Issue #3376281 by Indrapatil, nlisgo, longwave, smustgrave: Random machine names no longer need to be wrapped in strtolower()

core/modules/block/tests/src/Functional/BlockHookOperationTest.php

@@ -44,7 +44,7 @@ class BlockHookOperationTest extends BrowserTestBase {
   public function testBlockOperationAlter() {
     // Add a test block, any block will do.
     // Set the machine name so the test_operation link can be built later.
-    $block_id = mb_strtolower($this->randomMachineName(16));
+    $block_id = $this->randomMachineName(16);
     $this->drupalPlaceBlock('system_powered_by_block', ['id' => $block_id]);
 
     // Get the Block listing.

core/modules/block/tests/src/Functional/BlockLanguageTest.php

@@ -79,7 +79,7 @@ class BlockLanguageTest extends BrowserTestBase {
     // Enable a standard block and set the visibility setting for one language.
     $edit = [
       'visibility[language][langcodes][en]' => TRUE,
-      'id' => strtolower($this->randomMachineName(8)),
+      'id' => $this->randomMachineName(8),
       'region' => 'sidebar_first',
     ];
     $this->drupalGet('admin/structure/block/add/system_powered_by_block' . '/' . $default_theme);
@@ -165,7 +165,7 @@ class BlockLanguageTest extends BrowserTestBase {
     $this->assertSession()->fieldExists('visibility[language][context_mapping][language]');
 
     // Enable a standard block and set visibility to French only.
-    $block_id = strtolower($this->randomMachineName(8));
+    $block_id = $this->randomMachineName(8);
     $edit = [
       'visibility[language][context_mapping][language]' => '@language.current_language_context:language_interface',
       'visibility[language][langcodes][fr]' => TRUE,

core/modules/block/tests/src/Functional/BlockTest.php

@@ -30,7 +30,7 @@ class BlockTest extends BlockTestBase {
     // Enable a standard block.
     $default_theme = $this->config('system.theme')->get('default');
     $edit = [
-      'id' => strtolower($this->randomMachineName(8)),
+      'id' => $this->randomMachineName(8),
       'region' => 'sidebar_first',
       'settings[label]' => $title,
       'settings[label_display]' => TRUE,
@@ -90,7 +90,7 @@ class BlockTest extends BlockTestBase {
     // Enable a standard block.
     $default_theme = $this->config('system.theme')->get('default');
     $edit = [
-      'id' => strtolower($this->randomMachineName(8)),
+      'id' => $this->randomMachineName(8),
       'region' => 'sidebar_first',
       'settings[label]' => $title,
     ];
@@ -127,7 +127,7 @@ class BlockTest extends BlockTestBase {
     // Enable a standard block.
     $default_theme = $this->config('system.theme')->get('default');
     $edit = [
-      'id' => strtolower($this->randomMachineName(8)),
+      'id' => $this->randomMachineName(8),
       'region' => 'sidebar_first',
       'settings[label]' => $title,
       'visibility[request_path][negate]' => TRUE,
@@ -187,7 +187,7 @@ class BlockTest extends BlockTestBase {
 
       // Create a random title for the block.
       $title = $this->randomMachineName(8);
-      $block_id = strtolower($this->randomMachineName(8));
+      $block_id = $this->randomMachineName(8);
       $edit = [
         'id' => $block_id,
         'settings[label]' => $title,
@@ -304,7 +304,7 @@ class BlockTest extends BlockTestBase {
       $this->assertSession()->titleEquals('Block layout | Drupal');
       // Select the 'Powered by Drupal' block to be placed.
       $block = [];
-      $block['id'] = strtolower($this->randomMachineName());
+      $block['id'] = $this->randomMachineName();
       $block['theme'] = $theme;
       $block['region'] = 'content';
       $this->drupalGet('admin/structure/block/add/system_powered_by_block');
@@ -343,7 +343,7 @@ class BlockTest extends BlockTestBase {
     $block_name = 'system_powered_by_block';
     // Create a random title for the block.
     $title = $this->randomMachineName(8);
-    $id = strtolower($this->randomMachineName(8));
+    $id = $this->randomMachineName(8);
     // Enable a standard block.
     $default_theme = $this->config('system.theme')->get('default');
     $edit = [

core/modules/block/tests/src/Functional/BlockUiTest.php

@@ -317,7 +317,7 @@ class BlockUiTest extends BrowserTestBase {
 
     // Select the 'Powered by Drupal' block to be placed.
     $block = [];
-    $block['id'] = strtolower($this->randomMachineName());
+    $block['id'] = $this->randomMachineName();
     $block['theme'] = 'stark';
     $block['region'] = 'content';
 

core/modules/block/tests/src/Functional/Views/DisplayBlockTest.php

@@ -70,7 +70,7 @@ class DisplayBlockTest extends ViewTestBase {
     // Create a new view in the UI.
     $edit = [];
     $edit['label'] = $this->randomString();
-    $edit['id'] = strtolower($this->randomMachineName());
+    $edit['id'] = $this->randomMachineName();
     $edit['show[wizard_key]'] = 'standard:views_test_data';
     $edit['description'] = $this->randomString();
     $edit['block[create]'] = TRUE;

core/modules/block/tests/src/Kernel/BlockConfigSchemaTest.php

@@ -65,7 +65,7 @@ class BlockConfigSchemaTest extends KernelTestBase {
    */
   public function testBlockConfigSchema() {
     foreach ($this->blockManager->getDefinitions() as $block_id => $definition) {
-      $id = strtolower($this->randomMachineName());
+      $id = $this->randomMachineName();
       $block = Block::create([
         'id' => $id,
         'theme' => 'stark',

core/modules/block/tests/src/Kernel/NewDefaultThemeBlocksTest.php

@@ -35,15 +35,15 @@ class NewDefaultThemeBlocksTest extends KernelTestBase {
 
     // Add two instances of the user login block.
     $this->placeBlock('user_login_block', [
-      'id' => $default_theme . '_' . strtolower($this->randomMachineName(8)),
+      'id' => $default_theme . '_' . $this->randomMachineName(8),
     ]);
     $this->placeBlock('user_login_block', [
-      'id' => $default_theme . '_' . strtolower($this->randomMachineName(8)),
+      'id' => $default_theme . '_' . $this->randomMachineName(8),
     ]);
 
     // Add an instance of a different block.
     $this->placeBlock('system_powered_by_block', [
-      'id' => $default_theme . '_' . strtolower($this->randomMachineName(8)),
+      'id' => $default_theme . '_' . $this->randomMachineName(8),
     ]);
 
     // Install a different theme that does not have blocks.

core/modules/block/tests/src/Traits/BlockCreationTrait.php

@@ -43,7 +43,7 @@ trait BlockCreationTrait {
     $settings += [
       'plugin' => $plugin_id,
       'region' => 'content',
-      'id' => strtolower($this->randomMachineName(8)),
+      'id' => $this->randomMachineName(8),
       'theme' => $config->get('system.theme')->get('default'),
       'label' => $this->randomMachineName(8),
       'visibility' => [],

core/modules/block_content/tests/src/Functional/BlockContentTestBase.php

@@ -108,7 +108,7 @@ abstract class BlockContentTestBase extends BrowserTestBase {
     if (is_array($values)) {
       if (!isset($values['id'])) {
         do {
-          $id = strtolower($this->randomMachineName(8));
+          $id = $this->randomMachineName(8);
         } while (BlockContentType::load($id));
       }
       else {

core/modules/block_content/tests/src/Functional/BlockContentTranslationUITest.php

@@ -88,7 +88,7 @@ class BlockContentTranslationUITest extends ContentTranslationUITestBase {
    * {@inheritdoc}
    */
   protected function getNewEntityValues($langcode) {
-    return ['info' => mb_strtolower($this->randomMachineName())] + parent::getNewEntityValues($langcode);
+    return ['info' => $this->randomMachineName()] + parent::getNewEntityValues($langcode);
   }
 
   /**

core/modules/block_content/tests/src/Functional/PageEditTest.php

@@ -39,7 +39,7 @@ class PageEditTest extends BlockContentTestBase {
     $body_key = 'body[0][value]';
     // Create block to edit.
     $edit = [];
-    $edit['info[0][value]'] = mb_strtolower($this->randomMachineName(8));
+    $edit['info[0][value]'] = $this->randomMachineName(8);
     $edit[$body_key] = $this->randomMachineName(16);
     $this->drupalGet('block/add/basic');
     $this->submitForm($edit, 'Save');

core/modules/block_content/tests/src/Functional/Views/BlockContentTestBase.php

@@ -88,7 +88,7 @@ abstract class BlockContentTestBase extends ViewTestBase {
     // Find a non-existent random type name.
     if (!isset($values['id'])) {
       do {
-        $id = strtolower($this->randomMachineName(8));
+        $id = $this->randomMachineName(8);
       } while (BlockContentType::load($id));
     }
     else {

core/modules/block_content/tests/src/Functional/Views/BlockContentWizardTest.php

@@ -35,7 +35,7 @@ class BlockContentWizardTest extends BlockContentTestBase {
   public function testViewAddBlockContent() {
     $view = [];
     $view['label'] = $this->randomMachineName(16);
-    $view['id'] = strtolower($this->randomMachineName(16));
+    $view['id'] = $this->randomMachineName(16);
     $view['description'] = $this->randomMachineName(16);
     $view['page[create]'] = FALSE;
     $view['show[wizard_key]'] = 'block_content';

core/modules/comment/tests/src/Functional/CommentInterfaceTest.php

@@ -309,7 +309,7 @@ class CommentInterfaceTest extends CommentTestBase {
     $this->assertSession()->responseContains('<p>' . $comment_text . '</p>');
 
     // Create a new comment entity view mode.
-    $mode = mb_strtolower($this->randomMachineName());
+    $mode = $this->randomMachineName();
     EntityViewMode::create([
       'targetEntityType' => 'comment',
       'id' => "comment.$mode",

core/modules/comment/tests/src/Functional/Views/WizardTest.php

@@ -44,7 +44,7 @@ class WizardTest extends WizardTestBase {
   public function testCommentWizard() {
     $view = [];
     $view['label'] = $this->randomMachineName(16);
-    $view['id'] = strtolower($this->randomMachineName(16));
+    $view['id'] = $this->randomMachineName(16);
     $view['show[wizard_key]'] = 'comment';
     $view['page[create]'] = TRUE;
     $view['page[path]'] = $this->randomMachineName(16);
@@ -73,7 +73,7 @@ class WizardTest extends WizardTestBase {
     }
     $this->assertEquals($expected_options, $actual_options);
 
-    $view['id'] = strtolower($this->randomMachineName(16));
+    $view['id'] = $this->randomMachineName(16);
     $this->submitForm($view, 'Save and edit');
     // Verify that the view saving was successful and the browser got redirected
     // to the edit page.

