this->defaultMetaTags as $name => $metatag) {
-      $this->assertRaw($metatag, new FormattableMarkup('Default Mobile meta tag "@name" displayed properly.', ['@name' => $name]), 'System');
+      $this->assertRaw($metatag);
     }
   }
 
@@ -48,7 +47,7 @@ class DefaultMobileMetaTagsTest extends BrowserTestBase {
     \Drupal::service('module_installer')->install(['system_module_test']);
     $this->drupalGet('');
     foreach ($this->defaultMetaTags as $name => $metatag) {
-      $this->assertNoRaw($metatag, new FormattableMarkup('Default Mobile meta tag "@name" removed properly.', ['@name' => $name]), 'System');
+      $this->assertNoRaw($metatag);
     }
   }
 
diff --git a/core/modules/system/tests/src/Functional/System/ErrorHandlerTest.php b/core/modules/system/tests/src/Functional/System/ErrorHandlerTest.php
index a3a1a873272..0cc9ad2578c 100644
--- a/core/modules/system/tests/src/Functional/System/ErrorHandlerTest.php
+++ b/core/modules/system/tests/src/Functional/System/ErrorHandlerTest.php
@@ -55,7 +55,7 @@ class ErrorHandlerTest extends BrowserTestBase {
     $this->assertErrorMessage($error_notice);
     $this->assertErrorMessage($error_warning);
     $this->assertErrorMessage($error_user_notice);
-    $this->assertRaw('<pre class="backtrace">', 'Found pre element with backtrace class.');
+    $this->assertRaw('<pre class="backtrace">');
     // Ensure we are escaping but not double escaping.
     $this->assertRaw('&amp;');
     $this->assertNoRaw('&amp;amp;');
@@ -70,7 +70,7 @@ class ErrorHandlerTest extends BrowserTestBase {
     $this->assertErrorMessage($error_notice);
     $this->assertErrorMessage($error_warning);
     $this->assertErrorMessage($error_user_notice);
-    $this->assertNoRaw('<pre class="backtrace">', 'Did not find pre element with backtrace class.');
+    $this->assertNoRaw('<pre class="backtrace">');
 
     // Set error reporting to not collect notices.
     $config->set('error_level', ERROR_REPORTING_DISPLAY_SOME)->save();
@@ -79,7 +79,7 @@ class ErrorHandlerTest extends BrowserTestBase {
     $this->assertNoErrorMessage($error_notice);
     $this->assertErrorMessage($error_warning);
     $this->assertErrorMessage($error_user_notice);
-    $this->assertNoRaw('<pre class="backtrace">', 'Did not find pre element with backtrace class.');
+    $this->assertNoRaw('<pre class="backtrace">');
 
     // Set error reporting to not show any errors.
     $config->set('error_level', ERROR_REPORTING_HIDE)->save();
@@ -89,7 +89,7 @@ class ErrorHandlerTest extends BrowserTestBase {
     $this->assertNoErrorMessage($error_warning);
     $this->assertNoErrorMessage($error_user_notice);
     $this->assertNoMessages();
-    $this->assertNoRaw('<pre class="backtrace">', 'Did not find pre element with backtrace class.');
+    $this->assertNoRaw('<pre class="backtrace">');
   }
 
   /**
@@ -131,8 +131,7 @@ class ErrorHandlerTest extends BrowserTestBase {
     // error message.
     $this->assertSession()->pageTextContains($error_pdo_exception['@message']);
     $error_details = new FormattableMarkup('in %function (line ', $error_pdo_exception);
-    $this->assertRaw($error_details, new FormattableMarkup("Found '@message' in error page.", ['@message' => $error_details]));
-
+    $this->assertRaw($error_details);
     $this->drupalGet('error-test/trigger-renderer-exception');
     $this->assertSession()->statusCodeEquals(500);
     $this->assertErrorMessage($error_renderer_exception);
@@ -154,7 +153,7 @@ class ErrorHandlerTest extends BrowserTestBase {
    */
   public function assertErrorMessage(array $error) {
     $message = new FormattableMarkup('%type: @message in %function (line ', $error);
-    $this->assertRaw($message, new FormattableMarkup('Found error message: @message.', ['@message' => $message]));
+    $this->assertRaw($message);
   }
 
   /**
@@ -162,7 +161,7 @@ class ErrorHandlerTest extends BrowserTestBase {
    */
   public function assertNoErrorMessage(array $error) {
     $message = new FormattableMarkup('%type: @message in %function (line ', $error);
-    $this->assertNoRaw($message, new FormattableMarkup('Did not find error message: @message.', ['@message' => $message]));
+    $this->assertNoRaw($message);
   }
 
   /**
diff --git a/core/modules/system/tests/src/Functional/System/PageTitleTest.php b/core/modules/system/tests/src/Functional/System/PageTitleTest.php
index 85e82ed2c5d..2d66ac8705b 100644
--- a/core/modules/system/tests/src/Functional/System/PageTitleTest.php
+++ b/core/modules/system/tests/src/Functional/System/PageTitleTest.php
@@ -93,15 +93,18 @@ class PageTitleTest extends BrowserTestBase {
     // Load frontpage.
     $this->drupalGet('');
 
-    // Test the title.
-    $this->assertNoRaw($title, 'Check for the lack of the unfiltered version of the title.');
+    // Test the title, checking for the lack of the unfiltered version of the
+    // title.
+    $this->assertNoRaw($title);
     // Add </title> to make sure we're checking the title tag, rather than the
     // first 'heading' on the page.
-    $this->assertRaw($title_filtered . '</title>', 'Check for the filtered version of the title in a <title> tag.');
+    $this->assertRaw($title_filtered . '</title>');
 
     // Test the slogan.
-    $this->assertNoRaw($slogan, 'Check for the unfiltered version of the slogan.');
-    $this->assertRaw($slogan_filtered, 'Check for the filtered version of the slogan.');
+    // Check the unfiltered version of the slogan is missing.
+    $this->assertNoRaw($slogan);
+    // Check for the filtered version of the slogan.
+    $this->assertRaw($slogan_filtered);
   }
 
   /**
diff --git a/core/modules/system/tests/src/Functional/System/SiteMaintenanceTest.php b/core/modules/system/tests/src/Functional/System/SiteMaintenanceTest.php
index 38da8000fec..96d2768b2fd 100644
--- a/core/modules/system/tests/src/Functional/System/SiteMaintenanceTest.php
+++ b/core/modules/system/tests/src/Functional/System/SiteMaintenanceTest.php
@@ -59,7 +59,7 @@ class SiteMaintenanceTest extends BrowserTestBase {
     $permission_label = $permissions['access site in maintenance mode']['title'];
     $permission_message = t('Visitors will only see the maintenance mode message. Only users with the "@permission-label" <a href=":permissions-url">permission</a> will be able to access the site. Authorized users can log in directly via the <a href=":user-login">user login</a> page.', ['@permission-label' => $permission_label, ':permissions-url' => Url::fromRoute('user.admin_permissions')->toString(), ':user-login' => Url::fromRoute('user.login')->toString()]);
     $this->drupalGet(Url::fromRoute('system.site_maintenance_mode'));
-    $this->assertRaw($permission_message, 'Found the permission message.');
+    $this->assertRaw($permission_message);
 
     $this->drupalGet(Url::fromRoute('user.page'));
     // JS should be aggregated, so drupal.js is not in the page source.
@@ -79,7 +79,7 @@ class SiteMaintenanceTest extends BrowserTestBase {
     // JS should not be aggregated, so drupal.js is expected in the page source.
     $links = $this->xpath('//script[contains(@src, :href)]', [':href' => '/core/misc/drupal.js']);
     $this->assertTrue(isset($links[0]), 'script /core/misc/drupal.js in page');
-    $this->assertRaw($admin_message, 'Found the site maintenance mode message.');
+    $this->assertRaw($admin_message);
 
     // Logout and verify that offline message is displayed.
     $this->drupalLogout();
@@ -112,7 +112,7 @@ class SiteMaintenanceTest extends BrowserTestBase {
     $this->drupalLogout();
     $this->drupalLogin($this->adminUser);
     $this->drupalGet('admin/config/development/maintenance');
-    $this->assertNoRaw($admin_message, 'Site maintenance mode message not displayed.');
+    $this->assertNoRaw($admin_message);
 
     $offline_message = 'Sorry, not online.';
     $edit = [
@@ -124,7 +124,7 @@ class SiteMaintenanceTest extends BrowserTestBase {
     $this->drupalLogout();
     $this->drupalGet('');
     $this->assertEqual('Site under maintenance', $this->cssSelect('main h1')[0]->getText());
-    $this->assertRaw($offline_message, 'Found the site offline message.');
+    $this->assertRaw($offline_message);
 
     // Verify that custom site offline message is not displayed on user/password.
     $this->drupalGet('user/password');
diff --git a/core/modules/system/tests/src/Functional/System/ThemeTest.php b/core/modules/system/tests/src/Functional/System/ThemeTest.php
index 2f1aaf7b527..74979bcced8 100644
--- a/core/modules/system/tests/src/Functional/System/ThemeTest.php
+++ b/core/modules/system/tests/src/Functional/System/ThemeTest.php
@@ -291,17 +291,21 @@ class ThemeTest extends BrowserTestBase {
     ];
     $this->drupalPostForm('admin/appearance', $edit, t('Save configuration'));
 
+    // Check that the administration theme is used on an administration page.
     $this->drupalGet('admin/config');
-    $this->assertRaw('core/themes/seven', 'Administration theme used on an administration page.');
+    $this->assertRaw('core/themes/seven');
 
+    // Check that the site default theme used on node page.
     $this->drupalGet('node/' . $this->node->id());
-    $this->assertRaw('core/themes/classy', 'Site default theme used on node page.');
+    $this->assertRaw('core/themes/classy');
 
