diff --git a/core/modules/ckeditor5/src/Plugin/Editor/CKEditor5.php b/core/modules/ckeditor5/src/Plugin/Editor/CKEditor5.php
index 8482acffa1dfd5d684292da57cae6a85c8f655ef..66668eed18eb4feeab7514ef75d75028fc5f8746 100644
--- a/core/modules/ckeditor5/src/Plugin/Editor/CKEditor5.php
+++ b/core/modules/ckeditor5/src/Plugin/Editor/CKEditor5.php
@@ -859,7 +859,6 @@ protected static function createEphemeralPairedEditor(EditorInterface $editor, F
     $paired_editor->enforceIsNew(TRUE);
     $reflector = new \ReflectionObject($paired_editor);
     $property = $reflector->getProperty('filterFormat');
-    $property->setAccessible(TRUE);
     $property->setValue($paired_editor, clone $filter_format);
     return $paired_editor;
   }
diff --git a/core/modules/ckeditor5/src/SmartDefaultSettings.php b/core/modules/ckeditor5/src/SmartDefaultSettings.php
index 4a17e004f1a28ed20431d105b4bdc07f354b4d5e..5d3e0b243947bc02145191fb54b740fa445c2f92 100644
--- a/core/modules/ckeditor5/src/SmartDefaultSettings.php
+++ b/core/modules/ckeditor5/src/SmartDefaultSettings.php
@@ -125,7 +125,6 @@ public function computeSmartDefaultSettings(?EditorInterface $text_editor, Filte
       // @todo Remove in https://www.drupal.org/project/drupal/issues/3231347.
       $reflector = new \ReflectionObject($text_editor);
       $property = $reflector->getProperty('filterFormat');
-      $property->setAccessible(TRUE);
       $property->setValue($text_editor, $text_format);
     }
 
diff --git a/core/modules/ckeditor5/tests/src/Traits/PrivateMethodUnitTestTrait.php b/core/modules/ckeditor5/tests/src/Traits/PrivateMethodUnitTestTrait.php
index e4e69ee25ca5d8eb51986b2c766203f300c7cf02..9a2a2c7210f832b00f0b7f408c0032a02ea6d291 100644
--- a/core/modules/ckeditor5/tests/src/Traits/PrivateMethodUnitTestTrait.php
+++ b/core/modules/ckeditor5/tests/src/Traits/PrivateMethodUnitTestTrait.php
@@ -23,7 +23,6 @@ trait PrivateMethodUnitTestTrait {
   protected static function getMethod(string $fqcn, string $name): \ReflectionMethod {
     $class = new \ReflectionClass($fqcn);
     $method = $class->getMethod($name);
-    $method->setAccessible(TRUE);
     return $method;
   }
 
diff --git a/core/modules/comment/tests/src/Unit/Plugin/views/field/CommentBulkFormTest.php b/core/modules/comment/tests/src/Unit/Plugin/views/field/CommentBulkFormTest.php
index 6a9aded8c94537d8c8a771d66269fc88d073024e..e4aa6dae605032fdd38d78a6867168d1487289d4 100644
--- a/core/modules/comment/tests/src/Unit/Plugin/views/field/CommentBulkFormTest.php
+++ b/core/modules/comment/tests/src/Unit/Plugin/views/field/CommentBulkFormTest.php
@@ -94,7 +94,6 @@ public function testConstructor() {
     $comment_bulk_form->init($executable, $display, $options);
 
     $reflected_actions = (new \ReflectionObject($comment_bulk_form))->getProperty('actions');
-    $reflected_actions->setAccessible(TRUE);
     $this->assertEquals(array_slice($actions, 0, -1, TRUE), $reflected_actions->getValue($comment_bulk_form));
   }
 
diff --git a/core/modules/content_moderation/tests/src/Unit/ContentModerationRouteSubscriberTest.php b/core/modules/content_moderation/tests/src/Unit/ContentModerationRouteSubscriberTest.php
index 10ab1b0ca89dc25efceabda77790c2c8d2c6d9ec..01125ef764843ede1d4017706db600e3f80f337d 100644
--- a/core/modules/content_moderation/tests/src/Unit/ContentModerationRouteSubscriberTest.php
+++ b/core/modules/content_moderation/tests/src/Unit/ContentModerationRouteSubscriberTest.php
@@ -61,7 +61,6 @@ protected function setupEntityTypes() {
     ];
 
     $reflector = new \ReflectionProperty($this->routeSubscriber, 'moderatedEntityTypes');
-    $reflector->setAccessible(TRUE);
     $reflector->setValue($this->routeSubscriber, $entity_types);
   }
 
diff --git a/core/modules/field_ui/tests/src/Unit/FieldConfigEditFormTest.php b/core/modules/field_ui/tests/src/Unit/FieldConfigEditFormTest.php
index 04ecaf4ecd5a5fe1e49fafb9c6a4f461ca3696e9..00267079bcb30aaa8b49fbbd7d7c901f6131bdbc 100644
--- a/core/modules/field_ui/tests/src/Unit/FieldConfigEditFormTest.php
+++ b/core/modules/field_ui/tests/src/Unit/FieldConfigEditFormTest.php
@@ -38,7 +38,6 @@ protected function setUp(): void {
   public function testHasAnyRequired(array $element, bool $result) {
     $reflection = new \ReflectionClass('\Drupal\field_ui\Form\FieldConfigEditForm');
     $method = $reflection->getMethod('hasAnyRequired');
-    $method->setAccessible(TRUE);
     $this->assertEquals($result, $method->invoke($this->fieldConfigEditForm, $element));
   }
 