core/modules/comment/tests/src/Kernel/CommentIntegrationTest.php

@@ -58,7 +58,7 @@ class CommentIntegrationTest extends KernelTestBase {
    * @see CommentDefaultFormatter::calculateDependencies()
    */
   public function testViewMode() {
-    $mode = mb_strtolower($this->randomMachineName());
+    $mode = $this->randomMachineName();
     // Create a new comment view mode and a view display entity.
     EntityViewMode::create([
       'id' => "comment.$mode",
@@ -75,7 +75,7 @@ class CommentIntegrationTest extends KernelTestBase {
     FieldStorageConfig::create([
       'entity_type' => 'entity_test',
       'type' => 'comment',
-      'field_name' => $field_name = mb_strtolower($this->randomMachineName()),
+      'field_name' => $field_name = $this->randomMachineName(),
       'settings' => [
         'comment_type' => 'comment',
       ],

core/modules/config/tests/src/Functional/ConfigEntityStatusUITest.php

@@ -31,7 +31,7 @@ class ConfigEntityStatusUITest extends BrowserTestBase {
       'administer site configuration',
     ]));
 
-    $id = strtolower($this->randomMachineName());
+    $id = $this->randomMachineName();
     $edit = [
       'id' => $id,
       'label' => $this->randomMachineName(),

core/modules/config/tests/src/Functional/ConfigEntityTest.php

@@ -230,7 +230,7 @@ class ConfigEntityTest extends BrowserTestBase {
       'administer site configuration',
     ]));
 
-    $id = strtolower($this->randomMachineName());
+    $id = $this->randomMachineName();
     $label1 = $this->randomMachineName();
     $label2 = $this->randomMachineName();
     $label3 = $this->randomMachineName();
@@ -290,7 +290,7 @@ class ConfigEntityTest extends BrowserTestBase {
 
     // Rename the configuration entity's ID/machine name.
     $edit = [
-      'id' => strtolower($this->randomMachineName()),
+      'id' => $this->randomMachineName(),
       'label' => $label3,
     ];
     $this->drupalGet("admin/structure/config_test/manage/{$id}");
@@ -326,7 +326,7 @@ class ConfigEntityTest extends BrowserTestBase {
     // @see \Drupal\Tests\config\FunctionalJavascript\ConfigEntityTest::testAjaxOnAddPage()
     $this->drupalGet('admin/structure/config_test/add');
 
-    $id = strtolower($this->randomMachineName());
+    $id = $this->randomMachineName();
     $edit = [
       'id' => $id,
       'label' => $this->randomString(),

core/modules/config/tests/src/Functional/ConfigExportImportUITest.php

@@ -106,7 +106,7 @@ class ConfigExportImportUITest extends BrowserTestBase {
     $this->contentType = $this->drupalCreateContentType();
 
     // Create a field.
-    $this->fieldName = mb_strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
     $this->fieldStorage = FieldStorageConfig::create([
       'field_name' => $this->fieldName,
       'entity_type' => 'node',

core/modules/config_translation/tests/src/Functional/ConfigTranslationCacheTest.php

@@ -122,7 +122,7 @@ class ConfigTranslationCacheTest extends BrowserTestBase {
   public function testFieldConfigTranslation() {
     // Add a test field which has a translatable field setting and a
     // translatable field storage setting.
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
@@ -133,7 +133,7 @@ class ConfigTranslationCacheTest extends BrowserTestBase {
     $field_storage->setSetting('translatable_storage_setting', $translatable_storage_setting);
     $field_storage->save();
 
-    $bundle = strtolower($this->randomMachineName());
+    $bundle = $this->randomMachineName();
     entity_test_create_bundle($bundle);
     $field = FieldConfig::create([
       'field_name' => $field_name,

core/modules/config_translation/tests/src/Functional/ConfigTranslationListUiTest.php

@@ -104,7 +104,7 @@ class ConfigTranslationListUiTest extends BrowserTestBase {
   protected function doBlockListTest() {
     // Add a test block, any block will do.
     // Set the machine name so the translate link can be built later.
-    $id = mb_strtolower($this->randomMachineName(16));
+    $id = $this->randomMachineName(16);
     $this->drupalPlaceBlock('system_powered_by_block', ['id' => $id]);
 
     // Get the Block listing.
@@ -127,7 +127,7 @@ class ConfigTranslationListUiTest extends BrowserTestBase {
     // this does not test more than necessary.
     $this->drupalGet('admin/structure/menu/add');
     // Lowercase the machine name.
-    $menu_name = mb_strtolower($this->randomMachineName(16));
+    $menu_name = $this->randomMachineName(16);
     $label = $this->randomMachineName(16);
     $edit = [
       'id' => $menu_name,
@@ -176,7 +176,7 @@ class ConfigTranslationListUiTest extends BrowserTestBase {
     $vocabulary = Vocabulary::create([
       'name' => $this->randomMachineName(),
       'description' => $this->randomMachineName(),
-      'vid' => mb_strtolower($this->randomMachineName()),
+      'vid' => $this->randomMachineName(),
     ]);
     $vocabulary->save();
 
@@ -199,7 +199,7 @@ class ConfigTranslationListUiTest extends BrowserTestBase {
     // Create a test block type to decouple looking for translate
     // operations link so this does not test more than necessary.
     $block_content_type = BlockContentType::create([
-      'id' => mb_strtolower($this->randomMachineName(16)),
+      'id' => $this->randomMachineName(16),
       'label' => $this->randomMachineName(),
       'revision' => FALSE,
     ]);
@@ -224,7 +224,7 @@ class ConfigTranslationListUiTest extends BrowserTestBase {
     // Create a test contact form to decouple looking for translate operations
     // link so this does not test more than necessary.
     $contact_form = ContactForm::create([
-      'id' => mb_strtolower($this->randomMachineName(16)),
+      'id' => $this->randomMachineName(16),
       'label' => $this->randomMachineName(),
     ]);
     $contact_form->save();
@@ -248,7 +248,7 @@ class ConfigTranslationListUiTest extends BrowserTestBase {
     // Create a test content type to decouple looking for translate operations
     // link so this does not test more than necessary.
     $content_type = $this->drupalCreateContentType([
-      'type' => mb_strtolower($this->randomMachineName(16)),
+      'type' => $this->randomMachineName(16),
       'name' => $this->randomMachineName(),
     ]);
 
@@ -271,7 +271,7 @@ class ConfigTranslationListUiTest extends BrowserTestBase {
     // Create a test format to decouple looking for translate operations
     // link so this does not test more than necessary.
     $filter_format = FilterFormat::create([
-      'format' => mb_strtolower($this->randomMachineName(16)),
+      'format' => $this->randomMachineName(16),
       'name' => $this->randomMachineName(),
     ]);
     $filter_format->save();
@@ -295,7 +295,7 @@ class ConfigTranslationListUiTest extends BrowserTestBase {
     // Create a test shortcut to decouple looking for translate operations
     // link so this does not test more than necessary.
     $shortcut = ShortcutSet::create([
-      'id' => mb_strtolower($this->randomMachineName(16)),
+      'id' => $this->randomMachineName(16),
       'label' => $this->randomString(),
     ]);
     $shortcut->save();
@@ -318,7 +318,7 @@ class ConfigTranslationListUiTest extends BrowserTestBase {
   public function doUserRoleListTest() {
     // Create a test role to decouple looking for translate operations
     // link so this does not test more than necessary.
-    $role_id = mb_strtolower($this->randomMachineName(16));
+    $role_id = $this->randomMachineName(16);
     $this->drupalCreateRole([], $role_id);
 
     // Get the role listing.
@@ -400,7 +400,7 @@ class ConfigTranslationListUiTest extends BrowserTestBase {
   public function doFieldListTest() {
     // Create a base content type.
     $content_type = $this->drupalCreateContentType([
-      'type' => mb_strtolower($this->randomMachineName(16)),
+      'type' => $this->randomMachineName(16),
       'name' => $this->randomMachineName(),
     ]);
 

core/modules/config_translation/tests/src/Functional/ConfigTranslationUiTest.php

@@ -746,7 +746,7 @@ class ConfigTranslationUiTest extends BrowserTestBase {
   public function testFieldConfigTranslation() {
     // Add a test field which has a translatable field setting and a
     // translatable field storage setting.
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
@@ -757,7 +757,7 @@ class ConfigTranslationUiTest extends BrowserTestBase {
     $field_storage->setSetting('translatable_storage_setting', $translatable_storage_setting);
     $field_storage->save();
 
-    $bundle = strtolower($this->randomMachineName());
+    $bundle = $this->randomMachineName();
     entity_test_create_bundle($bundle);
     $field = FieldConfig::create([
       'field_name' => $field_name,
@@ -785,14 +785,14 @@ class ConfigTranslationUiTest extends BrowserTestBase {
    */
   public function testBooleanFieldConfigTranslation() {
     // Add a test boolean field.
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
       'type' => 'boolean',
     ])->save();
 
-    $bundle = strtolower($this->randomMachineName());
+    $bundle = $this->randomMachineName();
     entity_test_create_bundle($bundle);
     $field = FieldConfig::create([
       'field_name' => $field_name,

core/modules/contact/tests/src/Functional/ContactSitewideTest.php

@@ -163,16 +163,16 @@ class ContactSitewideTest extends BrowserTestBase {
     $recipients = ['simpletest&@example.com', 'simpletest2@example.com', 'simpletest3@example.com'];
     $max_length = EntityTypeInterface::BUNDLE_MAX_LENGTH;
     $max_length_exceeded = $max_length + 1;
-    $this->addContactForm($id = mb_strtolower($this->randomMachineName($max_length_exceeded)), $label = $this->randomMachineName($max_length_exceeded), implode(',', [$recipients[0]]), '', TRUE);
+    $this->addContactForm($id = $this->randomMachineName($max_length_exceeded), $label = $this->randomMachineName($max_length_exceeded), implode(',', [$recipients[0]]), '', TRUE);
     $this->assertSession()->pageTextContains('Machine-readable name cannot be longer than ' . $max_length . ' characters but is currently ' . $max_length_exceeded . ' characters long.');
-    $this->addContactForm($id = mb_strtolower($this->randomMachineName($max_length)), $label = $this->randomMachineName($max_length), implode(',', [$recipients[0]]), '', TRUE);
+    $this->addContactForm($id = $this->randomMachineName($max_length), $label = $this->randomMachineName($max_length), implode(',', [$recipients[0]]), '', TRUE);
     $this->assertSession()->pageTextContains('Contact form ' . $label . ' has been added.');
 