+    // Check that the administration theme is used on the add content page.
     $this->drupalGet('node/add');
-    $this->assertRaw('core/themes/seven', 'Administration theme used on the add content page.');
+    $this->assertRaw('core/themes/seven');
 
+    // Check that the administration theme is used on the edit content page.
     $this->drupalGet('node/' . $this->node->id() . '/edit');
-    $this->assertRaw('core/themes/seven', 'Administration theme used on the edit content page.');
+    $this->assertRaw('core/themes/seven');
 
     // Disable the admin theme on the node admin pages.
     $edit = [
@@ -309,19 +313,22 @@ class ThemeTest extends BrowserTestBase {
     ];
     $this->drupalPostForm('admin/appearance', $edit, t('Save configuration'));
 
+    // Check that the administration theme is used on an administration page.
     $this->drupalGet('admin/config');
-    $this->assertRaw('core/themes/seven', 'Administration theme used on an administration page.');
+    $this->assertRaw('core/themes/seven');
 
     // Ensure that the admin theme is also visible on the 403 page.
     $normal_user = $this->drupalCreateUser(['view the administration theme']);
     $this->drupalLogin($normal_user);
+    // Check that the administration theme is used on an administration page.
     $this->drupalGet('admin/config');
     $this->assertSession()->statusCodeEquals(403);
-    $this->assertRaw('core/themes/seven', 'Administration theme used on an administration page.');
+    $this->assertRaw('core/themes/seven');
     $this->drupalLogin($this->adminUser);
 
+    // Check that the site default theme used on the add content page.
     $this->drupalGet('node/add');
-    $this->assertRaw('core/themes/classy', 'Site default theme used on the add content page.');
+    $this->assertRaw('core/themes/classy');
 
     // Reset to the default theme settings.
     $edit = [
@@ -330,11 +337,13 @@ class ThemeTest extends BrowserTestBase {
     ];
     $this->drupalPostForm('admin/appearance', $edit, t('Save configuration'));
 
+    // Check that the site default theme used on administration page.
     $this->drupalGet('admin');
-    $this->assertRaw('core/themes/classy', 'Site default theme used on administration page.');
+    $this->assertRaw('core/themes/classy');
 
+    // Check that the site default theme used on the add content page.
     $this->drupalGet('node/add');
-    $this->assertRaw('core/themes/classy', 'Site default theme used on the add content page.');
+    $this->assertRaw('core/themes/classy');
   }
 
   /**
@@ -405,12 +414,12 @@ class ThemeTest extends BrowserTestBase {
     $this->clickLink(t('Set as default'));
 
     // Check that seven cannot be uninstalled as it is the admin theme.
-    $this->assertNoRaw('Uninstall Seven theme', 'A link to uninstall the Seven theme does not appear on the theme settings page.');
+    $this->assertNoRaw('Uninstall Seven theme');
     // Check that bartik cannot be uninstalled as it is the default theme.
-    $this->assertNoRaw('Uninstall Bartik theme', 'A link to uninstall the Bartik theme does not appear on the theme settings page.');
+    $this->assertNoRaw('Uninstall Bartik theme');
     // Check that the classy theme cannot be uninstalled as it is a base theme
     // of seven and bartik.
-    $this->assertNoRaw('Uninstall Classy theme', 'A link to uninstall the Classy theme does not appear on the theme settings page.');
+    $this->assertNoRaw('Uninstall Classy theme');
 
     // Install Stark and set it as the default theme.
     \Drupal::service('theme_installer')->install(['stark']);
@@ -422,20 +431,20 @@ class ThemeTest extends BrowserTestBase {
     $this->drupalPostForm('admin/appearance', $edit, t('Save configuration'));
 
     // Check that seven can be uninstalled now.
-    $this->assertRaw('Uninstall Seven theme', 'A link to uninstall the Seven theme does appear on the theme settings page.');
+    $this->assertRaw('Uninstall Seven theme');
     // Check that the classy theme still cannot be uninstalled as it is a
     // base theme of bartik.
-    $this->assertNoRaw('Uninstall Classy theme', 'A link to uninstall the Classy theme does not appear on the theme settings page.');
+    $this->assertNoRaw('Uninstall Classy theme');
 
     // Change the default theme to stark, stark is second in the list.
     $this->clickLink(t('Set as default'), 1);
 
     // Check that bartik can be uninstalled now.
-    $this->assertRaw('Uninstall Bartik theme', 'A link to uninstall the Bartik theme does appear on the theme settings page.');
+    $this->assertRaw('Uninstall Bartik theme');
 
     // Check that the classy theme still can't be uninstalled as neither of its
     // base themes have been.
-    $this->assertNoRaw('Uninstall Classy theme', 'A link to uninstall the Classy theme does not appear on the theme settings page.');
+    $this->assertNoRaw('Uninstall Classy theme');
 
     // Uninstall each of the three themes starting with Bartik.
     $this->clickLink(t('Uninstall'));
@@ -445,7 +454,7 @@ class ThemeTest extends BrowserTestBase {
     $this->assertRaw('The <em class="placeholder">Seven</em> theme has been uninstalled');
 
     // Check that the classy theme still can't be uninstalled as it is hidden.
-    $this->assertNoRaw('Uninstall Classy theme', 'A link to uninstall the Classy theme does not appear on the theme settings page.');
+    $this->assertNoRaw('Uninstall Classy theme');
   }
 
   /**
diff --git a/core/modules/system/tests/src/Functional/Theme/TwigTransTest.php b/core/modules/system/tests/src/Functional/Theme/TwigTransTest.php
index 85464dcf56a..63686aaebd8 100644
--- a/core/modules/system/tests/src/Functional/Theme/TwigTransTest.php
+++ b/core/modules/system/tests/src/Functional/Theme/TwigTransTest.php
@@ -155,20 +155,17 @@ class TwigTransTest extends BrowserTestBase {
       '{% trans %} with {% plural count = 2 %} was successfully translated.'
     );
 
-    $this->assertRaw(
-      'ESCAPEE: &amp;&quot;&lt;&gt;',
-      '{{ token }} was successfully translated and prefixed with "@".'
-    );
+    // Assert that {{ token }} was successfully translated and prefixed
+    // with "@".
+    $this->assertRaw('ESCAPEE: &amp;&quot;&lt;&gt;');
 
-    $this->assertRaw(
-      'PLAYSHOLDR: <em class="placeholder">&amp;&quot;&lt;&gt;</em>',
-      '{{ token|placeholder }} was successfully translated and prefixed with "%".'
-    );
+    // Assert that {{ token|placeholder }} was successfully translated and
+    // prefixed with "%".
+    $this->assertRaw('PLAYSHOLDR: <em class="placeholder">&amp;&quot;&lt;&gt;</em>');
 
-    $this->assertRaw(
-      'DIS complex token HAZ LENGTH OV: 3. IT CONTAYNZ: <em class="placeholder">12345</em> AN &amp;&quot;&lt;&gt;.',
-      '{{ complex.tokens }} were successfully translated with appropriate prefixes.'
-    );
+    // Assert that {{ complex.tokens }} were successfully translated with
+    // appropriate prefixes.
+    $this->assertRaw('DIS complex token HAZ LENGTH OV: 3. IT CONTAYNZ: <em class="placeholder">12345</em> AN &amp;&quot;&lt;&gt;.');
 
     $this->assertText(
       'I have context.',
@@ -213,7 +210,7 @@ class TwigTransTest extends BrowserTestBase {
 
         // Install the language in Drupal.
         $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add custom language'));
-        $this->assertRaw('"edit-languages-' . $langcode . '-weight"', 'Language code found.');
+        $this->assertRaw('"edit-languages-' . $langcode . '-weight"');
 
         // Import the custom .po contents for the language.
         $filename = $file_system->tempnam('temporary://', "po_") . '.po';
diff --git a/core/modules/taxonomy/tests/src/Functional/RssTest.php b/core/modules/taxonomy/tests/src/Functional/RssTest.php
index 7701e94b61d..0a09eded404 100644
--- a/core/modules/taxonomy/tests/src/Functional/RssTest.php
+++ b/core/modules/taxonomy/tests/src/Functional/RssTest.php
@@ -111,7 +111,7 @@ class RssTest extends TaxonomyTestBase {
       'domain="' . $term1->toUrl('canonical', ['absolute' => TRUE])->toString() . '"',
       $term1->getName()
     );
-    $this->assertRaw($test_element, 'Term is displayed when viewing the rss feed.');
+    $this->assertRaw($test_element);
 
     // Test that the feed icon exists for the term.
     $this->drupalGet("taxonomy/term/{$term1->id()}");
@@ -138,7 +138,7 @@ class RssTest extends TaxonomyTestBase {
     $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
     $raw_xml = '<title>' . $node->label() . '</title>';
     $this->drupalGet('taxonomy/term/all/feed');
-    $this->assertRaw($raw_xml, "Raw text '$raw_xml' is found.");
+    $this->assertRaw($raw_xml);
     // Unpublish the article and check that it is not shown in the feed.
     $node->setUnpublished()->save();
     $this->drupalGet('taxonomy/term/all/feed');
diff --git a/core/modules/taxonomy/tests/src/Functional/TermIndexTest.php b/core/modules/taxonomy/tests/src/Functional/TermIndexTest.php
index 4e9b62c4ef3..f652e67d202 100644
--- a/core/modules/taxonomy/tests/src/Functional/TermIndexTest.php
+++ b/core/modules/taxonomy/tests/src/Functional/TermIndexTest.php
@@ -244,7 +244,8 @@ class TermIndexTest extends TaxonomyTestBase {
     $this->drupalGet('taxonomy/term/' . $term1->id());
     // Breadcrumbs are not rendered with a language, prevent the term
     // language from being added to the options.
-    $this->assertRaw(Link::fromTextAndUrl($term2->getName(), $term2->toUrl('canonical', ['language' => NULL]))->toString(), 'Parent term link is displayed when viewing the node.');
+    // Check that parent term link is displayed when viewing the node.
+    $this->assertRaw(Link::fromTextAndUrl($term2->getName(), $term2->toUrl('canonical', ['language' => NULL]))->toString());
   }
 
