diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php
index 2780507a97f..c977b772792 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php
@@ -45,7 +45,7 @@ class MigrateAggregatorItemTest extends MigrateDrupal7TestBase {
       $this->assertSame($original->fid, $item->getFeedId());
       $this->assertSame($original->title, $item->label());
       // If $original->author is an empty string, getAuthor() returns NULL so
-      // we need to use assertEqual() here.
+      // we need to use assertEquals() here.
       $this->assertEquals($original->author, $item->getAuthor());
       $this->assertSame($original->description, $item->getDescription());
       $this->assertSame($original->link, $item->getLink());
diff --git a/core/modules/field/tests/modules/field_test/field_test.module b/core/modules/field/tests/modules/field_test/field_test.module
index 8b987467df0..2ec952dd196 100644
--- a/core/modules/field/tests/modules/field_test/field_test.module
+++ b/core/modules/field/tests/modules/field_test/field_test.module
@@ -49,8 +49,8 @@ require_once __DIR__ . '/field_test.field.inc';
  *   $mem = field_test_memorize();
  *
  *   // make sure hook_field_storage_config_create() is invoked correctly
- *   assertEqual(count($mem['field_test_field_storage_config_create']), 1);
- *   assertEqual($mem['field_test_field_storage_config_create'][0], array($field));
+ *   assertEquals(1, count($mem['field_test_field_storage_config_create']));
+ *   assertEquals(array($field), $mem['field_test_field_storage_config_create'][0]);
  * @endcode
  *
  * @param $key
diff --git a/core/modules/system/tests/modules/plugin_test/src/Plugin/MockBlockManager.php b/core/modules/system/tests/modules/plugin_test/src/Plugin/MockBlockManager.php
index ef8d6c47905..766aa7a8d53 100644
--- a/core/modules/system/tests/modules/plugin_test/src/Plugin/MockBlockManager.php
+++ b/core/modules/system/tests/modules/plugin_test/src/Plugin/MockBlockManager.php
@@ -138,7 +138,7 @@ class MockBlockManager extends PluginManagerBase {
    */
   protected function createContextDefinition($data_type, $label, $required = TRUE) {
     // We cast the label to string for testing purposes only, as it may be
-    // a TranslatableMarkup and we will do assertEqual() checks on arrays that
+    // a TranslatableMarkup and we will do assertEquals() checks on arrays that
     // include ContextDefinition objects, and var_export() has problems
     // printing TranslatableMarkup objects.
     $class = ContextDefinition::class;