     // Verify that the creation message contains a link to a contact form.
     $this->assertSession()->elementExists('xpath', '//div[@data-drupal-messages]//a[contains(@href, "contact/")]');
 
     // Create first valid form.
-    $this->addContactForm($id = mb_strtolower($this->randomMachineName(16)), $label = $this->randomMachineName(16), implode(',', [$recipients[0]]), '', TRUE);
+    $this->addContactForm($id = $this->randomMachineName(16), $label = $this->randomMachineName(16), implode(',', [$recipients[0]]), '', TRUE);
     $this->assertSession()->pageTextContains('Contact form ' . $label . ' has been added.');
 
     // Verify that the creation message contains a link to a contact form.
@@ -214,10 +214,10 @@ class ContactSitewideTest extends BrowserTestBase {
     $this->drupalLogin($admin_user);
 
     // Add more forms.
-    $this->addContactForm(mb_strtolower($this->randomMachineName(16)), $label = $this->randomMachineName(16), implode(',', [$recipients[0], $recipients[1]]), '', FALSE);
+    $this->addContactForm($this->randomMachineName(16), $label = $this->randomMachineName(16), implode(',', [$recipients[0], $recipients[1]]), '', FALSE);
     $this->assertSession()->pageTextContains('Contact form ' . $label . ' has been added.');
 
-    $this->addContactForm($name = mb_strtolower($this->randomMachineName(16)), $label = $this->randomMachineName(16), implode(',', [$recipients[0], $recipients[1], $recipients[2]]), '', FALSE);
+    $this->addContactForm($name = $this->randomMachineName(16), $label = $this->randomMachineName(16), implode(',', [$recipients[0], $recipients[1], $recipients[2]]), '', FALSE);
     $this->assertSession()->pageTextContains('Contact form ' . $label . ' has been added.');
 
     // Try adding a form that already exists.
@@ -282,7 +282,7 @@ class ContactSitewideTest extends BrowserTestBase {
 
     $label = $this->randomMachineName(16);
     $recipients = implode(',', [$recipients[0], $recipients[1], $recipients[2]]);
-    $contact_form = mb_strtolower($this->randomMachineName(16));
+    $contact_form = $this->randomMachineName(16);
     $this->addContactForm($contact_form, $label, $recipients, '', FALSE);
     $this->drupalGet('admin/structure/contact');
     $this->clickLink('Edit');
@@ -314,7 +314,7 @@ class ContactSitewideTest extends BrowserTestBase {
     $this->assertSession()->statusCodeEquals(200);
 
     // Create a simple textfield.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_label = $this->randomMachineName();
     $this->fieldUIAddNewField(NULL, $field_name, $field_label, 'text');
     $field_name = 'field_' . $field_name;

core/modules/contact/tests/src/Functional/ContactStorageTest.php

@@ -51,7 +51,7 @@ class ContactStorageTest extends ContactSitewideTest {
     $this->drupalLogin($admin_user);
     // Create first valid contact form.
     $mail = 'simpletest@example.com';
-    $this->addContactForm($id = mb_strtolower($this->randomMachineName(16)), $label = $this->randomMachineName(16), implode(',', [$mail]), '', TRUE, 'Your message has been sent.', [
+    $this->addContactForm($id = $this->randomMachineName(16), $label = $this->randomMachineName(16), implode(',', [$mail]), '', TRUE, 'Your message has been sent.', [
       'send_a_pony' => 1,
     ]);
     $this->assertSession()->pageTextContains('Contact form ' . $label . ' has been added.');

core/modules/contact/tests/src/Kernel/Views/ContactFieldsTest.php

@@ -34,7 +34,7 @@ class ContactFieldsTest extends KernelTestBase {
     FieldStorageConfig::create([
       'type' => 'text',
       'entity_type' => 'contact_message',
-      'field_name' => $field_name = strtolower($this->randomMachineName()),
+      'field_name' => $field_name = $this->randomMachineName(),
     ])->save();
 
     ContactForm::create([

core/modules/datetime/tests/src/Functional/DateTestBase.php

@@ -114,8 +114,8 @@ abstract class DateTestBase extends BrowserTestBase {
    * Creates a date test field.
    */
   protected function createField() {
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
-    $field_label = Unicode::ucfirst(mb_strtolower($this->randomMachineName()));
+    $field_label = Unicode::ucfirst($this->randomMachineName());
     $type = $this->getTestFieldType();
     $widget_type = $formatter_type = $type . '_default';
 

core/modules/datetime/tests/src/Functional/DateTimeFieldTest.php

@@ -688,7 +688,7 @@ class DateTimeFieldTest extends DateTestBase {
     $this->drupalCreateContentType(['type' => 'date_content']);
 
     // Create a field storage with settings to validate.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'node',
@@ -905,7 +905,7 @@ class DateTimeFieldTest extends DateTestBase {
     $this->drupalCreateContentType(['type' => 'date_content']);
 
     // Create a field storage with settings to validate.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'node',

core/modules/datetime_range/tests/src/Functional/DateRangeFieldTest.php

@@ -1000,7 +1000,7 @@ class DateRangeFieldTest extends DateTestBase {
     $this->drupalCreateContentType(['type' => 'date_content']);
 
     // Create a field storage with settings to validate.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'node',
@@ -1391,7 +1391,7 @@ class DateRangeFieldTest extends DateTestBase {
     $this->drupalCreateContentType(['type' => 'date_content']);
 
     // Create a field storage with settings to validate.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'node',

core/modules/datetime_range/tests/src/Kernel/DateRangeItemTest.php

@@ -46,7 +46,7 @@ class DateRangeItemTest extends FieldKernelTestBase {
 
     // Add a datetime range field.
     $this->fieldStorage = FieldStorageConfig::create([
-      'field_name' => mb_strtolower($this->randomMachineName()),
+      'field_name' => $this->randomMachineName(),
       'entity_type' => 'entity_test',
       'type' => 'daterange',
       'settings' => ['datetime_type' => DateRangeItem::DATETIME_TYPE_DATE],

core/modules/datetime_range/tests/src/Kernel/SeparatorTranslationTest.php

@@ -57,7 +57,7 @@ class SeparatorTranslationTest extends KernelTestBase {
 
     // Add a datetime range field.
     $this->fieldStorage = FieldStorageConfig::create([
-      'field_name' => mb_strtolower($this->randomMachineName()),
+      'field_name' => $this->randomMachineName(),
       'entity_type' => 'entity_test',
       'type' => 'daterange',
       'settings' => ['datetime_type' => DateTimeItem::DATETIME_TYPE_DATE],

core/modules/editor/tests/src/Functional/EditorAdminTest.php

@@ -116,7 +116,7 @@ class EditorAdminTest extends BrowserTestBase {
     $this->container->get('module_installer')->install(['node']);
     $this->resetAll();
     // Create a new node type and attach the 'body' field to it.
-    $node_type = NodeType::create(['type' => mb_strtolower($this->randomMachineName()), 'name' => $this->randomString()]);
+    $node_type = NodeType::create(['type' => $this->randomMachineName(), 'name' => $this->randomString()]);
     $node_type->save();
     node_add_body_field($node_type, $this->randomString());
 

core/modules/editor/tests/src/Kernel/EditorFilterIntegrationTest.php

@@ -24,7 +24,7 @@ class EditorFilterIntegrationTest extends KernelTestBase {
   public function testTextFormatIntegration() {
     // Create an arbitrary text format.
     $format = FilterFormat::create([
-      'format' => mb_strtolower($this->randomMachineName()),
+      'format' => $this->randomMachineName(),
       'name' => $this->randomString(),
     ]);
     $format->save();

core/modules/field/tests/src/Functional/Boolean/BooleanFieldTest.php

@@ -68,7 +68,7 @@ class BooleanFieldTest extends BrowserTestBase {
     $label = $this->randomMachineName();
 
     // Create a field with settings to validate.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->fieldStorage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',

core/modules/field/tests/src/Functional/Boolean/BooleanFormatterSettingsTest.php

@@ -46,7 +46,7 @@ class BooleanFormatterSettingsTest extends BrowserTestBase {
     parent::setUp();
 
     // Create a content type. Use Node because it has Field UI pages that work.
-    $type_name = mb_strtolower($this->randomMachineName(8)) . '_test';
+    $type_name = $this->randomMachineName(8) . '_test';
     $type = $this->drupalCreateContentType(['name' => $type_name, 'type' => $type_name]);
     $this->bundle = $type->id();
 
@@ -60,7 +60,7 @@ class BooleanFormatterSettingsTest extends BrowserTestBase {
     ]);
     $this->drupalLogin($admin_user);
 
-    $this->fieldName = mb_strtolower($this->randomMachineName(8));
+    $this->fieldName = $this->randomMachineName(8);
 
     $field_storage = FieldStorageConfig::create([
       'field_name' => $this->fieldName,

core/modules/field/tests/src/Functional/Email/EmailFieldTest.php

@@ -58,7 +58,7 @@ class EmailFieldTest extends BrowserTestBase {
    */
   public function testEmailField() {
     // Create a field with settings to validate.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->fieldStorage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',

core/modules/field/tests/src/Functional/EntityReference/EntityReferenceAdminTest.php

@@ -57,7 +57,7 @@ class EntityReferenceAdminTest extends BrowserTestBase {
     $this->drupalPlaceBlock('system_breadcrumb_block');
 
     // Create a content type, with underscores.
-    $type_name = strtolower($this->randomMachineName(8)) . '_test';
+    $type_name = $this->randomMachineName(8) . '_test';
     $type = $this->drupalCreateContentType(['name' => $type_name, 'type' => $type_name]);
     $this->type = $type->id();
 
@@ -303,7 +303,7 @@ class EntityReferenceAdminTest extends BrowserTestBase {
     /** @var \Drupal\taxonomy\Entity\Vocabulary[] $vocabularies */
     $vocabularies = [];
     for ($i = 0; $i < 2; $i++) {
-      $vid = mb_strtolower($this->randomMachineName());
+      $vid = $this->randomMachineName();
       $vocabularies[$i] = Vocabulary::create([
         'name' => $this->randomString(),
         'vid' => $vid,
@@ -374,7 +374,7 @@ class EntityReferenceAdminTest extends BrowserTestBase {
     $bundle_path = 'admin/structure/types/manage/' . $this->type;
 
     // Generate a random field name, must be only lowercase characters.
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
 
     $storage_edit = $field_edit = [];
     $storage_edit['settings[target_type]'] = $target_type;

core/modules/field/tests/src/Functional/EntityReference/EntityReferenceAutoCreateTest.php