diff --git a/core/modules/filter/tests/src/Kernel/Migrate/d6/FilterFormatPermissionTest.php b/core/modules/filter/tests/src/Kernel/Migrate/d6/FilterFormatPermissionTest.php
index dcdf97b90359bcb5e516d0bdb7c637c1609ff1d7..e3dff1116bf353e957b0cfd2498d2537fc8555b3 100644
--- a/core/modules/filter/tests/src/Kernel/Migrate/d6/FilterFormatPermissionTest.php
+++ b/core/modules/filter/tests/src/Kernel/Migrate/d6/FilterFormatPermissionTest.php
@@ -24,7 +24,6 @@ public function testConfigurableFilterFormat() {
     $migration = Migration::create($this->container, [], 'custom_migration', []);
     $filterFormatPermissionMigration = FilterFormatPermission::create($this->container, ['migration' => 'custom_filter_format'], 'custom_filter_format', [], $migration);
     $reflected_config = new \ReflectionProperty($filterFormatPermissionMigration, 'configuration');
-    $reflected_config->setAccessible(TRUE);
     $config = $reflected_config->getValue($filterFormatPermissionMigration);
     $this->assertEquals('custom_filter_format', $config['migration']);
   }
diff --git a/core/modules/forum/tests/src/Unit/Breadcrumb/ForumBreadcrumbBuilderBaseTest.php b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumBreadcrumbBuilderBaseTest.php
index 062b8a958f755092860de4f055e7712c6d380139..9d4c3ff64d7861e81da30b1c7b09de236f52b98d 100644
--- a/core/modules/forum/tests/src/Unit/Breadcrumb/ForumBreadcrumbBuilderBaseTest.php
+++ b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumBreadcrumbBuilderBaseTest.php
@@ -60,7 +60,6 @@ public function testConstructor() {
     // Test that the constructor made a config object with our info in it.
     $reflector = new \ReflectionClass($builder);
     $ref_property = $reflector->getProperty('config');
-    $ref_property->setAccessible(TRUE);
     $config = $ref_property->getValue($builder);
     $this->assertEquals('IAmATestValue', $config->get('IAmATestKey'));
   }
diff --git a/core/modules/jsonapi/tests/src/Kernel/Query/FilterTest.php b/core/modules/jsonapi/tests/src/Kernel/Query/FilterTest.php
index c9bae28c113326bf2865f6523bac6cc7f6d0a31d..dad459c3dae86e0e0f28679fe03c6f2223addbea 100644
--- a/core/modules/jsonapi/tests/src/Kernel/Query/FilterTest.php
+++ b/core/modules/jsonapi/tests/src/Kernel/Query/FilterTest.php
@@ -154,14 +154,11 @@ public function testQueryCondition() {
       // Expose parts of \Drupal\Core\Entity\Query\Sql\Query::execute().
       $o = new \ReflectionObject($entity_query);
       $m1 = $o->getMethod('prepare');
-      $m1->setAccessible(TRUE);
       $m2 = $o->getMethod('compile');
-      $m2->setAccessible(TRUE);
 
       // The private property computed by the two previous private calls, whose
       // value we need to inspect.
       $p = $o->getProperty('sqlQuery');
-      $p->setAccessible(TRUE);
 
       $m1->invoke($entity_query);
       $m2->invoke($entity_query);
diff --git a/core/modules/jsonapi/tests/src/Kernel/ResourceType/ResourceTypeRepositoryTest.php b/core/modules/jsonapi/tests/src/Kernel/ResourceType/ResourceTypeRepositoryTest.php
index 40f4391944a408d78c6939071610184d70c020ae..e7d5216e5c5eb7823a589d1d4ef1a4aedbc19b1d 100644
--- a/core/modules/jsonapi/tests/src/Kernel/ResourceType/ResourceTypeRepositoryTest.php
+++ b/core/modules/jsonapi/tests/src/Kernel/ResourceType/ResourceTypeRepositoryTest.php
@@ -124,7 +124,6 @@ public function testMappingNameConflictCheck($field_name_list) {
     $bundle = 'article';
     $reflection_class = new \ReflectionClass($this->resourceTypeRepository);
     $reflection_method = $reflection_class->getMethod('getFields');
-    $reflection_method->setAccessible(TRUE);
 