 }
diff --git a/core/modules/taxonomy/tests/src/Functional/TermTest.php b/core/modules/taxonomy/tests/src/Functional/TermTest.php
index 793b7266248..5c97ab6a840 100644
--- a/core/modules/taxonomy/tests/src/Functional/TermTest.php
+++ b/core/modules/taxonomy/tests/src/Functional/TermTest.php
@@ -261,7 +261,7 @@ class TermTest extends TaxonomyTestBase {
 
     // Verify the placeholder is there.
     $this->drupalGet('node/add/article');
-    $this->assertRaw('placeholder="Start typing here."', 'Placeholder is present.');
+    $this->assertRaw('placeholder="Start typing here."');
 
     // Preview and verify the terms appear but are not created.
     $this->drupalPostForm(NULL, $edit, t('Preview'));
@@ -345,7 +345,7 @@ class TermTest extends TaxonomyTestBase {
 
     $this->clickLink(t('Edit'));
 
-    $this->assertRaw($edit['name[0][value]'], 'The randomly generated term name is present.');
+    $this->assertRaw($edit['name[0][value]']);
     $this->assertText($edit['description[0][value]'], 'The randomly generated term description is present.');
 
     $edit = [
@@ -577,9 +577,9 @@ class TermTest extends TaxonomyTestBase {
     // Check that the term is displayed when editing and saving the node with no
     // changes.
     $this->clickLink(t('Edit'));
-    $this->assertRaw($term->getName(), 'Term is displayed when editing the node.');
+    $this->assertRaw($term->getName());
     $this->drupalPostForm(NULL, [], t('Save'));
-    $this->assertRaw($term->getName(), 'Term is displayed after saving the node with no changes.');
+    $this->assertRaw($term->getName());
   }
 
   /**
diff --git a/core/modules/taxonomy/tests/src/Functional/ThemeTest.php b/core/modules/taxonomy/tests/src/Functional/ThemeTest.php
index 8462e284302..c5fdc866cc9 100644
--- a/core/modules/taxonomy/tests/src/Functional/ThemeTest.php
+++ b/core/modules/taxonomy/tests/src/Functional/ThemeTest.php
@@ -42,16 +42,22 @@ class ThemeTest extends TaxonomyTestBase {
     // should use the administrative theme.
     $vocabulary = $this->createVocabulary();
     $this->drupalGet('admin/structure/taxonomy/manage/' . $vocabulary->id() . '/add');
-    $this->assertRaw('seven/css/base/elements.css', t("The administrative theme's CSS appears on the page for adding a taxonomy term."));
+    // Check that the administrative theme's CSS appears on the page for adding
+    // a taxonomy term.
+    $this->assertRaw('seven/css/base/elements.css');
 
     // Viewing a taxonomy term should use the default theme.
     $term = $this->createTerm($vocabulary);
     $this->drupalGet('taxonomy/term/' . $term->id());
-    $this->assertRaw('bartik/css/base/elements.css', t("The default theme's CSS appears on the page for viewing a taxonomy term."));
+    // Check that the default theme's CSS appears on the page for viewing
+    // a taxonomy term.
+    $this->assertRaw('bartik/css/base/elements.css');
 
     // Editing a taxonomy term should use the same theme as adding one.
     $this->drupalGet('taxonomy/term/' . $term->id() . '/edit');
-    $this->assertRaw('seven/css/base/elements.css', t("The administrative theme's CSS appears on the page for editing a taxonomy term."));
+    // Check that the administrative theme's CSS appears on the page for editing
+    // a taxonomy term.
+    $this->assertRaw('seven/css/base/elements.css');
   }
 
 }
diff --git a/core/modules/taxonomy/tests/src/Functional/VocabularyPermissionsTest.php b/core/modules/taxonomy/tests/src/Functional/VocabularyPermissionsTest.php
index b7c32e3ab22..d359ed0b7a0 100644
--- a/core/modules/taxonomy/tests/src/Functional/VocabularyPermissionsTest.php
+++ b/core/modules/taxonomy/tests/src/Functional/VocabularyPermissionsTest.php
@@ -264,11 +264,11 @@ class VocabularyPermissionsTest extends TaxonomyTestBase {
 
     // Delete the vocabulary.
     $this->drupalGet('taxonomy/term/' . $term->id() . '/delete');
-    $this->assertRaw(t('Are you sure you want to delete the @entity-type %label?', ['@entity-type' => 'taxonomy term', '%label' => $edit['name[0][value]']]), 'Delete taxonomy term form opened successfully.');
+    $this->assertRaw(t('Are you sure you want to delete the @entity-type %label?', ['@entity-type' => 'taxonomy term', '%label' => $edit['name[0][value]']]));
 
     // Confirm deletion.
     $this->drupalPostForm(NULL, NULL, t('Delete'));
-    $this->assertRaw(t('Deleted term %name.', ['%name' => $edit['name[0][value]']]), 'Term deleted.');
+    $this->assertRaw(t('Deleted term %name.', ['%name' => $edit['name[0][value]']]));
 
     // Test as user with "create" permissions.
     $user = $this->drupalCreateUser(["create terms in {$vocabulary->id()}"]);
@@ -343,11 +343,11 @@ class VocabularyPermissionsTest extends TaxonomyTestBase {
 
     // Delete the vocabulary.
     $this->drupalGet('taxonomy/term/' . $term->id() . '/delete');
-    $this->assertRaw(t('Are you sure you want to delete the @entity-type %label?', ['@entity-type' => 'taxonomy term', '%label' => $term->getName()]), 'Delete taxonomy term form opened successfully.');
+    $this->assertRaw(t('Are you sure you want to delete the @entity-type %label?', ['@entity-type' => 'taxonomy term', '%label' => $term->getName()]));
 
     // Confirm deletion.
     $this->drupalPostForm(NULL, NULL, t('Delete'));
-    $this->assertRaw(t('Deleted term %name.', ['%name' => $term->getName()]), 'Term deleted.');
+    $this->assertRaw(t('Deleted term %name.', ['%name' => $term->getName()]));
 
     // Test as user without proper permissions.
     $user = $this->drupalCreateUser();
diff --git a/core/modules/taxonomy/tests/src/Functional/VocabularyUiTest.php b/core/modules/taxonomy/tests/src/Functional/VocabularyUiTest.php
index aa5e1e806c8..f7a58b02f30 100644
--- a/core/modules/taxonomy/tests/src/Functional/VocabularyUiTest.php
+++ b/core/modules/taxonomy/tests/src/Functional/VocabularyUiTest.php
@@ -47,7 +47,7 @@ class VocabularyUiTest extends TaxonomyTestBase {
     $edit['description'] = $this->randomMachineName();
     $edit['vid'] = $vid;
     $this->drupalPostForm(NULL, $edit, t('Save'));
-    $this->assertRaw(t('Created new vocabulary %name.', ['%name' => $edit['name']]), 'Vocabulary created successfully.');
+    $this->assertRaw(t('Created new vocabulary %name.', ['%name' => $edit['name']]));
 
     // Edit the vocabulary.
     $this->drupalGet('admin/structure/taxonomy');
@@ -150,12 +150,12 @@ class VocabularyUiTest extends TaxonomyTestBase {
     // Delete the vocabulary.
     $this->drupalGet('admin/structure/taxonomy/manage/' . $vocabulary->id());
     $this->clickLink(t('Delete'));
-    $this->assertRaw(t('Are you sure you want to delete the vocabulary %name?', ['%name' => $vocabulary->label()]), '[confirm deletion] Asks for confirmation.');
+    $this->assertRaw(t('Are you sure you want to delete the vocabulary %name?', ['%name' => $vocabulary->label()]));
     $this->assertText(t('Deleting a vocabulary will delete all the terms in it. This action cannot be undone.'), '[confirm deletion] Inform that all terms will be deleted.');
 
     // Confirm deletion.
     $this->drupalPostForm(NULL, NULL, t('Delete'));
-    $this->assertRaw(t('Deleted vocabulary %name.', ['%name' => $vocabulary->label()]), 'Vocabulary deleted.');
+    $this->assertRaw(t('Deleted vocabulary %name.', ['%name' => $vocabulary->label()]));
     $this->container->get('entity_type.manager')->getStorage('taxonomy_vocabulary')->resetCache();
     $this->assertNull(Vocabulary::load($vid), 'Vocabulary not found.');
   }
diff --git a/core/modules/toolbar/tests/src/Functional/ToolbarAdminMenuTest.php b/core/modules/toolbar/tests/src/Functional/ToolbarAdminMenuTest.php
index 6934ed57a75..3a679fc0fee 100644
--- a/core/modules/toolbar/tests/src/Functional/ToolbarAdminMenuTest.php
+++ b/core/modules/toolbar/tests/src/Functional/ToolbarAdminMenuTest.php
@@ -286,7 +286,7 @@ class ToolbarAdminMenuTest extends BrowserTestBase {
     t($name, [], ['langcode' => $langcode]);
     // Reset locale cache.
     $this->container->get('string_translation')->reset();
-    $this->assertRaw('"edit-languages-' . $langcode . '-weight"', 'Language code found.');
+    $this->assertRaw('"edit-languages-' . $langcode . '-weight"');
     $this->assertText(t($name), 'Test language added.');
 