@@ -162,7 +162,7 @@ class EntityReferenceAutoCreateTest extends BrowserTestBase {
     /** @var \Drupal\taxonomy\Entity\Vocabulary[] $vocabularies */
     $vocabularies = [];
     for ($i = 0; $i < 2; $i++) {
-      $vid = mb_strtolower($this->randomMachineName());
+      $vid = $this->randomMachineName();
       $vocabularies[$i] = Vocabulary::create([
         'name' => $this->randomMachineName(),
         'vid' => $vid,
@@ -173,7 +173,7 @@ class EntityReferenceAutoCreateTest extends BrowserTestBase {
     // Create a taxonomy term entity reference field that saves the auto-created
     // taxonomy terms in the second vocabulary from the two that were configured
     // as targets.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $handler_settings = [
       'target_bundles' => [
         $vocabularies[0]->id() => $vocabularies[0]->id(),
@@ -261,7 +261,7 @@ class EntityReferenceAutoCreateTest extends BrowserTestBase {
     ]);
     $this->drupalLogin($account);
 
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $handler_settings = [
       'auto_create' => TRUE,
     ];

core/modules/field/tests/src/Functional/EntityReference/EntityReferenceFieldDefaultValueTest.php

@@ -64,7 +64,7 @@ class EntityReferenceFieldDefaultValueTest extends BrowserTestBase {
     // Create a node to be referenced.
     $referenced_node = $this->drupalCreateNode(['type' => 'referenced_content']);
 
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'node',
@@ -129,7 +129,7 @@ class EntityReferenceFieldDefaultValueTest extends BrowserTestBase {
     $referenced_node_type = $this->drupalCreateContentType(['type' => 'referenced_config_to_delete']);
     $referenced_node_type2 = $this->drupalCreateContentType(['type' => 'referenced_config_to_preserve']);
 
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'node',

core/modules/field/tests/src/Functional/FunctionalString/StringFieldTest.php

@@ -63,7 +63,7 @@ class StringFieldTest extends BrowserTestBase {
    */
   public function _testTextfieldWidgets($field_type, $widget_type) {
     // Create a field.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',

core/modules/field/tests/src/Functional/Number/NumberFieldTest.php

@@ -47,7 +47,7 @@ class NumberFieldTest extends BrowserTestBase {
    */
   public function testNumberDecimalField() {
     // Create a field with settings to validate.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
@@ -138,7 +138,7 @@ class NumberFieldTest extends BrowserTestBase {
     $maximum = rand(2000, 4000);
 
     // Create a field with settings to validate.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
@@ -290,7 +290,7 @@ class NumberFieldTest extends BrowserTestBase {
    */
   public function testNumberFloatField() {
     // Create a field with settings to validate.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
@@ -383,7 +383,7 @@ class NumberFieldTest extends BrowserTestBase {
    */
   public function testCreateNumberFloatField() {
     // Create a float field.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',
@@ -408,7 +408,7 @@ class NumberFieldTest extends BrowserTestBase {
    */
   public function testCreateNumberDecimalField() {
     // Create a decimal field.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',

core/modules/field/tests/src/Functional/TranslationWebTest.php

@@ -60,7 +60,7 @@ class TranslationWebTest extends FieldTestBase {
   protected function setUp(): void {
     parent::setUp();
 
-    $this->fieldName = mb_strtolower($this->randomMachineName() . '_field_name');
+    $this->fieldName = $this->randomMachineName() . '_field_name';
 
     $field_storage = [
       'field_name' => $this->fieldName,

core/modules/field/tests/src/FunctionalJavascript/Boolean/BooleanFormatterSettingsTest.php

@@ -46,7 +46,7 @@ class BooleanFormatterSettingsTest extends WebDriverTestBase {
     parent::setUp();
 
     // Create a content type. Use Node because it has Field UI pages that work.
-    $type_name = mb_strtolower($this->randomMachineName(8)) . '_test';
+    $type_name = $this->randomMachineName(8) . '_test';
     $type = $this->drupalCreateContentType(['name' => $type_name, 'type' => $type_name]);
     $this->bundle = $type->id();
 
@@ -60,7 +60,7 @@ class BooleanFormatterSettingsTest extends WebDriverTestBase {
     ]);
     $this->drupalLogin($admin_user);
 
-    $this->fieldName = mb_strtolower($this->randomMachineName(8));
+    $this->fieldName = $this->randomMachineName(8);
 
     $field_storage = FieldStorageConfig::create([
       'field_name' => $this->fieldName,

core/modules/field/tests/src/FunctionalJavascript/EntityReference/EntityReferenceAdminTest.php

@@ -65,12 +65,12 @@ class EntityReferenceAdminTest extends WebDriverTestBase {
     $this->drupalPlaceBlock('system_breadcrumb_block');
 
     // Create a content type, with underscores.
-    $type_name = strtolower($this->randomMachineName(8)) . '_test';
+    $type_name = $this->randomMachineName(8) . '_test';
     $type = $this->drupalCreateContentType(['name' => $type_name, 'type' => $type_name]);
     $this->type = $type->id();
 
     // Create a second content type, to be a target for entity reference fields.
-    $type_name = strtolower($this->randomMachineName(8)) . '_test';
+    $type_name = $this->randomMachineName(8) . '_test';
     $type = $this->drupalCreateContentType(['name' => $type_name, 'type' => $type_name]);
     $this->targetType = $type->id();
 

core/modules/field/tests/src/FunctionalJavascript/Number/NumberFieldTest.php

@@ -45,9 +45,9 @@ class NumberFieldTest extends WebDriverTestBase {
    * Tests default formatter behavior.
    */
   public function testNumberFormatter() {
-    $type = mb_strtolower($this->randomMachineName());
+    $type = $this->randomMachineName();
-    $float_field = mb_strtolower($this->randomMachineName());
+    $float_field = $this->randomMachineName();
-    $integer_field = mb_strtolower($this->randomMachineName());
+    $integer_field = $this->randomMachineName();
     $thousand_separators = ['', '.', ',', ' ', chr(8201), "'"];
     $decimal_separators = ['.', ','];
     $prefix = $this->randomMachineName();

core/modules/field/tests/src/Kernel/Boolean/BooleanFormatterTest.php

@@ -60,7 +60,7 @@ class BooleanFormatterTest extends KernelTestBase {
 
     $this->entityType = 'entity_test';
     $this->bundle = $this->entityType;
-    $this->fieldName = mb_strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
 
     $field_storage = FieldStorageConfig::create([
       'field_name' => $this->fieldName,

core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceItemTest.php

@@ -88,7 +88,7 @@ class EntityReferenceItemTest extends FieldKernelTestBase {
 
     $this->vocabulary = Vocabulary::create([
       'name' => $this->randomMachineName(),
-      'vid' => mb_strtolower($this->randomMachineName()),
+      'vid' => $this->randomMachineName(),
       'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
     ]);
     $this->vocabulary->save();
@@ -291,7 +291,7 @@ class EntityReferenceItemTest extends FieldKernelTestBase {
     // Make sure the computed term reflects updates to the term id.
     $vocabulary2 = $vocabulary = Vocabulary::create([
       'name' => $this->randomMachineName(),
-      'vid' => mb_strtolower($this->randomMachineName()),
+      'vid' => $this->randomMachineName(),
       'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
     ]);
     $vocabulary2->save();
@@ -362,7 +362,7 @@ class EntityReferenceItemTest extends FieldKernelTestBase {
    * Tests that the 'handler' field setting stores the proper plugin ID.
    */
   public function testSelectionHandlerSettings() {
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',

core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceSettingsTest.php

@@ -72,13 +72,13 @@ class EntityReferenceSettingsTest extends KernelTestBase {
     $this->installEntitySchema('entity_test');
 
     $this->nodeType = NodeType::create([
-      'type' => mb_strtolower($this->randomMachineName()),
+      'type' => $this->randomMachineName(),
       'name' => $this->randomString(),
     ]);
     $this->nodeType->save();
 
     // Create a custom bundle.
-    $this->customBundle = 'test_bundle_' . mb_strtolower($this->randomMachineName());
+    $this->customBundle = 'test_bundle_' . $this->randomMachineName();
     entity_test_create_bundle($this->customBundle, NULL, 'entity_test');
 
     // Prepare the logger for collecting the expected critical error.
@@ -93,7 +93,7 @@ class EntityReferenceSettingsTest extends KernelTestBase {
     /** @var \Drupal\taxonomy\Entity\Vocabulary[] $vocabularies */
     $vocabularies = [];
     for ($i = 0; $i < 2; $i++) {
-      $vid = mb_strtolower($this->randomMachineName());
+      $vid = $this->randomMachineName();
       $vocabularies[$i] = Vocabulary::create([
         'name' => $this->randomString(),
         'vid' => $vid,
@@ -101,7 +101,7 @@ class EntityReferenceSettingsTest extends KernelTestBase {
       $vocabularies[$i]->save();
     }
     // Attach an entity reference field to $this->nodeType.
-    $name = mb_strtolower($this->randomMachineName());
+    $name = $this->randomMachineName();
     $label = $this->randomString();
     $handler_settings = [
       'target_bundles' => [
@@ -150,7 +150,7 @@ class EntityReferenceSettingsTest extends KernelTestBase {
    */
   public function testCustomTargetBundleDeletion() {
     // Attach an entity reference field to $this->nodeType.
-    $name = mb_strtolower($this->randomMachineName());
+    $name = $this->randomMachineName();
     $label = $this->randomString();
     $handler_settings = ['target_bundles' => [$this->customBundle => $this->customBundle]];
     $this->createEntityReferenceField('node', $this->nodeType->id(), $name, $label, 'entity_test', 'default', $handler_settings);

core/modules/field/tests/src/Kernel/EntityReference/Views/SelectionTest.php

@@ -60,7 +60,7 @@ class SelectionTest extends KernelTestBase {
     $this->installEntitySchema('node');
 
     // Create test nodes.
-    $type = strtolower($this->randomMachineName());
+    $type = $this->randomMachineName();
     NodeType::create(['type' => $type])->save();
     $node1 = $this->createNode(['type' => $type]);
     $node2 = $this->createNode(['type' => $type]);

core/modules/field/tests/src/Kernel/FieldAttachStorageTest.php

@@ -294,7 +294,7 @@ class FieldAttachStorageTest extends FieldKernelTestBase {
     $cardinality = $this->fieldTestData->field_storage->getCardinality();
 
     // Create a new bundle.
-    $new_bundle = 'test_bundle_' . mb_strtolower($this->randomMachineName());
+    $new_bundle = 'test_bundle_' . $this->randomMachineName();
     entity_test_create_bundle($new_bundle, NULL, $entity_type);
 
     // Add a field to that bundle.
@@ -321,7 +321,7 @@ class FieldAttachStorageTest extends FieldKernelTestBase {
     $this->createFieldWithStorage('', $entity_type);
 