     $this->expectException(\LogicException::class);
     $this->expectExceptionMessage("The generated alias '{$field_name_list[1]}' for field name '{$field_name_list[0]}' conflicts with an existing field. Please report this in the JSON:API issue queue!");
diff --git a/core/modules/jsonapi/tests/src/Unit/EventSubscriber/ResourceResponseValidatorTest.php b/core/modules/jsonapi/tests/src/Unit/EventSubscriber/ResourceResponseValidatorTest.php
index a2fb19c5f86ad50510e911e282ed9300bfd38204..7a34a41a6252a0d3df0eab283f1177051b5733b4 100644
--- a/core/modules/jsonapi/tests/src/Unit/EventSubscriber/ResourceResponseValidatorTest.php
+++ b/core/modules/jsonapi/tests/src/Unit/EventSubscriber/ResourceResponseValidatorTest.php
@@ -103,7 +103,6 @@ public function testValidateResponse($request, $response, $expected, $descriptio
     // Expose protected ResourceResponseSubscriber::validateResponse() method.
     $object = new \ReflectionObject($this->subscriber);
     $method = $object->getMethod('validateResponse');
-    $method->setAccessible(TRUE);
 
     $this->assertSame($expected, $method->invoke($this->subscriber, $response, $request), $description);
   }
diff --git a/core/modules/layout_builder/tests/src/Unit/DefaultsSectionStorageTest.php b/core/modules/layout_builder/tests/src/Unit/DefaultsSectionStorageTest.php
index 578b1b663287a506fb042bb42975d822aa39a6f8..302658068a39cd0e1d2efe05d1b163c11c9fdcca 100644
--- a/core/modules/layout_builder/tests/src/Unit/DefaultsSectionStorageTest.php
+++ b/core/modules/layout_builder/tests/src/Unit/DefaultsSectionStorageTest.php
@@ -134,7 +134,6 @@ public function testExtractEntityFromRoute($success, $expected_entity_id, $value
     }
 
     $method = new \ReflectionMethod($this->plugin, 'extractEntityFromRoute');
-    $method->setAccessible(TRUE);
     $result = $method->invoke($this->plugin, $value, $defaults);
     if ($success) {
       $this->assertEquals('the_return_value', $result);
@@ -210,7 +209,6 @@ public function testExtractEntityFromRouteCreate() {
     $this->entityTypeManager->getStorage('entity_view_display')->willReturn($entity_storage->reveal());
 
     $method = new \ReflectionMethod($this->plugin, 'extractEntityFromRoute');
-    $method->setAccessible(TRUE);
     $result = $method->invoke($this->plugin, $value, []);
     $this->assertSame($expected, $result);
   }
diff --git a/core/modules/layout_builder/tests/src/Unit/OverridesSectionStorageTest.php b/core/modules/layout_builder/tests/src/Unit/OverridesSectionStorageTest.php
index 14f3576bafd2bdae3dfff95d3858f84749c2cb6d..4e7fd27d4180c9f6e95c263c1879e4aad3c121af 100644
--- a/core/modules/layout_builder/tests/src/Unit/OverridesSectionStorageTest.php
+++ b/core/modules/layout_builder/tests/src/Unit/OverridesSectionStorageTest.php
@@ -106,7 +106,6 @@ public function testExtractEntityFromRoute($success, $expected_entity_type_id, $
     }
 
     $method = new \ReflectionMethod($this->plugin, 'extractEntityFromRoute');
-    $method->setAccessible(TRUE);
     $result = $method->invoke($this->plugin, $value, $defaults);
     if ($success) {
       $this->assertInstanceOf(FieldableEntityInterface::class, $result);
diff --git a/core/modules/layout_builder/tests/src/Unit/SectionStorageManagerTest.php b/core/modules/layout_builder/tests/src/Unit/SectionStorageManagerTest.php
index 0c13e5ddd14e03a635e82d2878735e7e662ec70f..50d11c371a128cebacd7436b1fcf65c94d1b3952 100644
--- a/core/modules/layout_builder/tests/src/Unit/SectionStorageManagerTest.php
+++ b/core/modules/layout_builder/tests/src/Unit/SectionStorageManagerTest.php
@@ -73,14 +73,12 @@ protected function setUp(): void {
 
     $this->discovery = $this->prophesize(DiscoveryInterface::class);
     $reflection_property = new \ReflectionProperty($this->manager, 'discovery');
-    $reflection_property->setAccessible(TRUE);
     $reflection_property->setValue($this->manager, $this->discovery->reveal());
 
     $this->plugin = $this->prophesize(SectionStorageInterface::class);
     $this->factory = $this->prophesize(FactoryInterface::class);
     $this->factory->createInstance('the_plugin_id', [])->willReturn($this->plugin->reveal());
     $reflection_property = new \ReflectionProperty($this->manager, 'factory');
-    $reflection_property->setAccessible(TRUE);
     $reflection_property->setValue($this->manager, $this->factory->reveal());
   }
 
diff --git a/core/modules/locale/tests/src/Unit/LocaleLookupTest.php b/core/modules/locale/tests/src/Unit/LocaleLookupTest.php
index bcc09c250cfad6b8d87cc35a1ea4906f80682335..59b439354a10f17c534423c7029529cf4078203e 100644
--- a/core/modules/locale/tests/src/Unit/LocaleLookupTest.php
+++ b/core/modules/locale/tests/src/Unit/LocaleLookupTest.php
@@ -363,7 +363,6 @@ public function testGetCid(array $roles, $expected) {
 
     $o = new \ReflectionObject($locale_lookup);
     $method = $o->getMethod('getCid');
-    $method->setAccessible(TRUE);
     $cid = $method->invoke($locale_lookup, 'getCid');
 