     // Have the adminUser request a page in the new language.
diff --git a/core/modules/update/tests/src/Functional/UpdateContribTest.php b/core/modules/update/tests/src/Functional/UpdateContribTest.php
index a5aab170400..bbd858b896d 100644
--- a/core/modules/update/tests/src/Functional/UpdateContribTest.php
+++ b/core/modules/update/tests/src/Functional/UpdateContribTest.php
@@ -106,7 +106,7 @@ class UpdateContribTest extends UpdateTestBase {
     $this->assertText(t('Up to date'));
     $this->assertRaw('<h3>' . t('Modules') . '</h3>');
     $this->assertNoText('Update available');
-    $this->assertRaw($project_link, 'Link to aaa_update_test project appears.');
+    $this->assertRaw($project_link);
 
     // Since aaa_update_test is installed the fact it is hidden and in the
     // Testing package means it should not appear.
@@ -118,7 +118,7 @@ class UpdateContribTest extends UpdateTestBase {
         'aaa_update_test' => '1_0',
       ]
     );
-    $this->assertNoRaw($project_link, 'Link to aaa_update_test project does not appear.');
+    $this->assertNoRaw($project_link);
 
     // A hidden and installed project not in the Testing package should appear.
     $system_info['aaa_update_test']['package'] = 'aaa_update_test';
@@ -129,7 +129,7 @@ class UpdateContribTest extends UpdateTestBase {
         'aaa_update_test' => '1_0',
       ]
     );
-    $this->assertRaw($project_link, 'Link to aaa_update_test project appears.');
+    $this->assertRaw($project_link);
   }
 
   /**
@@ -190,10 +190,10 @@ class UpdateContribTest extends UpdateTestBase {
     $this->assertText(t('CCC Update test'));
     // We want aaa_update_test included in the ccc_update_test project, not as
     // its own project on the report.
-    $this->assertNoRaw(Link::fromTextAndUrl(t('AAA Update test'), Url::fromUri('http://example.com/project/aaa_update_test'))->toString(), 'Link to aaa_update_test project does not appear.');
+    $this->assertNoRaw(Link::fromTextAndUrl(t('AAA Update test'), Url::fromUri('http://example.com/project/aaa_update_test'))->toString());
     // The other two should be listed as projects.
-    $this->assertRaw(Link::fromTextAndUrl(t('BBB Update test'), Url::fromUri('http://example.com/project/bbb_update_test'))->toString(), 'Link to bbb_update_test project appears.');
-    $this->assertRaw(Link::fromTextAndUrl(t('CCC Update test'), Url::fromUri('http://example.com/project/ccc_update_test'))->toString(), 'Link to bbb_update_test project appears.');
+    $this->assertRaw(Link::fromTextAndUrl(t('BBB Update test'), Url::fromUri('http://example.com/project/bbb_update_test'))->toString());
+    $this->assertRaw(Link::fromTextAndUrl(t('CCC Update test'), Url::fromUri('http://example.com/project/ccc_update_test'))->toString());
 
     // We want to make sure we see the BBB project before the CCC project.
     // Instead of just searching for 'BBB Update test' or something, we want
@@ -240,7 +240,7 @@ class UpdateContribTest extends UpdateTestBase {
     ];
     $this->refreshUpdateStatus($xml_mapping);
     $this->assertText(t('Security update required!'));
-    $this->assertRaw(Link::fromTextAndUrl(t('Update test base theme'), Url::fromUri('http://example.com/project/update_test_basetheme'))->toString(), 'Link to the Update test base theme project appears.');
+    $this->assertRaw(Link::fromTextAndUrl(t('Update test base theme'), Url::fromUri('http://example.com/project/update_test_basetheme'))->toString());
   }
 
   /**
@@ -396,13 +396,13 @@ class UpdateContribTest extends UpdateTestBase {
       $this->assertNoText('Themes');
       if ($check_disabled) {
         $this->assertText(t('Uninstalled themes'));
-        $this->assertRaw($base_theme_project_link, 'Link to the Update test base theme project appears.');
-        $this->assertRaw($sub_theme_project_link, 'Link to the Update test subtheme project appears.');
+        $this->assertRaw($base_theme_project_link);
+        $this->assertRaw($sub_theme_project_link);
       }
       else {
         $this->assertNoText('Uninstalled themes');
-        $this->assertNoRaw($base_theme_project_link, 'Link to the Update test base theme project does not appear.');
-        $this->assertNoRaw($sub_theme_project_link, 'Link to the Update test subtheme project does not appear.');
+        $this->assertNoRaw($base_theme_project_link);
+        $this->assertNoRaw($sub_theme_project_link);
       }
     }
   }
@@ -492,9 +492,9 @@ class UpdateContribTest extends UpdateTestBase {
     $this->assertSession()->pageTextContainsOnce('Failed to get available update data for one project.');
 
     // The other two should be listed as projects.
-    $this->assertRaw(Link::fromTextAndUrl(t('AAA Update test'), Url::fromUri('http://example.com/project/aaa_update_test'))->toString(), 'Link to aaa_update_test project appears.');
-    $this->assertNoRaw(Link::fromTextAndUrl(t('BBB Update test'), Url::fromUri('http://example.com/project/bbb_update_test'))->toString(), 'Link to bbb_update_test project does not appear.');
-    $this->assertRaw(Link::fromTextAndUrl(t('CCC Update test'), Url::fromUri('http://example.com/project/ccc_update_test'))->toString(), 'Link to bbb_update_test project appears.');
+    $this->assertRaw(Link::fromTextAndUrl(t('AAA Update test'), Url::fromUri('http://example.com/project/aaa_update_test'))->toString());
+    $this->assertNoRaw(Link::fromTextAndUrl(t('BBB Update test'), Url::fromUri('http://example.com/project/bbb_update_test'))->toString());
+    $this->assertRaw(Link::fromTextAndUrl(t('CCC Update test'), Url::fromUri('http://example.com/project/ccc_update_test'))->toString());
   }
 
   /**
@@ -539,7 +539,7 @@ class UpdateContribTest extends UpdateTestBase {
     $this->drupalGet('admin/reports/updates');
     $this->assertRaw('<h3>' . t('Modules') . '</h3>');
     $this->assertText(t('Security update required!'));
-    $this->assertRaw(Link::fromTextAndUrl(t('AAA Update test'), Url::fromUri('http://example.com/project/aaa_update_test'))->toString(), 'Link to aaa_update_test project appears.');
+    $this->assertRaw(Link::fromTextAndUrl(t('AAA Update test'), Url::fromUri('http://example.com/project/aaa_update_test'))->toString());
 
     // Visit the reports page again without the altering and make sure the
     // status is back to normal.
@@ -547,7 +547,7 @@ class UpdateContribTest extends UpdateTestBase {
     $this->drupalGet('admin/reports/updates');
     $this->assertRaw('<h3>' . t('Modules') . '</h3>');
     $this->assertNoText('Security update required!');
-    $this->assertRaw(Link::fromTextAndUrl(t('AAA Update test'), Url::fromUri('http://example.com/project/aaa_update_test'))->toString(), 'Link to aaa_update_test project appears.');
+    $this->assertRaw(Link::fromTextAndUrl(t('AAA Update test'), Url::fromUri('http://example.com/project/aaa_update_test'))->toString());
 
     // Turn the altering back on and visit the Update manager UI.
     $update_test_config->set('update_status', $update_status)->save();
diff --git a/core/modules/update/tests/src/Functional/UpdateCoreTest.php b/core/modules/update/tests/src/Functional/UpdateCoreTest.php
index ba68ad21611..63a5b603a5b 100644
--- a/core/modules/update/tests/src/Functional/UpdateCoreTest.php
+++ b/core/modules/update/tests/src/Functional/UpdateCoreTest.php
@@ -88,7 +88,7 @@ class UpdateCoreTest extends UpdateTestBase {
           $this->assertText(t('Up to date'));
           $this->assertNoText('Update available');
           $this->assertNoText('Security update required!');
-          $this->assertRaw('check.svg', 'Check icon was found.');
+          $this->assertRaw('check.svg');
         }
       }
     }
@@ -126,7 +126,7 @@ class UpdateCoreTest extends UpdateTestBase {
               $this->assertText(t('Update available'));
               $this->assertVersionUpdateLinks('Recommended version:', $full_version);
               $this->assertNoText('Latest version:');
-              $this->assertRaw('warning.svg', 'Warning icon was found.');
+              $this->assertRaw('warning.svg');
             }
             // Only unstable releases are available.
             // An unstable release is the latest.
@@ -135,7 +135,7 @@ class UpdateCoreTest extends UpdateTestBase {
               $this->assertNoText('Update available');
               $this->assertNoText('Recommended version:');
               $this->assertVersionUpdateLinks('Latest version:', $full_version);
-              $this->assertRaw('check.svg', 'Check icon was found.');
+              $this->assertRaw('check.svg');
             }
             break;
 