     // Create a new bundle.
-    $new_bundle = 'test_bundle_' . mb_strtolower($this->randomMachineName());
+    $new_bundle = 'test_bundle_' . $this->randomMachineName();
     entity_test_create_bundle($new_bundle, NULL, $entity_type);
 
     // Add a field to that bundle.
@@ -329,7 +329,7 @@ class FieldAttachStorageTest extends FieldKernelTestBase {
     FieldConfig::create($this->fieldTestData->field_definition)->save();
 
     // Create a second field for the test bundle
-    $field_name = mb_strtolower($this->randomMachineName() . '_field_name');
+    $field_name = $this->randomMachineName() . '_field_name';
     $field_storage = [
       'field_name' => $field_name,
       'entity_type' => $entity_type,

core/modules/field/tests/src/Kernel/FieldCrudTest.php

@@ -45,7 +45,7 @@ class FieldCrudTest extends FieldKernelTestBase {
     parent::setUp();
 
     $this->fieldStorageDefinition = [
-      'field_name' => mb_strtolower($this->randomMachineName()),
+      'field_name' => $this->randomMachineName(),
       'entity_type' => 'entity_test',
       'type' => 'test_field',
     ];
@@ -201,7 +201,7 @@ class FieldCrudTest extends FieldKernelTestBase {
    * Tests creating a field with custom storage set.
    */
   public function testCreateFieldCustomStorage() {
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     \Drupal::state()->set('field_test_custom_storage', $field_name);
 
     $field_storage = FieldStorageConfig::create([

core/modules/field/tests/src/Kernel/FieldDisplayTest.php

@@ -67,7 +67,7 @@ class FieldDisplayTest extends KernelTestBase {
 
     $this->entityType = 'entity_test_rev';
     $this->bundle = $this->entityType;
-    $this->fieldName = mb_strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
 
     $field_storage = FieldStorageConfig::create([
       'field_name' => $this->fieldName,

core/modules/field/tests/src/Kernel/FieldFormatterTest.php

@@ -54,7 +54,7 @@ class FieldFormatterTest extends KernelTestBase {
 
     $entity_type = 'entity_test_rev';
     $bundle = $entity_type;
-    $this->fieldName = mb_strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
 
     $field_storage = FieldStorageConfig::create([
       'field_name' => $this->fieldName,

core/modules/field/tests/src/Kernel/FieldKernelTestBase.php

@@ -98,7 +98,7 @@ abstract class FieldKernelTestBase extends KernelTestBase {
     $field = 'field' . $suffix;
     $field_definition = 'field_definition' . $suffix;
 
-    $this->fieldTestData->$field_name = mb_strtolower($this->randomMachineName() . '_field_name' . $suffix);
+    $this->fieldTestData->$field_name = $this->randomMachineName() . '_field_name' . $suffix;
     $this->fieldTestData->$field_storage = FieldStorageConfig::create([
       'field_name' => $this->fieldTestData->$field_name,
       'entity_type' => $entity_type,

core/modules/field/tests/src/Kernel/KernelString/RawStringFormatterTest.php

@@ -62,7 +62,7 @@ class RawStringFormatterTest extends KernelTestBase {
 
     $this->entityType = 'entity_test';
     $this->bundle = $this->entityType;
-    $this->fieldName = mb_strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
 
     $field_storage = FieldStorageConfig::create([
       'field_name' => $this->fieldName,

core/modules/field/tests/src/Kernel/KernelString/StringFormatterTest.php

@@ -72,7 +72,7 @@ class StringFormatterTest extends KernelTestBase {
 
     $this->entityType = 'entity_test_rev';
     $this->bundle = $this->entityType;
-    $this->fieldName = mb_strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
 
     $field_storage = FieldStorageConfig::create([
       'field_name' => $this->fieldName,

core/modules/field/tests/src/Kernel/Timestamp/TimestampFormatterTest.php

@@ -60,7 +60,7 @@ class TimestampFormatterTest extends KernelTestBase {
 
     $this->entityType = 'entity_test';
     $this->bundle = $this->entityType;
-    $this->fieldName = mb_strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
 
     $field_storage = FieldStorageConfig::create([
       'field_name' => $this->fieldName,

core/modules/field/tests/src/Kernel/TranslationTest.php

@@ -76,7 +76,7 @@ class TranslationTest extends FieldKernelTestBase {
     $this->installEntitySchema('node');
     $this->installConfig(['language']);
 
-    $this->fieldName = mb_strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
 
     $this->entityType = 'entity_test';
 
@@ -141,7 +141,7 @@ class TranslationTest extends FieldKernelTestBase {
     }
 
     // Test default values.
-    $field_name_default = mb_strtolower($this->randomMachineName() . '_field_name');
+    $field_name_default = $this->randomMachineName() . '_field_name';
     $field_storage_definition = $this->fieldStorageDefinition;
     $field_storage_definition['field_name'] = $field_name_default;
     $field_storage = FieldStorageConfig::create($field_storage_definition);

core/modules/field/tests/src/Kernel/Uri/UriItemTest.php

@@ -37,7 +37,7 @@ class UriItemTest extends FieldKernelTestBase {
     $label = $this->randomMachineName();
 
     // Create a field with settings to validate.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->fieldStorage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',

core/modules/field_ui/tests/src/Functional/EntityDisplayModeTest.php

@@ -65,7 +65,7 @@ class EntityDisplayModeTest extends BrowserTestBase {
     // Test adding a view mode including dots in machine_name.
     $this->clickLink('Test entity');
     $edit = [
-      'id' => strtolower($this->randomMachineName()) . '.' . strtolower($this->randomMachineName()),
+      'id' => $this->randomMachineName() . '.' . $this->randomMachineName(),
       'label' => $this->randomString(),
     ];
     $this->submitForm($edit, 'Save');
@@ -73,7 +73,7 @@ class EntityDisplayModeTest extends BrowserTestBase {
 
     // Test adding a view mode.
     $edit = [
-      'id' => strtolower($this->randomMachineName()),
+      'id' => $this->randomMachineName(),
       'label' => $this->randomString(),
     ];
     $this->submitForm($edit, 'Save');
@@ -119,7 +119,7 @@ class EntityDisplayModeTest extends BrowserTestBase {
     // Test adding a view mode including dots in machine_name.
     $this->clickLink('Test entity');
     $edit = [
-      'id' => strtolower($this->randomMachineName()) . '.' . strtolower($this->randomMachineName()),
+      'id' => $this->randomMachineName() . '.' . $this->randomMachineName(),
       'label' => $this->randomString(),
     ];
     $this->submitForm($edit, 'Save');
@@ -127,7 +127,7 @@ class EntityDisplayModeTest extends BrowserTestBase {
 
     // Test adding a form mode.
     $edit = [
-      'id' => strtolower($this->randomMachineName()),
+      'id' => $this->randomMachineName(),
       'label' => $this->randomString(),
     ];
     $this->submitForm($edit, 'Save');

core/modules/field_ui/tests/src/Functional/FieldUIDeleteTest.php

@@ -78,7 +78,7 @@ class FieldUIDeleteTest extends BrowserTestBase {
     $field_name = 'field_test';
 
     // Create an additional node type.
-    $type_name1 = strtolower($this->randomMachineName(8)) . '_test';
+    $type_name1 = $this->randomMachineName(8) . '_test';
     $type1 = $this->drupalCreateContentType(['name' => $type_name1, 'type' => $type_name1]);
     $type_name1 = $type1->id();
 
@@ -87,7 +87,7 @@ class FieldUIDeleteTest extends BrowserTestBase {
     $this->fieldUIAddNewField($bundle_path1, $field_name_input, $field_label);
 
     // Create an additional node type.
-    $type_name2 = strtolower($this->randomMachineName(8)) . '_test';
+    $type_name2 = $this->randomMachineName(8) . '_test';
     $type2 = $this->drupalCreateContentType(['name' => $type_name2, 'type' => $type_name2]);
     $type_name2 = $type2->id();
 

core/modules/field_ui/tests/src/Functional/ManageDisplayTest.php

@@ -79,7 +79,7 @@ class ManageDisplayTest extends BrowserTestBase {
     $this->drupalLogin($admin_user);
 
     // Create content type, with underscores.
-    $type_name = strtolower($this->randomMachineName(8)) . '_test';
+    $type_name = $this->randomMachineName(8) . '_test';
     $type = $this->drupalCreateContentType(['name' => $type_name, 'type' => $type_name]);
     $this->type = $type->id();
 
@@ -87,7 +87,7 @@ class ManageDisplayTest extends BrowserTestBase {
     $vocabulary = Vocabulary::create([
       'name' => $this->randomMachineName(),
       'description' => $this->randomMachineName(),
-      'vid' => mb_strtolower($this->randomMachineName()),
+      'vid' => $this->randomMachineName(),
       'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
       'help' => '',
       'nodes' => ['article' => 'article'],

core/modules/field_ui/tests/src/Functional/ManageFieldsFunctionalTest.php

@@ -104,13 +104,13 @@ class ManageFieldsFunctionalTest extends BrowserTestBase {
     $this->drupalLogin($admin_user);
 
     // Create content type, with underscores.
-    $type_name = strtolower($this->randomMachineName(8)) . '_test';
+    $type_name = $this->randomMachineName(8) . '_test';
     $type = $this->drupalCreateContentType(['name' => $type_name, 'type' => $type_name]);
     $this->contentType = $type->id();
 
     // Create random field name with markup to test escaping.
     $this->fieldLabel = '<em>' . $this->randomMachineName(8) . '</em>';
-    $this->fieldNameInput = strtolower($this->randomMachineName(8));
+    $this->fieldNameInput = $this->randomMachineName(8);
     $this->fieldName = 'field_' . $this->fieldNameInput;
 
     // Create Basic page and Article node types.
@@ -477,7 +477,7 @@ class ManageFieldsFunctionalTest extends BrowserTestBase {
    */
   public function testFieldPrefix() {
     // Change default field prefix.
-    $field_prefix = strtolower($this->randomMachineName(10));
+    $field_prefix = $this->randomMachineName(10);
     $this->config('field_ui.settings')->set('field_prefix', $field_prefix)->save();
 
     // Create a field input and label exceeding the new maxlength, which is 22.
@@ -600,7 +600,7 @@ class ManageFieldsFunctionalTest extends BrowserTestBase {
     $this->fieldUIAddNewField($bundle_path1, $this->fieldNameInput, $this->fieldLabel);
 
     // Create an additional node type.
-    $type_name2 = strtolower($this->randomMachineName(8)) . '_test';
+    $type_name2 = $this->randomMachineName(8) . '_test';
     $type2 = $this->drupalCreateContentType(['name' => $type_name2, 'type' => $type_name2]);
     $type_name2 = $type2->id();
 