     $this->assertEquals($expected, $cid);
diff --git a/core/modules/menu_link_content/tests/src/Unit/MenuLinkPluginTest.php b/core/modules/menu_link_content/tests/src/Unit/MenuLinkPluginTest.php
index a6af5800c6b697be0c7ee16a7d02dc89a92a2c2b..1643a55ad9a11c3b636392f598c472bf1fba1d34 100644
--- a/core/modules/menu_link_content/tests/src/Unit/MenuLinkPluginTest.php
+++ b/core/modules/menu_link_content/tests/src/Unit/MenuLinkPluginTest.php
@@ -23,7 +23,6 @@ public function testGetInstanceReflection() {
 
     $class = new \ReflectionClass(MenuLinkContent::class);
     $instance_method = $class->getMethod('getUuid');
-    $instance_method->setAccessible(TRUE);
 
     $this->assertEquals('test_id', $instance_method->invoke($menu_link_content_plugin));
   }
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateSqlSourceTestBase.php b/core/modules/migrate/tests/src/Kernel/MigrateSqlSourceTestBase.php
index ba11c234a667463cc61fddf8d6686f0cc87aaf03..da3414ffa857a9b44a37a2d99020f7e3101e322f 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateSqlSourceTestBase.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateSqlSourceTestBase.php
@@ -91,7 +91,6 @@ public function testSource(array $source_data, array $expected_data, $expected_c
     // reflection hack to set it in the plugin instance.
     $reflector = new \ReflectionObject($plugin);
     $property = $reflector->getProperty('database');
-    $property->setAccessible(TRUE);
     $property->setValue($plugin, $this->getDatabase($source_data));
 
     /** @var MemoryCounterBackend $cache **/
@@ -99,7 +98,6 @@ public function testSource(array $source_data, array $expected_data, $expected_c
     if ($expected_cache_key) {
       // Verify the computed cache key.
       $property = $reflector->getProperty('cacheKey');
-      $property->setAccessible(TRUE);
       $this->assertSame($expected_cache_key, $property->getValue($plugin));
 
       // Cache miss prior to calling ::count().
diff --git a/core/modules/migrate/tests/src/Kernel/Plugin/source/MigrationSourceCacheTest.php b/core/modules/migrate/tests/src/Kernel/Plugin/source/MigrationSourceCacheTest.php
index 4be68c05a2ec708d611b738d05cb6dd2469cf296..4cf9804529adca57c0e84fe19de790f32624944d 100644
--- a/core/modules/migrate/tests/src/Kernel/Plugin/source/MigrationSourceCacheTest.php
+++ b/core/modules/migrate/tests/src/Kernel/Plugin/source/MigrationSourceCacheTest.php
@@ -83,7 +83,6 @@ public function testCacheCountsNotContaminated() {
 
     // Verify the cache keys are different.
     $cache_key_property = new \ReflectionProperty(SourcePluginBase::class, 'cacheKey');
-    $cache_key_property->setAccessible(TRUE);
     $this->assertNotEquals($cache_key_property->getValue($migration_1_source), $cache_key_property->getValue($migration_2_source));
   }
 
@@ -112,7 +111,6 @@ public function testCacheCountsUsed() {
 
     // Pollute the cache.
     $cache_key_property = new \ReflectionProperty($migration_source, 'cacheKey');
-    $cache_key_property->setAccessible(TRUE);
     $cache_key = $cache_key_property->getValue($migration_source);
     \Drupal::cache('migrate')->set($cache_key, 7);
     $this->assertCount(7, $migration_source);
diff --git a/core/modules/migrate/tests/src/Kernel/QueryBatchTest.php b/core/modules/migrate/tests/src/Kernel/QueryBatchTest.php
index d1583487631daa197ce2aaf33472baf89bc722ea..0fd188ae3e00383e4e9e24e1919427624723de80 100644
--- a/core/modules/migrate/tests/src/Kernel/QueryBatchTest.php
+++ b/core/modules/migrate/tests/src/Kernel/QueryBatchTest.php
@@ -156,7 +156,6 @@ public function testQueryBatch($source_data, $expected_data, $num_rows, $configu
     // reflection hack to set it in the plugin instance.
     $reflector = new \ReflectionObject($plugin);
     $property = $reflector->getProperty('database');
-    $property->setAccessible(TRUE);
 
     $connection = $this->getDatabase($source_data);
     $property->setValue($plugin, $connection);
@@ -183,7 +182,6 @@ public function testQueryBatch($source_data, $expected_data, $num_rows, $configu
       $expected_batch_size = $configuration['batch_size'];
     }
     $property = $reflector->getProperty('batchSize');
-    $property->setAccessible(TRUE);
     self::assertSame($expected_batch_size, $property->getValue($plugin));
 