@@ -147,7 +147,7 @@ class UpdateCoreTest extends UpdateTestBase {
               $this->assertText(t('Update available'));
               $this->assertVersionUpdateLinks('Recommended version:', $full_version);
               $this->assertNoText('Latest version:');
-              $this->assertRaw('warning.svg', 'Warning icon was found.');
+              $this->assertRaw('warning.svg');
             }
             // Both stable and unstable releases are available.
             // An unstable release is the latest.
@@ -156,7 +156,7 @@ class UpdateCoreTest extends UpdateTestBase {
               $this->assertText(t('Update available'));
               $this->assertVersionUpdateLinks('Recommended version:', '8.1.0');
               $this->assertVersionUpdateLinks('Latest version:', $full_version);
-              $this->assertRaw('warning.svg', 'Warning icon was found.');
+              $this->assertRaw('warning.svg');
             }
             break;
         }
@@ -178,14 +178,14 @@ class UpdateCoreTest extends UpdateTestBase {
           $this->clickLink(t('Check manually'));
           $this->checkForMetaRefresh();
           $this->assertNoText('Security update required!');
-          $this->assertRaw(Link::fromTextAndUrl('9.0.0', Url::fromUri("http://example.com/drupal-9-0-0-release"))->toString(), 'Link to release appears.');
-          $this->assertRaw(Link::fromTextAndUrl(t('Download'), Url::fromUri("http://example.com/drupal-9-0-0.tar.gz"))->toString(), 'Link to download appears.');
-          $this->assertRaw(Link::fromTextAndUrl(t('Release notes'), Url::fromUri("http://example.com/drupal-9-0-0-release"))->toString(), 'Link to release notes appears.');
+          $this->assertRaw(Link::fromTextAndUrl('9.0.0', Url::fromUri("http://example.com/drupal-9-0-0-release"))->toString());
+          $this->assertRaw(Link::fromTextAndUrl(t('Download'), Url::fromUri("http://example.com/drupal-9-0-0.tar.gz"))->toString());
+          $this->assertRaw(Link::fromTextAndUrl(t('Release notes'), Url::fromUri("http://example.com/drupal-9-0-0-release"))->toString());
           $this->assertNoText('Up to date');
           $this->assertText(t('Not supported!'));
           $this->assertText(t('Recommended version:'));
           $this->assertNoText('Latest version:');
-          $this->assertRaw('error.svg', 'Error icon was found.');
+          $this->assertRaw('error.svg');
         }
       }
     }
diff --git a/core/modules/update/tests/src/Functional/UpdateTestBase.php b/core/modules/update/tests/src/Functional/UpdateTestBase.php
index e1d55cc60ad..effdcab9dad 100644
--- a/core/modules/update/tests/src/Functional/UpdateTestBase.php
+++ b/core/modules/update/tests/src/Functional/UpdateTestBase.php
@@ -107,7 +107,8 @@ abstract class UpdateTestBase extends BrowserTestBase {
    */
   protected function standardTests() {
     $this->assertRaw('<h3>' . t('Drupal core') . '</h3>');
-    $this->assertRaw(Link::fromTextAndUrl(t('Drupal'), Url::fromUri('http://example.com/project/drupal'))->toString(), 'Link to the Drupal project appears.');
+    // Verify that the link to the Drupal project appears.
+    $this->assertRaw(Link::fromTextAndUrl(t('Drupal'), Url::fromUri('http://example.com/project/drupal'))->toString());
     $this->assertNoText('No available releases found');
   }
 
diff --git a/core/modules/user/tests/src/Functional/UserAdminTest.php b/core/modules/user/tests/src/Functional/UserAdminTest.php
index 319220750ed..32bc8d54de1 100644
--- a/core/modules/user/tests/src/Functional/UserAdminTest.php
+++ b/core/modules/user/tests/src/Functional/UserAdminTest.php
@@ -63,7 +63,7 @@ class UserAdminTest extends BrowserTestBase {
 
     // Test for existence of edit link in table.
     $link = $user_a->toLink(t('Edit'), 'edit-form', ['query' => ['destination' => $user_a->toUrl('collection')->toString()]])->toString();
-    $this->assertRaw($link, 'Found user A edit link on admin users page');
+    $this->assertRaw($link);
 
     // Test exposed filter elements.
     foreach (['user', 'role', 'permission', 'status'] as $field) {
@@ -168,7 +168,7 @@ class UserAdminTest extends BrowserTestBase {
     ]);
     $this->drupalLogin($admin_user);
     $this->drupalGet('admin/config/people/accounts');
-    $this->assertRaw('id="edit-mail-notification-address"', 'Notification Email address field exists');
+    $this->assertRaw('id="edit-mail-notification-address"');
     $this->drupalLogout();
 
     // Test custom user registration approval email address(es).
diff --git a/core/modules/user/tests/src/Functional/UserCancelTest.php b/core/modules/user/tests/src/Functional/UserCancelTest.php
index 824274a5f30..f1d7c411e89 100644
--- a/core/modules/user/tests/src/Functional/UserCancelTest.php
+++ b/core/modules/user/tests/src/Functional/UserCancelTest.php
@@ -56,7 +56,7 @@ class UserCancelTest extends BrowserTestBase {
 
     // Attempt to cancel account.
     $this->drupalGet('user/' . $account->id() . '/edit');
-    $this->assertNoRaw(t('Cancel account'), 'No cancel account button displayed.');
+    $this->assertNoRaw(t('Cancel account'));
 
     // Attempt bogus account cancellation request confirmation.
     $timestamp = $account->getLastLoginTime();
@@ -89,7 +89,7 @@ class UserCancelTest extends BrowserTestBase {
     $this->drupalPostForm('user_form_test_cancel/' . $account->id(), [], t('Cancel account'));
 
     // Confirm deletion.
-    $this->assertRaw(t('%name has been deleted.', ['%name' => $account->getAccountName()]), 'User deleted.');
+    $this->assertRaw(t('%name has been deleted.', ['%name' => $account->getAccountName()]));
     $this->assertNull(User::load($account->id()), 'User is not found in the database.');
   }
 
@@ -202,7 +202,7 @@ class UserCancelTest extends BrowserTestBase {
     $this->assertTrue($account->isBlocked(), 'User has been blocked.');
 
     // Confirm that the confirmation message made it through to the end user.
-    $this->assertRaw(t('%name has been disabled.', ['%name' => $account->getAccountName()]), "Confirmation message displayed to user.");
+    $this->assertRaw(t('%name has been disabled.', ['%name' => $account->getAccountName()]));
   }
 
   /**
@@ -259,7 +259,7 @@ class UserCancelTest extends BrowserTestBase {
     $this->assertSession()->addressEquals('');
     $this->assertSession()->statusCodeEquals(200);
     // Confirm that the confirmation message made it through to the end user.
-    $this->assertRaw(t('%name has been disabled.', ['%name' => $account->getAccountName()]), "Confirmation message displayed to user.");
+    $this->assertRaw(t('%name has been disabled.', ['%name' => $account->getAccountName()]));
 
     $user_storage->resetCache([$account->id()]);
     $account = $user_storage->load($account->id());
@@ -326,7 +326,7 @@ class UserCancelTest extends BrowserTestBase {
     $this->drupalGet('user/' . $account->id() . '/edit');
     $this->drupalPostForm(NULL, NULL, t('Cancel account'));
     $this->assertText(t('Are you sure you want to cancel your account?'), 'Confirmation form to cancel account displayed.');
-    $this->assertRaw(t('Your account will be removed and all account information deleted. All of your content will be assigned to the %anonymous-name user.', ['%anonymous-name' => $this->config('user.settings')->get('anonymous')]), 'Informs that all content will be attributed to anonymous account.');
+    $this->assertRaw(t('Your account will be removed and all account information deleted. All of your content will be assigned to the %anonymous-name user.', ['%anonymous-name' => $this->config('user.settings')->get('anonymous')]));
 
     // Confirm account cancellation.
     $timestamp = time();
@@ -356,7 +356,7 @@ class UserCancelTest extends BrowserTestBase {
     $this->assertEqual($test_comment->getAuthorName(), $anonymous_user->getDisplayName(), 'Comment of the user has been attributed to anonymous user name.');
 
     // Confirm that the confirmation message made it through to the end user.
-    $this->assertRaw(t('%name has been deleted.', ['%name' => $account->getAccountName()]), "Confirmation message displayed to user.");
+    $this->assertRaw(t('%name has been deleted.', ['%name' => $account->getAccountName()]));
   }
 
   /**
@@ -386,7 +386,7 @@ class UserCancelTest extends BrowserTestBase {
     $this->drupalGet('user/' . $account->id() . '/edit');
     $this->drupalPostForm(NULL, NULL, t('Cancel account'));
     $this->assertText(t('Are you sure you want to cancel your account?'), 'Confirmation form to cancel account displayed.');
-    $this->assertRaw(t('Your account will be removed and all account information deleted. All of your content will be assigned to the %anonymous-name user.', ['%anonymous-name' => $this->config('user.settings')->get('anonymous')]), 'Informs that all content will be attributed to anonymous account.');
+    $this->assertRaw(t('Your account will be removed and all account information deleted. All of your content will be assigned to the %anonymous-name user.', ['%anonymous-name' => $this->config('user.settings')->get('anonymous')]));
 
     // Confirm account cancellation.
     $timestamp = time();
@@ -479,7 +479,7 @@ class UserCancelTest extends BrowserTestBase {
     $this->assertNull(Comment::load($comment->id()), 'Comment of the user has been deleted.');
 
     // Confirm that the confirmation message made it through to the end user.
-    $this->assertRaw(t('%name has been deleted.', ['%name' => $account->getAccountName()]), "Confirmation message displayed to user.");
+    $this->assertRaw(t('%name has been deleted.', ['%name' => $account->getAccountName()]));
   }
 
   /**
@@ -498,12 +498,12 @@ class UserCancelTest extends BrowserTestBase {
     // Delete regular user.
     $this->drupalGet('user/' . $account->id() . '/edit');
     $this->drupalPostForm(NULL, NULL, t('Cancel account'));
-    $this->assertRaw(t('Are you sure you want to cancel the account %name?', ['%name' => $account->getAccountName()]), 'Confirmation form to cancel account displayed.');
+    $this->assertRaw(t('Are you sure you want to cancel the account %name?', ['%name' => $account->getAccountName()]));
     $this->assertText(t('Select the method to cancel the account above.'), 'Allows to select account cancellation method.');
 