@@ -659,7 +659,7 @@ class ManageFieldsFunctionalTest extends BrowserTestBase {
   public function testLockedField() {
     // Create a locked field and attach it to a bundle. We need to do this
     // programmatically as there's no way to create a locked field through UI.
-    $field_name = strtolower($this->randomMachineName(8));
+    $field_name = $this->randomMachineName(8);
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'node',

core/modules/field_ui/tests/src/FunctionalJavascript/ManageDisplayTest.php

@@ -71,7 +71,7 @@ class ManageDisplayTest extends WebDriverTestBase {
     $this->drupalLogin($admin_user);
 
     // Create content type, with underscores.
-    $type_name = strtolower($this->randomMachineName(8)) . '_test';
+    $type_name = $this->randomMachineName(8) . '_test';
     $type = $this->drupalCreateContentType(['name' => $type_name, 'type' => $type_name]);
     $this->type = $type->id();
 

core/modules/field_ui/tests/src/Kernel/EntityDisplayTest.php

@@ -533,14 +533,14 @@ class EntityDisplayTest extends KernelTestBase {
     // Create two arbitrary user roles.
     for ($i = 0; $i < 2; $i++) {
       $roles[$i] = Role::create([
-        'id' => mb_strtolower($this->randomMachineName()),
+        'id' => $this->randomMachineName(),
         'label' => $this->randomString(),
       ]);
       $roles[$i]->save();
     }
 
     // Create a field of type 'test_field' attached to 'entity_test'.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',

core/modules/file/tests/src/Functional/FileFieldDisplayTest.php

@@ -25,7 +25,7 @@ class FileFieldDisplayTest extends FileFieldTestBase {
    * Tests normal formatter display on node display.
    */
   public function testNodeDisplay() {
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $type_name = 'article';
     $field_storage_settings = [
       'display_field' => '1',
@@ -131,7 +131,7 @@ class FileFieldDisplayTest extends FileFieldTestBase {
    * Tests default display of File Field.
    */
   public function testDefaultFileFieldDisplay() {
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $type_name = 'article';
     $field_storage_settings = [
       'display_field' => '1',
@@ -160,7 +160,7 @@ class FileFieldDisplayTest extends FileFieldTestBase {
   public function testDescToggle() {
     $type_name = 'test';
     $field_type = 'file';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     // Use the UI to add a new content type that also contains a file field.
     $edit = [
       'name' => $type_name,
@@ -190,7 +190,7 @@ class FileFieldDisplayTest extends FileFieldTestBase {
    * Tests description display of File Field.
    */
   public function testDescriptionDefaultFileFieldDisplay() {
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $type_name = 'article';
     $field_storage_settings = [
       'display_field' => '1',

core/modules/file/tests/src/Functional/FileFieldFormatterAccessTest.php

@@ -25,7 +25,7 @@ class FileFieldFormatterAccessTest extends FileFieldTestBase {
    */
   public function testFileAccessHandler() {
     $type_name = 'article';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createFileField($field_name, 'node', $type_name);
     \Drupal::state()->set('file_test_alternate_access_handler', TRUE);
     \Drupal::entityTypeManager()->clearCachedDefinitions();

core/modules/file/tests/src/Functional/FileFieldPathTest.php

@@ -23,7 +23,7 @@ class FileFieldPathTest extends FileFieldTestBase {
   public function testUploadPath() {
     /** @var \Drupal\node\NodeStorageInterface $node_storage */
     $node_storage = $this->container->get('entity_type.manager')->getStorage('node');
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $type_name = 'article';
     $this->createFileField($field_name, 'node', $type_name);
     /** @var \Drupal\file\FileInterface $test_file */

core/modules/file/tests/src/Functional/FileFieldRSSContentTest.php

@@ -28,7 +28,7 @@ class FileFieldRSSContentTest extends FileFieldTestBase {
    */
   public function testFileFieldRSSContent() {
     $node_storage = $this->container->get('entity_type.manager')->getStorage('node');
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $type_name = 'article';
 
     $this->createFileField($field_name, 'node', $type_name);

core/modules/file/tests/src/Functional/FileFieldRevisionTest.php

@@ -36,7 +36,7 @@ class FileFieldRevisionTest extends FileFieldTestBase {
       ->save();
     $node_storage = $this->container->get('entity_type.manager')->getStorage('node');
     $type_name = 'article';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createFileField($field_name, 'node', $type_name);
     // Create the same fields for users.
     $this->createFileField($field_name, 'user', 'user');

core/modules/file/tests/src/Functional/FileFieldValidateTest.php

@@ -28,7 +28,7 @@ class FileFieldValidateTest extends FileFieldTestBase {
   public function testRequired() {
     $node_storage = $this->container->get('entity_type.manager')->getStorage('node');
     $type_name = 'article';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $storage = $this->createFileField($field_name, 'node', $type_name, [], ['required' => '1']);
     $field = FieldConfig::loadByName('node', $type_name, $field_name);
 
@@ -78,7 +78,7 @@ class FileFieldValidateTest extends FileFieldTestBase {
   public function testFileMaxSize() {
     $node_storage = $this->container->get('entity_type.manager')->getStorage('node');
     $type_name = 'article';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createFileField($field_name, 'node', $type_name, [], ['required' => '1']);
 
     // 128KB.
@@ -130,7 +130,7 @@ class FileFieldValidateTest extends FileFieldTestBase {
   public function testFileExtension() {
     $node_storage = $this->container->get('entity_type.manager')->getStorage('node');
     $type_name = 'article';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createFileField($field_name, 'node', $type_name);
 
     $test_file = $this->getTestFile('image');

core/modules/file/tests/src/Functional/FileFieldWidgetTest.php

@@ -81,7 +81,7 @@ class FileFieldWidgetTest extends FileFieldTestBase {
   public function testSingleValuedWidget() {
     $node_storage = $this->container->get('entity_type.manager')->getStorage('node');
     $type_name = 'article';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createFileField($field_name, 'node', $type_name);
 
     $test_file = $this->getTestFile('text');
@@ -250,7 +250,7 @@ class FileFieldWidgetTest extends FileFieldTestBase {
     user_role_grant_permissions($this->adminUser->roles[0]->target_id, ['administer node fields']);
 
     $type_name = 'article';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createFileField($field_name, 'node', $type_name);
     $field = FieldConfig::loadByName('node', $type_name, $field_name);
     $field_id = $field->id();
@@ -299,7 +299,7 @@ class FileFieldWidgetTest extends FileFieldTestBase {
     // Create a new field.
     $this->addDefaultCommentField('node', 'article');
 
-    $name = strtolower($this->randomMachineName());
+    $name = $this->randomMachineName();
     $label = $this->randomMachineName();
     $storage_edit = ['settings[uri_scheme]' => 'private'];
     $this->fieldUIAddNewField('admin/structure/comment/manage/comment', $name, $label, 'file', $storage_edit);
@@ -362,7 +362,7 @@ class FileFieldWidgetTest extends FileFieldTestBase {
    */
   public function testWidgetValidation() {
     $type_name = 'article';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createFileField($field_name, 'node', $type_name);
     $this->updateFileField($field_name, $type_name, ['file_extensions' => 'txt']);
 
@@ -391,7 +391,7 @@ class FileFieldWidgetTest extends FileFieldTestBase {
    * Tests file widget element.
    */
   public function testWidgetElement() {
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $html_name = str_replace('_', '-', $field_name);
     $this->createFileField($field_name, 'node', 'article', ['cardinality' => FieldStorageConfig::CARDINALITY_UNLIMITED]);
     $file = $this->getTestFile('text');
@@ -477,7 +477,7 @@ class FileFieldWidgetTest extends FileFieldTestBase {
     user_role_grant_permissions($this->adminUser->roles[0]->target_id, ['administer node fields']);
 
     $type_name = 'article';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createFileField($field_name, 'node', $type_name);
     /** @var \Drupal\Field\FieldConfigInterface $field */
     $field = FieldConfig::loadByName('node', $type_name, $field_name);
@@ -504,7 +504,7 @@ class FileFieldWidgetTest extends FileFieldTestBase {
     user_role_grant_permissions($this->adminUser->roles[0]->target_id, ['administer node fields']);
 
     $type_name = 'article';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createFileField($field_name, 'node', $type_name);
     $field = FieldConfig::loadByName('node', $type_name, $field_name);
     $field_id = $field->id();

core/modules/file/tests/src/Functional/FileOnTranslatedEntityTest.php

@@ -45,7 +45,7 @@ class FileOnTranslatedEntityTest extends FileFieldTestBase {
     $this->drupalCreateContentType(['type' => 'page', 'name' => 'Basic page', 'new_revision' => FALSE]);
 
     // Create a file field on the "Basic page" node type.
-    $this->fieldName = strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
     $this->createFileField($this->fieldName, 'node', 'page');
 
     // Create and log in user.

core/modules/file/tests/src/Functional/FilePrivateTest.php

@@ -47,7 +47,7 @@ class FilePrivateTest extends FileFieldTestBase {
     /** @var \Drupal\Core\File\FileSystemInterface $file_system */
     $file_system = \Drupal::service('file_system');
     $type_name = 'article';
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createFileField($field_name, 'node', $type_name, ['uri_scheme' => 'private']);
 
     $test_file = $this->getTestFile('text');

core/modules/file/tests/src/Functional/FileTokenReplaceTest.php

@@ -31,7 +31,7 @@ class FileTokenReplaceTest extends FileFieldTestBase {
 
     // Create file field.
     $type_name = 'article';
-    $field_name = 'field_' . strtolower($this->randomMachineName());
+    $field_name = 'field_' . $this->randomMachineName();
     $this->createFileField($field_name, 'node', $type_name);
 
     $test_file = $this->getTestFile('text');

core/modules/file/tests/src/Functional/Formatter/FileMediaFormatterTestBase.php

@@ -46,7 +46,7 @@ abstract class FileMediaFormatterTestBase extends BrowserTestBase {
    */
   protected function createMediaField($formatter, $file_extensions, array $formatter_settings = []) {
     $entity_type = $bundle = 'entity_test';
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
 
     FieldStorageConfig::create([
       'entity_type' => $entity_type,

core/modules/file/tests/src/Functional/PrivateFileOnTranslatedEntityTest.php

@@ -39,7 +39,7 @@ class PrivateFileOnTranslatedEntityTest extends FileFieldTestBase {
     $this->drupalCreateContentType(['type' => 'page', 'name' => 'Basic page']);
 
     // Create a file field on the "Basic page" node type.
-    $this->fieldName = strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
     $this->createFileField($this->fieldName, 'node', 'page', ['uri_scheme' => 'private']);
 
     // Create and log in user.