     // Test the batch count.
@@ -194,7 +192,6 @@ public function testQueryBatch($source_data, $expected_data, $num_rows, $configu
       }
     }
     $property = $reflector->getProperty('batch');
-    $property->setAccessible(TRUE);
     self::assertSame($expected_batch_count, $property->getValue($plugin));
   }
 
diff --git a/core/modules/mysql/tests/src/Kernel/mysql/PrefixInfoTest.php b/core/modules/mysql/tests/src/Kernel/mysql/PrefixInfoTest.php
index 929cb649072475f9dea8919b5346bf8176fdbf0e..10835c0ae46d5811a4ad82089952c39585909392 100644
--- a/core/modules/mysql/tests/src/Kernel/mysql/PrefixInfoTest.php
+++ b/core/modules/mysql/tests/src/Kernel/mysql/PrefixInfoTest.php
@@ -33,21 +33,18 @@ public function testGetPrefixInfo() {
 
     // Get the prefix info for the first database.
     $method = new \ReflectionMethod($db1_schema, 'getPrefixInfo');
-    $method->setAccessible(TRUE);
     $db1_info = $method->invoke($db1_schema);
 
     // We change the database after opening the connection, so as to prevent
     // connecting to a non-existent database.
     $reflection = new \ReflectionObject($db2_connection);
     $property = $reflection->getProperty('connectionOptions');
-    $property->setAccessible(TRUE);
     $connection_info['default']['database'] = 'foobar';
     $property->setValue($db2_connection, $connection_info['default']);
 
     // For testing purposes, we also change the database info.
     $reflection_class = new \ReflectionClass(Database::class);
     $property = $reflection_class->getProperty('databaseInfo');
-    $property->setAccessible(TRUE);
     $info = $property->getValue();
     $info['extra']['default']['database'] = 'foobar';
     $property->setValue(NULL, $info);
diff --git a/core/modules/mysql/tests/src/Kernel/mysql/SchemaTest.php b/core/modules/mysql/tests/src/Kernel/mysql/SchemaTest.php
index f219b373280d5da0a30c0deb2d77ae93c6913414..7e373f2aae1c45786f267cac7e3585c60e3336f1 100644
--- a/core/modules/mysql/tests/src/Kernel/mysql/SchemaTest.php
+++ b/core/modules/mysql/tests/src/Kernel/mysql/SchemaTest.php
@@ -240,7 +240,6 @@ public function testIntrospectIndexSchema(): void {
     unset($table_specification['fields']);
 
     $introspect_index_schema = new \ReflectionMethod(get_class($this->schema), 'introspectIndexSchema');
-    $introspect_index_schema->setAccessible(TRUE);
     $index_schema = $introspect_index_schema->invoke($this->schema, $table_name);
 
     $this->assertEquals($table_specification, $index_schema);
diff --git a/core/modules/node/tests/src/Unit/Plugin/views/field/NodeBulkFormTest.php b/core/modules/node/tests/src/Unit/Plugin/views/field/NodeBulkFormTest.php
index 4f3f98b571c78e71834e9bcea66775a3cea32b65..044e4340b41b08391dec3bfc8d04466ddc9f17c0 100644
--- a/core/modules/node/tests/src/Unit/Plugin/views/field/NodeBulkFormTest.php
+++ b/core/modules/node/tests/src/Unit/Plugin/views/field/NodeBulkFormTest.php
@@ -94,7 +94,6 @@ public function testConstructor() {
     $node_bulk_form->init($executable, $display, $options);
 
     $reflected_actions = (new \ReflectionObject($node_bulk_form))->getProperty('actions');
-    $reflected_actions->setAccessible(TRUE);
     $this->assertEquals(array_slice($actions, 0, -1, TRUE), $reflected_actions->getValue($node_bulk_form));
   }
 
diff --git a/core/modules/pgsql/tests/src/Kernel/pgsql/SchemaTest.php b/core/modules/pgsql/tests/src/Kernel/pgsql/SchemaTest.php
index b7fee8694a838f1c19ccb3bf975cf14cae6ec2ef..19158e1131726f3ce45efae5399754378a17b5b7 100644
--- a/core/modules/pgsql/tests/src/Kernel/pgsql/SchemaTest.php
+++ b/core/modules/pgsql/tests/src/Kernel/pgsql/SchemaTest.php
@@ -107,13 +107,11 @@ public function testIntrospectIndexSchema(): void {
     unset($table_specification['fields']);
 
     $introspect_index_schema = new \ReflectionMethod(get_class($this->schema), 'introspectIndexSchema');
-    $introspect_index_schema->setAccessible(TRUE);
     $index_schema = $introspect_index_schema->invoke($this->schema, $table_name);
 
     // The PostgreSQL driver is using a custom naming scheme for its indexes, so
     // we need to adjust the initial table specification.
     $ensure_identifier_length = new \ReflectionMethod(get_class($this->schema), 'ensureIdentifiersLength');
-    $ensure_identifier_length->setAccessible(TRUE);
 
     foreach ($table_specification['unique keys'] as $original_index_name => $columns) {
       unset($table_specification['unique keys'][$original_index_name]);
diff --git a/core/modules/rest/tests/src/Unit/EntityResourceValidationTraitTest.php b/core/modules/rest/tests/src/Unit/EntityResourceValidationTraitTest.php
index 99bd36db1ea7bf7e8919785379678442a3c84e5e..83630dbeb84c8647d924b89eaae16c6ad99f00de 100644
--- a/core/modules/rest/tests/src/Unit/EntityResourceValidationTraitTest.php
+++ b/core/modules/rest/tests/src/Unit/EntityResourceValidationTraitTest.php
@@ -23,7 +23,6 @@ public function testValidate() {
     $trait = new EntityResourceValidationTraitTestClass();
 