     // Confirm deletion.
     $this->drupalPostForm(NULL, NULL, t('Cancel account'));
-    $this->assertRaw(t('%name has been deleted.', ['%name' => $account->getAccountName()]), 'User deleted.');
+    $this->assertRaw(t('%name has been deleted.', ['%name' => $account->getAccountName()]));
     $this->assertNull(User::load($account->id()), 'User is not found in the database.');
   }
 
@@ -526,12 +526,12 @@ class UserCancelTest extends BrowserTestBase {
     // Delete regular user without email address.
     $this->drupalGet('user/' . $account->id() . '/edit');
     $this->drupalPostForm(NULL, NULL, t('Cancel account'));
-    $this->assertRaw(t('Are you sure you want to cancel the account %name?', ['%name' => $account->getAccountName()]), 'Confirmation form to cancel account displayed.');
+    $this->assertRaw(t('Are you sure you want to cancel the account %name?', ['%name' => $account->getAccountName()]));
     $this->assertText(t('Select the method to cancel the account above.'), 'Allows to select account cancellation method.');
 
     // Confirm deletion.
     $this->drupalPostForm(NULL, NULL, t('Cancel account'));
-    $this->assertRaw(t('%name has been deleted.', ['%name' => $account->getAccountName()]), 'User deleted.');
+    $this->assertRaw(t('%name has been deleted.', ['%name' => $account->getAccountName()]));
     $this->assertNull(User::load($account->id()), 'User is not found in the database.');
   }
 
diff --git a/core/modules/user/tests/src/Functional/UserCreateTest.php b/core/modules/user/tests/src/Functional/UserCreateTest.php
index fef1a53b05a..c9385520fbb 100644
--- a/core/modules/user/tests/src/Functional/UserCreateTest.php
+++ b/core/modules/user/tests/src/Functional/UserCreateTest.php
@@ -81,18 +81,18 @@ class UserCreateTest extends BrowserTestBase {
     $this->assertFieldByXPath('//input[@type="radio" and @id="edit-status-1" and @checked="checked"]', NULL, 'Default setting for user status is active.');
 
     // Test that browser autocomplete behavior does not occur.
-    $this->assertNoRaw('data-user-info-from-browser', 'Ensure form attribute, data-user-info-from-browser, does not exist.');
+    $this->assertNoRaw('data-user-info-from-browser');
 
     // Test that the password strength indicator displays.
     $config = $this->config('user.settings');
 
     $config->set('password_strength', TRUE)->save();
     $this->drupalGet('admin/people/create');
-    $this->assertRaw(t('Password strength:'), 'The password strength indicator is displayed.');
+    $this->assertRaw(t('Password strength:'));
 
     $config->set('password_strength', FALSE)->save();
     $this->drupalGet('admin/people/create');
-    $this->assertNoRaw(t('Password strength:'), 'The password strength indicator is not displayed.');
+    $this->assertNoRaw(t('Password strength:'));
 
     // We create two users, notifying one and not notifying the other, to
     // ensure that the tests work in both cases.
diff --git a/core/modules/user/tests/src/Functional/UserEditTest.php b/core/modules/user/tests/src/Functional/UserEditTest.php
index f15597c4848..29585b40883 100644
--- a/core/modules/user/tests/src/Functional/UserEditTest.php
+++ b/core/modules/user/tests/src/Functional/UserEditTest.php
@@ -94,11 +94,11 @@ class UserEditTest extends BrowserTestBase {
 
     $config->set('password_strength', TRUE)->save();
     $this->drupalPostForm("user/" . $user1->id() . "/edit", $edit, t('Save'));
-    $this->assertRaw(t('Password strength:'), 'The password strength indicator is displayed.');
+    $this->assertRaw(t('Password strength:'));
 
     $config->set('password_strength', FALSE)->save();
     $this->drupalPostForm("user/" . $user1->id() . "/edit", $edit, t('Save'));
-    $this->assertNoRaw(t('Password strength:'), 'The password strength indicator is not displayed.');
+    $this->assertNoRaw(t('Password strength:'));
 
     // Check that the user status field has the correct value and that it is
     // properly displayed.
diff --git a/core/modules/user/tests/src/Functional/UserPasswordResetTest.php b/core/modules/user/tests/src/Functional/UserPasswordResetTest.php
index 25d4c8ad33f..66f2adb812b 100644
--- a/core/modules/user/tests/src/Functional/UserPasswordResetTest.php
+++ b/core/modules/user/tests/src/Functional/UserPasswordResetTest.php
@@ -167,7 +167,7 @@ class UserPasswordResetTest extends BrowserTestBase {
     $before = count($this->drupalGetMails(['id' => 'user_password_reset']));
     $edit = ['name' => $blocked_account->getAccountName()];
     $this->drupalPostForm(NULL, $edit, t('Submit'));
-    $this->assertRaw(t('%name is blocked or has not been activated yet.', ['%name' => $blocked_account->getAccountName()]), 'Notified user blocked accounts can not request a new password');
+    $this->assertRaw(t('%name is blocked or has not been activated yet.', ['%name' => $blocked_account->getAccountName()]));
     $this->assertCount($before, $this->drupalGetMails(['id' => 'user_password_reset']), 'No email was sent when requesting password reset for a blocked account');
 
     // Verify a password reset link is invalidated when the user's email address changes.
diff --git a/core/modules/user/tests/src/Functional/UserPictureTest.php b/core/modules/user/tests/src/Functional/UserPictureTest.php
index e0016080907..7f1f38e716a 100644
--- a/core/modules/user/tests/src/Functional/UserPictureTest.php
+++ b/core/modules/user/tests/src/Functional/UserPictureTest.php
@@ -72,7 +72,7 @@ class UserPictureTest extends BrowserTestBase {
 
     // Verify that the image is displayed on the user account page.
     $this->drupalGet('user');
-    $this->assertRaw(StreamWrapperManager::getTarget($file->getFileUri()), 'User picture found on user account page.');
+    $this->assertRaw(StreamWrapperManager::getTarget($file->getFileUri()));
 
     // Delete the picture.
     $edit = [];
@@ -143,7 +143,7 @@ class UserPictureTest extends BrowserTestBase {
       ->save();
 
     $this->drupalGet('node/' . $node->id());
-    $this->assertNoRaw(StreamWrapperManager::getTarget($file->getFileUri()), 'User picture not found on node and comment.');
+    $this->assertNoRaw(StreamWrapperManager::getTarget($file->getFileUri()));
   }
 
   /**
diff --git a/core/modules/user/tests/src/Functional/UserRegistrationTest.php b/core/modules/user/tests/src/Functional/UserRegistrationTest.php
index 77d53a8f0a4..76cf00caf24 100644
--- a/core/modules/user/tests/src/Functional/UserRegistrationTest.php
+++ b/core/modules/user/tests/src/Functional/UserRegistrationTest.php
@@ -338,12 +338,12 @@ class UserRegistrationTest extends BrowserTestBase {
     $edit['test_user_field[0][value]'] = '';
     $this->drupalPostForm(NULL, $edit, t('Create new account'));
     $this->assertRegistrationFormCacheTagsWithUserFields();
-    $this->assertRaw(t('@name field is required.', ['@name' => $field->label()]), 'Field validation error was correctly reported.');
+    $this->assertRaw(t('@name field is required.', ['@name' => $field->label()]));
     // Invalid input.
     $edit['test_user_field[0][value]'] = '-1';
     $this->drupalPostForm(NULL, $edit, t('Create new account'));
     $this->assertRegistrationFormCacheTagsWithUserFields();
-    $this->assertRaw(t('%name does not accept the value -1.', ['%name' => $field->label()]), 'Field validation error was correctly reported.');
+    $this->assertRaw(t('%name does not accept the value -1.', ['%name' => $field->label()]));
 
     // Submit with valid data.
     $value = rand(1, 255);
diff --git a/core/modules/user/tests/src/Functional/UserRoleAdminTest.php b/core/modules/user/tests/src/Functional/UserRoleAdminTest.php
index 56242c5db5f..58b9de6126a 100644
--- a/core/modules/user/tests/src/Functional/UserRoleAdminTest.php
+++ b/core/modules/user/tests/src/Functional/UserRoleAdminTest.php
@@ -73,7 +73,7 @@ class UserRoleAdminTest extends BrowserTestBase {
 
     // Try adding a duplicate role.
     $this->drupalPostForm('admin/people/roles/add', $edit, t('Save'));
-    $this->assertRaw(t('The machine-readable name is already in use. It must be unique.'), 'Duplicate role warning displayed.');
+    $this->assertRaw(t('The machine-readable name is already in use. It must be unique.'));
 
     // Test renaming a role.
     $role_name = '456';
diff --git a/core/modules/user/tests/src/Functional/Views/BulkFormTest.php b/core/modules/user/tests/src/Functional/Views/BulkFormTest.php
index 20335a17ec8..ec15ddca383 100644
--- a/core/modules/user/tests/src/Functional/Views/BulkFormTest.php
+++ b/core/modules/user/tests/src/Functional/Views/BulkFormTest.php
@@ -83,7 +83,7 @@ class BulkFormTest extends UserTestBase {
 
     // Block a user using the bulk form.
     $this->assertTrue($account->isActive(), 'The user is not blocked.');
-    $this->assertRaw($account->label(), 'The user is found in the table.');
+    $this->assertRaw($account->label());
     $edit = [
       'user_bulk_form[1]' => TRUE,
       'action' => 'user_block_user_action',
@@ -93,7 +93,7 @@ class BulkFormTest extends UserTestBase {
     $user_storage->resetCache([$account->id()]);
     $account = $user_storage->load($account->id());
     $this->assertTrue($account->isBlocked(), 'The user is blocked.');
-    $this->assertNoRaw($account->label(), 'The user is not found in the table.');
+    $this->assertNoRaw($account->label());
 