core/modules/file/tests/src/FunctionalJavascript/FileFieldValidateTest.php

@@ -33,7 +33,7 @@ class FileFieldValidateTest extends WebDriverTestBase {
    * Tests the validation message is displayed only once for ajax uploads.
    */
   public function testAjaxValidationMessage() {
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->drupalCreateContentType(['type' => 'article', 'name' => 'Article']);
     $this->createFileField($field_name, 'node', 'article', [], ['file_extensions' => 'txt']);
 

core/modules/filter/tests/src/Functional/FilterAdminTest.php

@@ -129,7 +129,7 @@ class FilterAdminTest extends BrowserTestBase {
     // Add text format.
     $this->drupalGet('admin/config/content/formats');
     $this->clickLink('Add text format');
-    $format_id = mb_strtolower($this->randomMachineName());
+    $format_id = $this->randomMachineName();
     $name = $this->randomMachineName();
     $edit = [
       'format' => $format_id,
@@ -248,7 +248,7 @@ class FilterAdminTest extends BrowserTestBase {
 
     // Add format.
     $edit = [];
-    $edit['format'] = mb_strtolower($this->randomMachineName());
+    $edit['format'] = $this->randomMachineName();
     $edit['name'] = $this->randomMachineName();
     $edit['roles[' . RoleInterface::AUTHENTICATED_ID . ']'] = 1;
     $edit['filters[' . $second_filter . '][status]'] = TRUE;
@@ -412,14 +412,14 @@ class FilterAdminTest extends BrowserTestBase {
    */
   public function testDisabledFormat() {
     // Create a node type and add a standard body field.
-    $node_type = NodeType::create(['type' => mb_strtolower($this->randomMachineName())]);
+    $node_type = NodeType::create(['type' => $this->randomMachineName()]);
     $node_type->save();
     node_add_body_field($node_type, $this->randomString());
 
     // Create a text format with a filter that returns a static string.
     $format = FilterFormat::create([
       'name' => $this->randomString(),
-      'format' => $format_id = mb_strtolower($this->randomMachineName()),
+      'format' => $format_id = $this->randomMachineName(),
     ]);
     $format->setFilterConfig('filter_static_text', ['status' => TRUE]);
     $format->save();

core/modules/filter/tests/src/Functional/FilterDefaultFormatTest.php

@@ -35,7 +35,7 @@ class FilterDefaultFormatTest extends BrowserTestBase {
     $formats = [];
     for ($i = 0; $i < 2; $i++) {
       $edit = [
-        'format' => mb_strtolower($this->randomMachineName()),
+        'format' => $this->randomMachineName(),
         'name' => $this->randomMachineName(),
       ];
       $this->drupalGet('admin/config/content/formats/add');

core/modules/filter/tests/src/Functional/FilterFormatAccessTest.php

@@ -94,7 +94,7 @@ class FilterFormatAccessTest extends BrowserTestBase {
     $formats = [];
     for ($i = 0; $i < 3; $i++) {
       $edit = [
-        'format' => mb_strtolower($this->randomMachineName()),
+        'format' => $this->randomMachineName(),
         'name' => $this->randomMachineName(),
       ];
       $this->drupalGet('admin/config/content/formats/add');

core/modules/filter/tests/src/Functional/FilterHooksTest.php

@@ -32,7 +32,7 @@ class FilterHooksTest extends BrowserTestBase {
    */
   public function testFilterHooks() {
     // Create content type, with underscores.
-    $type_name = 'test_' . strtolower($this->randomMachineName());
+    $type_name = 'test_' . $this->randomMachineName();
     $type = $this->drupalCreateContentType(['name' => $type_name, 'type' => $type_name]);
     $node_permission = "create $type_name content";
 
@@ -46,7 +46,7 @@ class FilterHooksTest extends BrowserTestBase {
     // Add a text format.
     $name = $this->randomMachineName();
     $edit = [];
-    $edit['format'] = mb_strtolower($this->randomMachineName());
+    $edit['format'] = $this->randomMachineName();
     $edit['name'] = $name;
     $edit['roles[' . RoleInterface::ANONYMOUS_ID . ']'] = 1;
     $this->drupalGet('admin/config/content/formats/add');

core/modules/image/tests/src/Functional/ImageAdminStylesTest.php

@@ -80,7 +80,7 @@ class ImageAdminStylesTest extends ImageFieldTestBase {
     $admin_path = 'admin/config/media/image-styles';
 
     // Setup a style to be created and effects to add to it.
-    $style_name = strtolower($this->randomMachineName(10));
+    $style_name = $this->randomMachineName(10);
     $style_label = $this->randomString();
     $style_path = $admin_path . '/manage/' . $style_name;
     $effect_edits = [
@@ -197,7 +197,7 @@ class ImageAdminStylesTest extends ImageFieldTestBase {
 
     // Test the style overview form.
     // Change the name of the style and adjust the weights of effects.
-    $style_name = strtolower($this->randomMachineName(10));
+    $style_name = $this->randomMachineName(10);
     $style_label = $this->randomMachineName();
     $weight = count($effect_edits);
     $edit = [
@@ -317,14 +317,14 @@ class ImageAdminStylesTest extends ImageFieldTestBase {
    */
   public function testStyleReplacement() {
     // Create a new style.
-    $style_name = strtolower($this->randomMachineName(10));
+    $style_name = $this->randomMachineName(10);
     $style_label = $this->randomString();
     $style = ImageStyle::create(['name' => $style_name, 'label' => $style_label]);
     $style->save();
     $style_path = 'admin/config/media/image-styles/manage/';
 
     // Create an image field that uses the new style.
-    $field_name = strtolower($this->randomMachineName(10));
+    $field_name = $this->randomMachineName(10);
     $this->createImageField($field_name, 'article');
     \Drupal::service('entity_display.repository')
       ->getViewDisplay('node', 'article')
@@ -351,7 +351,7 @@ class ImageAdminStylesTest extends ImageFieldTestBase {
     $this->assertSession()->responseContains($file_url_generator->transformRelative($style->buildUrl($original_uri)));
 
     // Rename the style and make sure the image field is updated.
-    $new_style_name = strtolower($this->randomMachineName(10));
+    $new_style_name = $this->randomMachineName(10);
     $new_style_label = $this->randomString();
     $edit = [
       'name' => $new_style_name,
@@ -441,7 +441,7 @@ class ImageAdminStylesTest extends ImageFieldTestBase {
     $admin_path = 'admin/config/media/image-styles';
 
     // Create a new style.
-    $style_name = strtolower($this->randomMachineName(10));
+    $style_name = $this->randomMachineName(10);
     $style = ImageStyle::create(['name' => $style_name, 'label' => $this->randomString()]);
     $style->save();
 
@@ -471,13 +471,13 @@ class ImageAdminStylesTest extends ImageFieldTestBase {
    */
   public function testConfigImport() {
     // Create a new style.
-    $style_name = strtolower($this->randomMachineName(10));
+    $style_name = $this->randomMachineName(10);
     $style_label = $this->randomString();
     $style = ImageStyle::create(['name' => $style_name, 'label' => $style_label]);
     $style->save();
 
     // Create an image field that uses the new style.
-    $field_name = strtolower($this->randomMachineName(10));
+    $field_name = $this->randomMachineName(10);
     $this->createImageField($field_name, 'article');
     \Drupal::service('entity_display.repository')
       ->getViewDisplay('node', 'article')

core/modules/image/tests/src/Functional/ImageFieldDefaultImagesTest.php

@@ -62,7 +62,7 @@ class ImageFieldDefaultImagesTest extends ImageFieldTestBase {
 
     // Create an image field storage and add a field to the article content
     // type.
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $storage_settings['default_image'] = [
       'uuid' => $default_images['field_storage']->uuid(),
       'alt' => '',
@@ -261,7 +261,7 @@ class ImageFieldDefaultImagesTest extends ImageFieldTestBase {
    */
   public function testInvalidDefaultImage() {
     $field_storage = FieldStorageConfig::create([
-      'field_name' => mb_strtolower($this->randomMachineName()),
+      'field_name' => $this->randomMachineName(),
       'entity_type' => 'node',
       'type' => 'image',
       'settings' => [

core/modules/image/tests/src/Functional/ImageFieldDisplayTest.php

@@ -59,7 +59,7 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
     /** @var \Drupal\Core\Render\RendererInterface $renderer */
     $renderer = $this->container->get('renderer');
     $node_storage = $this->container->get('entity_type.manager')->getStorage('node');
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_settings = ['alt_field_required' => 0];
     $instance = $this->createImageField($field_name, 'article', ['uri_scheme' => $scheme], $field_settings);
 
@@ -246,7 +246,7 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
     $node_storage = $this->container->get('entity_type.manager')->getStorage('node');
     $test_image = current($this->drupalGetTestFiles('image'));
     [, $test_image_extension] = explode('.', $test_image->filename);
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_settings = [
       'alt_field' => 1,
       'file_extensions' => $test_image_extension,
@@ -364,7 +364,7 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
     /** @var \Drupal\Core\Render\RendererInterface $renderer */
     $renderer = $this->container->get('renderer');
     $node_storage = $this->container->get('entity_type.manager')->getStorage('node');
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_settings = ['alt_field_required' => 0];
     $instance = $this->createImageField($field_name, 'article', [], $field_settings);
 
@@ -480,7 +480,7 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
 
     $node_storage = $this->container->get('entity_type.manager')->getStorage('node');
     // Create a new image field.
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createImageField($field_name, 'article');
 
     // Create a new node, with no images and verify that no images are
@@ -569,7 +569,7 @@ class ImageFieldDisplayTest extends ImageFieldTestBase {
     $this->assertEmpty($default_image['uuid'], 'Default image removed from field.');
     // Create an image field that uses the private:// scheme and test that the
     // default image works as expected.
-    $private_field_name = strtolower($this->randomMachineName());
+    $private_field_name = $this->randomMachineName();
     $this->createImageField($private_field_name, 'article', ['uri_scheme' => 'private']);
     // Add a default image to the new field.
     $edit = [

core/modules/image/tests/src/Functional/ImageFieldValidateTest.php

@@ -29,7 +29,7 @@ class ImageFieldValidateTest extends ImageFieldTestBase {
     $file_system = $this->container->get('file_system');
     $image_files = $this->drupalGetTestFiles('image');
 
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createImageField($field_name, 'article', [], ['file_directory' => 'test-upload']);
     $expected_path = 'public://test-upload';
 