     $method = new \ReflectionMethod($trait, 'validate');
-    $method->setAccessible(TRUE);
 
     $violations = $this->prophesize(EntityConstraintViolationList::class);
     $violations->filterByFieldAccess()->shouldBeCalled()->willReturn([]);
@@ -63,7 +62,6 @@ public function testFailedValidate() {
     $trait = new EntityResourceValidationTraitTestClass();
 
     $method = new \ReflectionMethod($trait, 'validate');
-    $method->setAccessible(TRUE);
 
     $this->expectException(UnprocessableEntityHttpException::class);
 
diff --git a/core/modules/sqlite/tests/src/Kernel/sqlite/SchemaTest.php b/core/modules/sqlite/tests/src/Kernel/sqlite/SchemaTest.php
index a3aec37553fd51866dbca285a4fe06e9088a3e4c..4d32f0abbca38d0fb55c290a27c75a2851252500 100644
--- a/core/modules/sqlite/tests/src/Kernel/sqlite/SchemaTest.php
+++ b/core/modules/sqlite/tests/src/Kernel/sqlite/SchemaTest.php
@@ -94,7 +94,6 @@ public function testIntrospectIndexSchema(): void {
     unset($table_specification['fields']);
 
     $introspect_index_schema = new \ReflectionMethod(get_class($this->schema), 'introspectIndexSchema');
-    $introspect_index_schema->setAccessible(TRUE);
     $index_schema = $introspect_index_schema->invoke($this->schema, $table_name);
 
     $this->assertEquals($table_specification, $index_schema);
diff --git a/core/modules/system/tests/src/Kernel/Common/SystemListingTest.php b/core/modules/system/tests/src/Kernel/Common/SystemListingTest.php
index 102247ee3ccda15f84dd6d9796fff82830bdf594..b48da4ed26a395501c7b0c693cec440f6f7c7dc6 100644
--- a/core/modules/system/tests/src/Kernel/Common/SystemListingTest.php
+++ b/core/modules/system/tests/src/Kernel/Common/SystemListingTest.php
@@ -62,7 +62,6 @@ public function testFileScanIgnoreDirectory() {
     // Reset the static to force a re-scan of the directories.
     $reflected_class = new \ReflectionClass(ExtensionDiscovery::class);
     $reflected_property = $reflected_class->getProperty('files');
-    $reflected_property->setAccessible(TRUE);
     $reflected_property->setValue($reflected_class, []);
 
     $this->setSetting('file_scan_ignore_directories', ['drupal_system_listing_compatible_test']);
diff --git a/core/modules/system/tests/src/Kernel/Installer/InstallTranslationFilePatternTest.php b/core/modules/system/tests/src/Kernel/Installer/InstallTranslationFilePatternTest.php
index 4ebf17e8723c05eef75ac63619af216d500a8d8d..3942882d40f350bba0907173e1cc08a1fc2765a2 100644
--- a/core/modules/system/tests/src/Kernel/Installer/InstallTranslationFilePatternTest.php
+++ b/core/modules/system/tests/src/Kernel/Installer/InstallTranslationFilePatternTest.php
@@ -34,7 +34,6 @@ protected function setUp(): void {
     parent::setUp();
     $this->fileTranslation = new FileTranslation('filename', $this->container->get('file_system'));
     $method = new \ReflectionMethod('\Drupal\Core\StringTranslation\Translator\FileTranslation', 'getTranslationFilesPattern');
-    $method->setAccessible(TRUE);
     $this->filePatternMethod = $method;
   }
 
diff --git a/core/modules/system/tests/src/Kernel/System/CronQueueTest.php b/core/modules/system/tests/src/Kernel/System/CronQueueTest.php
index 4e2f1e7858cb0d20348369cb04872e26eb638fd6..abedf8b4b57af2b55eff8b89f46a132665932b8b 100644
--- a/core/modules/system/tests/src/Kernel/System/CronQueueTest.php
+++ b/core/modules/system/tests/src/Kernel/System/CronQueueTest.php
@@ -133,7 +133,6 @@ public function testDelayException() {
     // Ensure that the memory queue expiry time is unchanged after the
     // DelayedRequeueException has been thrown.
     $property = (new \ReflectionClass($memory))->getProperty('queue');
-    $property->setAccessible(TRUE);
     $memory_queue_internal = $property->getValue($memory);
     $this->assertEquals($this->currentTime + $memory_lease_time, reset($memory_queue_internal)->expire);
   }
diff --git a/core/modules/user/tests/src/Unit/Plugin/views/field/UserBulkFormTest.php b/core/modules/user/tests/src/Unit/Plugin/views/field/UserBulkFormTest.php
index c530ad7966ad52a80fdb140e0c3796af0be0e116..97c9bfc4c5b84499b7183d89e017642cfc86d053 100644
--- a/core/modules/user/tests/src/Unit/Plugin/views/field/UserBulkFormTest.php
+++ b/core/modules/user/tests/src/Unit/Plugin/views/field/UserBulkFormTest.php
@@ -94,7 +94,6 @@ public function testConstructor() {
     $user_bulk_form->init($executable, $display, $options);
 