     // Remove the user status filter from the view.
     $view = Views::getView('test_user_bulk_form');
diff --git a/core/modules/views/tests/src/Functional/Plugin/ArgumentDefaultTest.php b/core/modules/views/tests/src/Functional/Plugin/ArgumentDefaultTest.php
index a446bafc1c9..92d0a7c2790 100644
--- a/core/modules/views/tests/src/Functional/Plugin/ArgumentDefaultTest.php
+++ b/core/modules/views/tests/src/Functional/Plugin/ArgumentDefaultTest.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\Tests\views\Functional\Plugin;
 
-use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Core\Url;
 use Drupal\node\Entity\Node;
 use Drupal\node\Entity\NodeType;
@@ -111,7 +110,7 @@ class ArgumentDefaultTest extends ViewTestBase {
       '%function' => 'views_handler_argument->validateOptionsForm()',
     ];
     $message = t('%type: @message in %function', $error);
-    $this->assertNoRaw($message, new FormattableMarkup('Did not find error message: @message.', ['@message' => $message]));
+    $this->assertNoRaw($message);
   }
 
   /**
diff --git a/core/modules/views/tests/src/Functional/Plugin/ExposedFormTest.php b/core/modules/views/tests/src/Functional/Plugin/ExposedFormTest.php
index 81ec1bf0906..20f4e1fcfac 100644
--- a/core/modules/views/tests/src/Functional/Plugin/ExposedFormTest.php
+++ b/core/modules/views/tests/src/Functional/Plugin/ExposedFormTest.php
@@ -219,7 +219,7 @@ class ExposedFormTest extends ViewTestBase {
 
     // Test that the custom block label is found.
     $this->drupalGet('test_exposed_block');
-    $this->assertRaw('<strong>Custom</strong> titlealert("hacked!");', 'Custom block title found.');
+    $this->assertRaw('<strong>Custom</strong> titlealert("hacked!");');
 
     // Set label to hidden on the exposed filter form block.
     $block->getPlugin()->setConfigurationValue('label_display', FALSE);
@@ -227,7 +227,7 @@ class ExposedFormTest extends ViewTestBase {
 
     // Test that the label is removed.
     $this->drupalGet('test_exposed_block');
-    $this->assertNoRaw('<strong>Custom</strong> titlealert("hacked!");', 'Custom title was not displayed.');
+    $this->assertNoRaw('<strong>Custom</strong> titlealert("hacked!");');
     $this->assertNoText($view->getTitle(), 'Block title was not displayed.');
 
     // Test there is an exposed form in a block.
@@ -398,15 +398,17 @@ class ExposedFormTest extends ViewTestBase {
     $this->assertSession()->statusCodeEquals(200);
     $form = $this->cssSelect('form.views-exposed-form');
     $this->assertNotEmpty($form, 'The exposed form element was found.');
-    $this->assertRaw(t('Apply'), 'Ensure the exposed form is rendered before submitting the normal form.');
-    $this->assertRaw('<div class="views-row">', 'Views result shown.');
+    // Ensure the exposed form is rendered before submitting the normal form.
+    $this->assertRaw(t('Apply'));
+    $this->assertRaw('<div class="views-row">');
 
     $this->drupalPostForm(NULL, [], t('Submit'));
     $this->assertSession()->statusCodeEquals(200);
     $form = $this->cssSelect('form.views-exposed-form');
     $this->assertNotEmpty($form, 'The exposed form element was found.');
-    $this->assertRaw(t('Apply'), 'Ensure the exposed form is rendered after submitting the normal form.');
-    $this->assertRaw('<div class="views-row">', 'Views result shown.');
+    // Ensure the exposed form is rendered after submitting the normal form.
+    $this->assertRaw(t('Apply'));
+    $this->assertRaw('<div class="views-row">');
   }
 
   /**
diff --git a/core/modules/views/tests/src/Functional/Plugin/StyleTableTest.php b/core/modules/views/tests/src/Functional/Plugin/StyleTableTest.php
index 8add47390b2..46b665a22d6 100644
--- a/core/modules/views/tests/src/Functional/Plugin/StyleTableTest.php
+++ b/core/modules/views/tests/src/Functional/Plugin/StyleTableTest.php
@@ -210,7 +210,7 @@ class StyleTableTest extends ViewTestBase {
     ];
 
     // Ensure that we don't find the caption containing unsafe markup.
-    $this->assertNoRaw($unsafe_markup, "Didn't find caption containing unsafe markup.");
+    $this->assertNoRaw($unsafe_markup);
     // Ensure that the summary isn't shown.
     $this->assertEmpty($this->xpath('//caption/details'));
 
@@ -234,7 +234,7 @@ class StyleTableTest extends ViewTestBase {
     ];
 
     // Ensure that we don't find the caption containing unsafe markup.
-    $this->assertNoRaw($unsafe_markup, "Didn't find caption containing unsafe markup.");
+    $this->assertNoRaw($unsafe_markup);
 
     // Ensure that all expected captions are found.
     foreach ($expected_captions as $raw_caption) {
diff --git a/core/modules/views/tests/src/Functional/ViewsEscapingTest.php b/core/modules/views/tests/src/Functional/ViewsEscapingTest.php
index 46a40705971..af16703094b 100644
--- a/core/modules/views/tests/src/Functional/ViewsEscapingTest.php
+++ b/core/modules/views/tests/src/Functional/ViewsEscapingTest.php
@@ -82,8 +82,8 @@ class ViewsEscapingTest extends ViewTestBase {
     // Test with a field header label having a XSS test as a wrapper.
     $this->drupalGet('test_field_header_xss');
 
-    // Assert that XSS test is escaped.
-    $this->assertNoRaw('<script>alert("XSS")</script>', 'Harmful tags are escaped in header label.');
+    // Assert that harmful tags are escaped in header label.
+    $this->assertNoRaw('<script>alert("XSS")</script>');
   }
 
 }
diff --git a/core/modules/views/tests/src/Functional/ViewsThemeIntegrationTest.php b/core/modules/views/tests/src/Functional/ViewsThemeIntegrationTest.php
index cd6b9985779..2f2bba3991f 100644
--- a/core/modules/views/tests/src/Functional/ViewsThemeIntegrationTest.php
+++ b/core/modules/views/tests/src/Functional/ViewsThemeIntegrationTest.php
@@ -61,8 +61,8 @@ class ViewsThemeIntegrationTest extends ViewTestBase {
     // Make sure a views rendered page is touched.
     $this->drupalGet('test_page_display_200');
 
-    $this->assertRaw("test_basetheme_views_pre_render", "Views title changed by test_basetheme.test_basetheme_views_pre_render");
-    $this->assertRaw("test_basetheme_views_post_render", "Views title changed by test_basetheme.test_basetheme_views_post_render");
+    $this->assertRaw("test_basetheme_views_pre_render");
+    $this->assertRaw("test_basetheme_views_post_render");
 
     // Make sub theme default to test for hook invocation
     // from both sub and base theme.
@@ -74,13 +74,14 @@ class ViewsThemeIntegrationTest extends ViewTestBase {
     // Make sure a views rendered page is touched.
     $this->drupalGet('test_page_display_200');
 
-    $this->assertRaw("test_subtheme_views_pre_render", "Views title changed by test_subtheme.test_subtheme_views_pre_render");
-    $this->assertRaw("test_subtheme_views_post_render", "Views title changed by test_subtheme.test_subtheme_views_post_render");
+    $this->assertRaw("test_subtheme_views_pre_render");
+    $this->assertRaw("test_subtheme_views_post_render");
 
-    $this->assertRaw("test_basetheme_views_pre_render", "Views title changed by test_basetheme.test_basetheme_views_pre_render");
-    $this->assertRaw("test_basetheme_views_post_render", "Views title changed by test_basetheme.test_basetheme_views_post_render");
+    $this->assertRaw("test_basetheme_views_pre_render");
+    $this->assertRaw("test_basetheme_views_post_render");
 
-    $this->assertRaw('<em class="placeholder">' . count($this->dataSet()) . '</em> items found.', 'Views group title added by test_subtheme.test_subtheme_views_post_render');
+    // Verify that the views group title is added.
+    $this->assertRaw('<em class="placeholder">' . count($this->dataSet()) . '</em> items found.');
   }
 
 }
diff --git a/core/modules/views_ui/tests/src/Functional/ExposedFormUITest.php b/core/modules/views_ui/tests/src/Functional/ExposedFormUITest.php
index ac5bc976f97..3f1fc6431fb 100644
--- a/core/modules/views_ui/tests/src/Functional/ExposedFormUITest.php
+++ b/core/modules/views_ui/tests/src/Functional/ExposedFormUITest.php
@@ -266,12 +266,8 @@ class ExposedFormUITest extends UITestBase {
    */
   protected function assertNoGroupedFilterErrors($message = '', $group = 'Other') {
     foreach ($this->groupFormUiErrors as $error) {
-      $err_message = $message;
-      if (empty($err_message)) {
-        $err_message = "Verify that '$error' is not in the HTML output.";
-      }
       if (empty($message)) {
-        return $this->assertNoRaw($error, $err_message, $group);
+        return $this->assertNoRaw($error);
       }
     }
     return TRUE;
diff --git a/core/modules/views_ui/tests/src/Functional/FilterUITest.php b/core/modules/views_ui/tests/src/Functional/FilterUITest.php
index f6fb198f44c..48da80f5f02 100644
--- a/core/modules/views_ui/tests/src/Functional/FilterUITest.php
+++ b/core/modules/views_ui/tests/src/Functional/FilterUITest.php
@@ -79,7 +79,7 @@ class FilterUITest extends UITestBase {
 