@@ -89,9 +89,9 @@ class ImageFieldValidateTest extends ImageFieldTestBase {
    */
   public function testResolution() {
     $field_names = [
-      0 => strtolower($this->randomMachineName()),
+      0 => $this->randomMachineName(),
-      1 => strtolower($this->randomMachineName()),
+      1 => $this->randomMachineName(),
-      2 => strtolower($this->randomMachineName()),
+      2 => $this->randomMachineName(),
     ];
     $min_resolution = [
       'width' => 50,
@@ -163,7 +163,7 @@ class ImageFieldValidateTest extends ImageFieldTestBase {
    * Tests that required alt/title fields gets validated right.
    */
   public function testRequiredAttributes() {
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_settings = [
       'alt_field' => 1,
       'alt_field_required' => 1,

core/modules/image/tests/src/Functional/ImageFieldWidgetTest.php

@@ -21,7 +21,7 @@ class ImageFieldWidgetTest extends ImageFieldTestBase {
    */
   public function testWidgetElement() {
     // Check for image widget in add/node/article page
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $min_resolution = 50;
     $max_resolution = 100;
     $field_settings = [

core/modules/image/tests/src/Functional/ImageOnTranslatedEntityTest.php

@@ -49,7 +49,7 @@ class ImageOnTranslatedEntityTest extends ImageFieldTestBase {
     $this->drupalCreateContentType(['type' => 'basicpage', 'name' => 'Basic page', 'new_revision' => FALSE]);
 
     // Create an image field on the "Basic page" node type.
-    $this->fieldName = strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
     $this->createImageField($this->fieldName, 'basicpage', [], ['title_field' => 1]);
 
     // Create and log in user.

core/modules/image/tests/src/Functional/ImageStyleFlushTest.php

@@ -60,7 +60,7 @@ class ImageStyleFlushTest extends ImageFieldTestBase {
   public function testFlush() {
 
     // Setup a style to be created and effects to add to it.
-    $style_name = strtolower($this->randomMachineName(10));
+    $style_name = $this->randomMachineName(10);
     $style_label = $this->randomString();
     $style_path = 'admin/config/media/image-styles/manage/' . $style_name;
     $effect_edits = [

core/modules/image/tests/src/FunctionalJavascript/ImageAdminStylesTest.php

@@ -23,7 +23,7 @@ class ImageAdminStylesTest extends ImageFieldTestBase {
     $admin_path = 'admin/config/media/image-styles';
 
     // Setup a style to be created and effects to add to it.
-    $style_name = strtolower($this->randomMachineName(10));
+    $style_name = $this->randomMachineName(10);
     $style_label = $this->randomString();
     $style_path = $admin_path . '/manage/' . $style_name;
     $effect_edit = [

core/modules/image/tests/src/FunctionalJavascript/ImageFieldValidateTest.php

@@ -21,7 +21,7 @@ class ImageFieldValidateTest extends ImageFieldTestBase {
    * Tests the validation message is displayed only once for ajax uploads.
    */
   public function testAJAXValidationMessage() {
-    $field_name = strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->createImageField($field_name, 'article', ['cardinality' => -1]);
 
     $this->drupalGet('node/add/article');

core/modules/image/tests/src/Kernel/ImageFormatterTest.php

@@ -58,7 +58,7 @@ class ImageFormatterTest extends FieldKernelTestBase {
 
     $this->entityType = 'entity_test';
     $this->bundle = $this->entityType;
-    $this->fieldName = mb_strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
 
     FieldStorageConfig::create([
       'entity_type' => $this->entityType,

core/modules/language/tests/src/Functional/ConfigurableLanguageManagerTest.php

@@ -212,8 +212,8 @@ class ConfigurableLanguageManagerTest extends BrowserTestBase {
     ]);
 
     // Create a field on the user entity.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
-    $label = mb_strtolower($this->randomMachineName());
+    $label = $this->randomMachineName();
     $field_label_en = "English $label";
     $field_label_es = "Español $label";
 

core/modules/link/tests/src/Functional/LinkFieldTest.php

@@ -86,7 +86,7 @@ class LinkFieldTest extends BrowserTestBase {
    * Tests link field URL validation.
    */
   protected function doTestURLValidation() {
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     // Create a field with settings to validate.
     $this->fieldStorage = FieldStorageConfig::create([
       'field_name' => $field_name,
@@ -270,7 +270,7 @@ class LinkFieldTest extends BrowserTestBase {
    * Tests the link title settings of a link field.
    */
   protected function doTestLinkTitle() {
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     // Create a field with settings to validate.
     $this->fieldStorage = FieldStorageConfig::create([
       'field_name' => $field_name,
@@ -395,7 +395,7 @@ class LinkFieldTest extends BrowserTestBase {
    * Tests the default 'link' formatter.
    */
   protected function doTestLinkFormatter() {
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     // Create a field with settings to validate.
     $this->fieldStorage = FieldStorageConfig::create([
       'field_name' => $field_name,
@@ -552,7 +552,7 @@ class LinkFieldTest extends BrowserTestBase {
    * merged, since they involve different configuration and output.
    */
   protected function doTestLinkSeparateFormatter() {
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     // Create a field with settings to validate.
     $this->fieldStorage = FieldStorageConfig::create([
       'field_name' => $field_name,
@@ -681,7 +681,7 @@ class LinkFieldTest extends BrowserTestBase {
   protected function doTestLinkTypeOnLinkWidget() {
 
     $link_type = LinkItemInterface::LINK_EXTERNAL;
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
 
     // Create a field with settings to validate.
     $this->fieldStorage = FieldStorageConfig::create([
@@ -779,7 +779,7 @@ class LinkFieldTest extends BrowserTestBase {
    * Tests <nolink> and <none> as link uri.
    */
   public function testNoLinkUri() {
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $this->fieldStorage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',

core/modules/media/tests/src/Functional/MediaTypeCreationTest.php

@@ -48,7 +48,7 @@ class MediaTypeCreationTest extends MediaFunctionalTestBase {
    * Data provider for testMediaTypeCreationForm().
    */
   public function providerMediaTypeCreationForm() {
-    $machine_name = mb_strtolower($this->randomMachineName());
+    $machine_name = $this->randomMachineName();
     return [
       [
         'Save',

core/modules/media/tests/src/FunctionalJavascript/MediaViewsWizardTest.php

@@ -29,7 +29,7 @@ class MediaViewsWizardTest extends MediaJavascriptTestBase {
 
     $this->createMediaType('test');
 
-    $view_id = strtolower($this->randomMachineName(16));
+    $view_id = $this->randomMachineName(16);
     $this->drupalGet('admin/structure/views/add');
     $page->fillField('label', $view_id);
     $this->waitUntilVisible('.machine-name-value');
@@ -63,7 +63,7 @@ class MediaViewsWizardTest extends MediaJavascriptTestBase {
     $page = $session->getPage();
     $assert_session = $this->assertSession();
 
-    $view_id = strtolower($this->randomMachineName(16));
+    $view_id = $this->randomMachineName(16);
     $this->drupalGet('admin/structure/views/add');
     $page->fillField('label', $view_id);
     $this->waitUntilVisible('.machine-name-value');

core/modules/menu_ui/tests/src/Functional/MenuUiLanguageTest.php

@@ -61,7 +61,7 @@ class MenuUiLanguageTest extends BrowserTestBase {
   public function testMenuLanguage() {
     // Create a test menu to test the various language-related settings.
     // Machine name has to be lowercase.
-    $menu_name = mb_strtolower($this->randomMachineName(16));
+    $menu_name = $this->randomMachineName(16);
     $label = $this->randomString();
     $edit = [
       'id' => $menu_name,

core/modules/menu_ui/tests/src/Functional/MenuUiTest.php

@@ -226,7 +226,7 @@ class MenuUiTest extends BrowserTestBase {
    */
   public function addCustomMenuCRUD() {
     // Add a new custom menu.
-    $menu_name = strtolower($this->randomMachineName(MenuStorage::MAX_ID_LENGTH));
+    $menu_name = $this->randomMachineName(MenuStorage::MAX_ID_LENGTH);
     $label = $this->randomMachineName(16);
 
     $menu = Menu::create([
@@ -267,7 +267,7 @@ class MenuUiTest extends BrowserTestBase {
   public function addCustomMenu() {
     // Try adding a menu using a menu_name that is too long.
     $this->drupalGet('admin/structure/menu/add');
-    $menu_name = strtolower($this->randomMachineName(MenuStorage::MAX_ID_LENGTH + 1));
+    $menu_name = $this->randomMachineName(MenuStorage::MAX_ID_LENGTH + 1);
     $label = $this->randomMachineName(16);
     $edit = [
       'id' => $menu_name,
@@ -282,7 +282,7 @@ class MenuUiTest extends BrowserTestBase {
     $this->assertSession()->pageTextContains("Menu name cannot be longer than " . MenuStorage::MAX_ID_LENGTH . " characters but is currently " . mb_strlen($menu_name) . " characters long.");
 
     // Change the menu_name so it no longer exceeds the maximum length.
-    $menu_name = strtolower($this->randomMachineName(MenuStorage::MAX_ID_LENGTH));
+    $menu_name = $this->randomMachineName(MenuStorage::MAX_ID_LENGTH);
     $edit['id'] = $menu_name;
     $this->drupalGet('admin/structure/menu/add');
     $this->submitForm($edit, 'Save');

core/modules/menu_ui/tests/src/FunctionalJavascript/MenuUiJavascriptTest.php

@@ -75,7 +75,7 @@ class MenuUiJavascriptTest extends WebDriverTestBase {
   protected function addCustomMenu() {
     // Try adding a menu using a menu_name that is too long.
     $label = $this->randomMachineName(16);
-    $menu_id = strtolower($this->randomMachineName(MenuStorage::MAX_ID_LENGTH + 1));
+    $menu_id = $this->randomMachineName(MenuStorage::MAX_ID_LENGTH + 1);
 
     $this->drupalGet('admin/structure/menu/add');
     $page = $this->getSession()->getPage();

core/modules/migrate/tests/src/Kernel/MigrateEntityContentValidationTest.php

@@ -188,7 +188,7 @@ class MigrateEntityContentValidationTest extends KernelTestBase {
     $normal_user->save();
 
     // Add a "body" field with the text format.
-    $field_name = mb_strtolower($this->randomMachineName());
+    $field_name = $this->randomMachineName();
     $field_storage = FieldStorageConfig::create([
       'field_name' => $field_name,
       'entity_type' => 'entity_test',

core/modules/node/tests/src/Functional/MultiStepNodeFormBasicOptionsTest.php

@@ -36,7 +36,7 @@ class MultiStepNodeFormBasicOptionsTest extends NodeTestBase {
     $this->drupalLogin($web_user);
 
     // Create an unlimited cardinality field.
-    $this->fieldName = mb_strtolower($this->randomMachineName());
+    $this->fieldName = $this->randomMachineName();
     FieldStorageConfig::create([
       'field_name' => $this->fieldName,
       'entity_type' => 'node',