     $reflected_actions = (new \ReflectionObject($user_bulk_form))->getProperty('actions');
-    $reflected_actions->setAccessible(TRUE);
     $this->assertEquals(array_slice($actions, 0, -1, TRUE), $reflected_actions->getValue($user_bulk_form));
   }
 
diff --git a/core/modules/views/tests/src/Kernel/ViewExecutableTest.php b/core/modules/views/tests/src/Kernel/ViewExecutableTest.php
index 2a5e816ba1acad0c3a965491f70ea3fa81ff2398..f44cdc15a0d0a8848976a5fe0b62a648c6a9e93f 100644
--- a/core/modules/views/tests/src/Kernel/ViewExecutableTest.php
+++ b/core/modules/views/tests/src/Kernel/ViewExecutableTest.php
@@ -395,7 +395,6 @@ protected function assertViewDestroy(ViewExecutable $view): void {
    */
   protected function getProtectedProperty($instance, $property) {
     $reflection = new \ReflectionProperty($instance, $property);
-    $reflection->setAccessible(TRUE);
     return $reflection->getValue($instance);
   }
 
diff --git a/core/modules/views/tests/src/Kernel/ViewStorageTest.php b/core/modules/views/tests/src/Kernel/ViewStorageTest.php
index dfb6787642eaf05c3b7579e90bd0b41348f7c9a7..ce2726a60d2d23a2050781ee42a2cadc16b86ec3 100644
--- a/core/modules/views/tests/src/Kernel/ViewStorageTest.php
+++ b/core/modules/views/tests/src/Kernel/ViewStorageTest.php
@@ -237,7 +237,6 @@ protected function displayMethodTests() {
     // it.
     $view = $this->controller->create([]);
     $ref_generate_display_id = new \ReflectionMethod($view, 'generateDisplayId');
-    $ref_generate_display_id->setAccessible(TRUE);
     $this->assertEquals('default', $ref_generate_display_id->invoke($view, 'default'), 'The plugin ID for default is always default.');
     $this->assertEquals('feed_1', $ref_generate_display_id->invoke($view, 'feed'), 'The generated ID for the first instance of a plugin type should have an suffix of _1.');
     $view->addDisplay('feed', 'feed title');
diff --git a/core/modules/views/tests/src/Unit/Controller/ViewAjaxControllerTest.php b/core/modules/views/tests/src/Unit/Controller/ViewAjaxControllerTest.php
index 1d07ee94f38c6aabaf758c83eb68f266638cf03a..b20448c26cfc1c0e000c5f56d8c0ac822ce63d0e 100644
--- a/core/modules/views/tests/src/Unit/Controller/ViewAjaxControllerTest.php
+++ b/core/modules/views/tests/src/Unit/Controller/ViewAjaxControllerTest.php
@@ -428,7 +428,6 @@ protected function setupValidMocks($use_ajax = self::USE_AJAX) {
    */
   protected function getCommands(ViewAjaxResponse $response) {
     $reflection_property = new \ReflectionProperty('Drupal\views\Ajax\ViewAjaxResponse', 'commands');
-    $reflection_property->setAccessible(TRUE);
     $commands = $reflection_property->getValue($response);
     return $commands;
   }
diff --git a/core/modules/views/tests/src/Unit/ViewsHandlerManagerTest.php b/core/modules/views/tests/src/Unit/ViewsHandlerManagerTest.php
index d3c803b3e6f6c7ab5e0a04c4c60163d4f21dcc36..70aeecb98e3fa5f6cec22cbd867eee557b76d363 100644
--- a/core/modules/views/tests/src/Unit/ViewsHandlerManagerTest.php
+++ b/core/modules/views/tests/src/Unit/ViewsHandlerManagerTest.php
@@ -59,7 +59,6 @@ protected function setupMockedFactory() {
 
     $reflection = new \ReflectionClass($this->handlerManager);
     $property = $reflection->getProperty('factory');
-    $property->setAccessible(TRUE);
     $property->setValue($this->handlerManager, $this->factory);
   }
 
diff --git a/core/tests/Drupal/BuildTests/Framework/Tests/BuildTestTest.php b/core/tests/Drupal/BuildTests/Framework/Tests/BuildTestTest.php
index 29388641174e757a293572a373080ccb65c55acc..5945dfb14cdbebd8604dc60e873850998760e23b 100644
--- a/core/tests/Drupal/BuildTests/Framework/Tests/BuildTestTest.php
+++ b/core/tests/Drupal/BuildTests/Framework/Tests/BuildTestTest.php
@@ -163,7 +163,6 @@ public function testStandUpServer() {
 
     // Get the process object for the server.
     $ref_process = new \ReflectionProperty(parent::class, 'serverProcess');
-    $ref_process->setAccessible(TRUE);
     $first_process = $ref_process->getValue($this);
 