     // Tests that we can create a new filter group from UI.
     $this->drupalGet('admin/structure/views/nojs/rearrange-filter/test_filter_groups/page');
-    $this->assertNoRaw('<span>Group 3</span>', 'Group 3 has not been added yet.');
+    $this->assertNoRaw('<span>Group 3</span>');
 
     // Create 2 new groups.
     $this->drupalPostForm(NULL, [], t('Create new filter group'));
@@ -89,13 +89,13 @@ class FilterUITest extends UITestBase {
     $this->drupalPostForm(NULL, [], t('Remove group 3'));
 
     // Verify that the group 4 is now named as 3.
-    $this->assertRaw('<span>Group 3</span>', 'Group 3 still exists.');
+    $this->assertRaw('<span>Group 3</span>');
 
     // Remove the group 3 again.
     $this->drupalPostForm(NULL, [], t('Remove group 3'));
 
     // Group 3 now does not exist.
-    $this->assertNoRaw('<span>Group 3</span>', 'Group 3 has not been added yet.');
+    $this->assertNoRaw('<span>Group 3</span>');
   }
 
   /**
diff --git a/core/modules/views_ui/tests/src/Functional/HandlerTest.php b/core/modules/views_ui/tests/src/Functional/HandlerTest.php
index f44441d2010..6fa939bc7ab 100644
--- a/core/modules/views_ui/tests/src/Functional/HandlerTest.php
+++ b/core/modules/views_ui/tests/src/Functional/HandlerTest.php
@@ -269,7 +269,7 @@ class HandlerTest extends UITestBase {
     // description field is shown instead.
     $this->drupalGet('admin/structure/views/nojs/add-handler/test_node_view/default/field');
     $this->assertNoText('Error: missing help');
-    $this->assertRaw('<td class="description"></td>', 'Empty description found');
+    $this->assertRaw('<td class="description"></td>');
 
     // Test that no error message is shown for other fields.
     $this->drupalGet('admin/structure/views/nojs/add-handler/test_view_empty/default/field');
diff --git a/core/modules/views_ui/tests/src/Functional/PreviewTest.php b/core/modules/views_ui/tests/src/Functional/PreviewTest.php
index 618aafe50c9..458e4d63368 100644
--- a/core/modules/views_ui/tests/src/Functional/PreviewTest.php
+++ b/core/modules/views_ui/tests/src/Functional/PreviewTest.php
@@ -148,7 +148,7 @@ SQL;
     $this->assertCount(1, $elements, 'Views Query Preview Info area altered.');
     // Check that additional assets are attached.
     $this->assertStringContainsString('views_ui_test/views_ui_test.test', $this->getDrupalSettings()['ajaxPageState']['libraries'], 'Attached library found.');
-    $this->assertRaw('css/views_ui_test.test.css', 'Attached CSS asset found.');
+    $this->assertRaw('css/views_ui_test.test.css');
   }
 
   /**
diff --git a/core/modules/views_ui/tests/src/Functional/ReportFieldsTest.php b/core/modules/views_ui/tests/src/Functional/ReportFieldsTest.php
index 6dd8003a1e8..98d0077c51e 100644
--- a/core/modules/views_ui/tests/src/Functional/ReportFieldsTest.php
+++ b/core/modules/views_ui/tests/src/Functional/ReportFieldsTest.php
@@ -32,8 +32,8 @@ class ReportFieldsTest extends UITestBase {
    */
   public function testReportFields() {
     $this->drupalGet('admin/reports/fields/views-fields');
-    $this->assertRaw('Used in views', 'Title appears correctly');
-    $this->assertRaw('No fields have been used in views yet.', 'No results message appears correctly.');
+    $this->assertRaw('Used in views');
+    $this->assertRaw('No fields have been used in views yet.');
 
     // Set up the field_test field.
     $field_storage = FieldStorageConfig::create([
@@ -50,11 +50,11 @@ class ReportFieldsTest extends UITestBase {
     ]);
     $field->save();
 
-    $this->drupalGet('admin/reports/fields/views-fields');
     // Assert that the newly created field appears in the overview.
-    $this->assertRaw('<td>field_test</td>', 'Field name appears correctly');
-    $this->assertRaw('>test_field_field_test</a>', 'View name appears correctly');
-    $this->assertRaw('Used in views', 'Title appears correctly');
+    $this->drupalGet('admin/reports/fields/views-fields');
+    $this->assertRaw('<td>field_test</td>');
+    $this->assertRaw('>test_field_field_test</a>');
+    $this->assertRaw('Used in views');
   }
 
 }
diff --git a/core/profiles/standard/tests/src/Functional/StandardTest.php b/core/profiles/standard/tests/src/Functional/StandardTest.php
index 54b3861ee4b..15aedda84b8 100644
--- a/core/profiles/standard/tests/src/Functional/StandardTest.php
+++ b/core/profiles/standard/tests/src/Functional/StandardTest.php
@@ -87,7 +87,8 @@ class StandardTest extends BrowserTestBase {
     // Add a comment.
     $this->drupalLogin($this->adminUser);
     $this->drupalGet('node/1');
-    $this->assertRaw('Then she picked out two somebodies,<br />Sally and me', 'Found a line break.');
+    // Verify that a line break is present.
+    $this->assertRaw('Then she picked out two somebodies,<br />Sally and me');
     $this->drupalPostForm(NULL, [
       'subject[0][value]' => 'Barfoo',
       'comment_body[0][value]' => 'Then she picked out two somebodies, Sally and me',
diff --git a/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php b/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
index 322fd30a1e0..479113323fa 100644
--- a/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
+++ b/core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php
@@ -364,6 +364,9 @@ trait AssertLegacyTrait {
    */
   protected function assertRaw($raw) {
     @trigger_error('AssertLegacyTrait::assertRaw() is deprecated in drupal:8.2.0 and is removed from drupal:10.0.0. Use $this->assertSession()->responseContains() instead. See https://www.drupal.org/node/3129738', E_USER_DEPRECATED);
+    if (func_num_args() > 1) {
+      @trigger_error('Calling AssertLegacyTrait::assertRaw() with more that one argument is deprecated in drupal:8.2.0 and the method is removed from drupal:10.0.0. Use $this->assertSession()->responseContains() instead. See https://www.drupal.org/node/3129738', E_USER_DEPRECATED);
+    }
     $this->assertSession()->responseContains($raw);
   }
 
@@ -382,6 +385,9 @@ trait AssertLegacyTrait {
    */
   protected function assertNoRaw($raw) {
     @trigger_error('AssertLegacyTrait::assertNoRaw() is deprecated in drupal:8.2.0 and is removed from drupal:10.0.0. Use $this->assertSession()->responseNotContains() instead. See https://www.drupal.org/node/3129738', E_USER_DEPRECATED);
+    if (func_num_args() > 1) {
+      @trigger_error('Calling AssertLegacyTrait::assertNoRaw() with more that one argument is deprecated in drupal:8.2.0 and the method is removed from drupal:10.0.0. Use $this->assertSession()->responseContains() instead. See https://www.drupal.org/node/3129738', E_USER_DEPRECATED);
+    }
     $this->assertSession()->responseNotContains($raw);
   }
 
diff --git a/core/tests/Drupal/FunctionalTests/Installer/SiteNameTest.php b/core/tests/Drupal/FunctionalTests/Installer/SiteNameTest.php
index 44087f2004e..48cafa3d99c 100644
--- a/core/tests/Drupal/FunctionalTests/Installer/SiteNameTest.php
+++ b/core/tests/Drupal/FunctionalTests/Installer/SiteNameTest.php
@@ -38,7 +38,7 @@ class SiteNameTest extends BrowserTestBase {
    */
   public function testSiteName() {
     $this->drupalGet('');
-    $this->assertRaw($this->siteName, 'The site name that was set during the installation appears on the front page after installation.');
+    $this->assertRaw($this->siteName);
   }
 
 }
diff --git a/core/tests/Drupal/Tests/Core/Assert/AssertLegacyTraitTest.php b/core/tests/Drupal/Tests/Core/Assert/AssertLegacyTraitTest.php
index 611eec976e1..ec29f50deb4 100644
--- a/core/tests/Drupal/Tests/Core/Assert/AssertLegacyTraitTest.php
+++ b/core/tests/Drupal/Tests/Core/Assert/AssertLegacyTraitTest.php
@@ -54,6 +54,24 @@ class AssertLegacyTraitTest extends UnitTestCase {
     $this->webAssert = $this->prophesize(WebAssert::class);
   }
 
+  /**
+   * @covers ::assertRaw
+   * @expectedDeprecation Calling AssertLegacyTrait::assertRaw() with more that one argument is deprecated in drupal:8.2.0 and the method is removed from drupal:10.0.0. Use $this->assertSession()->responseContains() instead. See https://www.drupal.org/node/3129738
+   */
+  public function testAssertRaw() {
+    $this->page->getText()->willReturn('foo bar bar');
+    $this->assertRaw('foo', '\'foo\' should be present.');
+  }
+
+  /**
+   * @covers ::assertNoRaw
+   * @expectedDeprecation Calling AssertLegacyTrait::assertNoRaw() with more that one argument is deprecated in drupal:8.2.0 and the method is removed from drupal:10.0.0. Use $this->assertSession()->responseContains() instead. See https://www.drupal.org/node/3129738
+   */
+  public function testAssertNoRaw() {
+    $this->page->getText()->willReturn('foo bar bar');
+    $this->assertNoRaw('qux', '\'qux\' should not be present.');
+  }
+
   /**
    * @covers ::assertUniqueText
    * @expectedDeprecation AssertLegacyTrait::assertUniqueText() is deprecated in drupal:8.2.0 and is removed from drupal:10.0.0. Use $this->getSession()->pageTextContainsOnce() or $this->getSession()->pageTextMatchesCount() instead. See https://www.drupal.org/node/3129738