     // Standing up the server again should not change the server process.
diff --git a/core/tests/Drupal/KernelTests/Core/Database/DriverSpecificConnectionUnitTestBase.php b/core/tests/Drupal/KernelTests/Core/Database/DriverSpecificConnectionUnitTestBase.php
index cc50302612025a14a528b09d96bf855d924db7d3..488979176179c534ab2485f059f22e5bac0fc7e1 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/DriverSpecificConnectionUnitTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/DriverSpecificConnectionUnitTestBase.php
@@ -179,7 +179,6 @@ public function testOpenSelectQueryClose(): void {
   public function testConnectionOpen() {
     $reflection = new \ReflectionObject($this->connection);
     $connection_property = $reflection->getProperty('connection');
-    $connection_property->setAccessible(TRUE);
     $error_mode = $connection_property->getValue($this->connection)
       ->getAttribute(\PDO::ATTR_ERRMODE);
     // Ensure the default error mode is set to exception.
@@ -192,7 +191,6 @@ public function testConnectionOpen() {
 
     $reflection = new \ReflectionObject($test_connection);
     $connection_property = $reflection->getProperty('connection');
-    $connection_property->setAccessible(TRUE);
     $error_mode = $connection_property->getValue($test_connection)
       ->getAttribute(\PDO::ATTR_ERRMODE);
     // Ensure PDO connection options can be overridden.
diff --git a/core/tests/Drupal/KernelTests/Core/Database/DriverSpecificSchemaTestBase.php b/core/tests/Drupal/KernelTests/Core/Database/DriverSpecificSchemaTestBase.php
index 342ed0ec3a7b9de6a08eca5291e30a1a2ae0c53f..96933c2333494818f10903697a38d7413413a36b 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/DriverSpecificSchemaTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/DriverSpecificSchemaTestBase.php
@@ -254,7 +254,6 @@ public function testSchema(): void {
 
     // Test the primary key columns.
     $method = new \ReflectionMethod(get_class($this->schema), 'findPrimaryKeyColumns');
-    $method->setAccessible(TRUE);
     $this->assertSame(['test_serial'], $method->invoke($this->schema, 'test_table'));
 
     $this->assertTrue($this->tryInsert(), 'Insert with a serial succeeded.');
@@ -579,7 +578,6 @@ protected function assertFieldCharacteristics(string $table_name, string $field_
    */
   public function testSchemaChangePrimaryKey(array $initial_primary_key, array $renamed_primary_key): void {
     $find_primary_key_columns = new \ReflectionMethod(get_class($this->schema), 'findPrimaryKeyColumns');
-    $find_primary_key_columns->setAccessible(TRUE);
 
     // Test making the field the primary key of the table upon creation.
     $table_name = 'test_table';
@@ -892,7 +890,6 @@ protected function assertFieldChange(array $old_spec, array $new_spec, $test_dat
    */
   public function testFindPrimaryKeyColumns(): void {
     $method = new \ReflectionMethod(get_class($this->schema), 'findPrimaryKeyColumns');
-    $method->setAccessible(TRUE);
 
     // Test with single column primary key.
     $this->schema->createTable('table_with_pk_0', [
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityCloneTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityCloneTest.php
index 252fdf76e304222ba47fe5f176c204e872e7bf35..d1a0520b27125b3e16cdb31d74fb76a2368e03fb 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityCloneTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityCloneTest.php
@@ -302,7 +302,6 @@ public function testEntityPropertiesModifications() {
     foreach ($properties as $property) {
       // Modify each entity property on the clone and assert that the change is
       // not propagated to the original entity.
-      $property->setAccessible(TRUE);
       $property->setValue($entity, 'default-value');
       $property->setValue($translation, 'default-value');
       $property->setValue($clone, 'test-entity-cloning');
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityRevisionTranslationTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityRevisionTranslationTest.php
index c67bb05482f28e9c62cd3163eb4659ade848cd42..d3a5a5ccf8a022becf2b652764a2dd0404547619 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityRevisionTranslationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityRevisionTranslationTest.php
@@ -202,7 +202,6 @@ public function testIsAnyStoredRevisionTranslated() {
     /** @var \Drupal\Core\Entity\ContentEntityStorageInterface $storage */
     $storage = $this->entityTypeManager->getStorage('entity_test_mul');
     $method = new \ReflectionMethod(get_class($storage), 'isAnyStoredRevisionTranslated');
-    $method->setAccessible(TRUE);
 
     // Check that a non-revisionable new entity is handled correctly.
     $entity = EntityTestMul::create();
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntitySchemaTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntitySchemaTest.php
index 4978abe42e2473b481d23c98f448ce8d8dda2b57..aa7392067ffe98b154fca4dd28da8fed1073dd28 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntitySchemaTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntitySchemaTest.php
@@ -258,7 +258,6 @@ protected function findPrimaryKeys(EntityTypeInterface $entity_type) {
 
     $schema = $this->database->schema();
     $find_primary_key_columns = new \ReflectionMethod(get_class($schema), 'findPrimaryKeyColumns');
-    $find_primary_key_columns->setAccessible(TRUE);
 
     // Build up a map of primary keys depending on the entity type
     // configuration. If the field that is being removed is part of a table's
diff --git a/core/tests/Drupal/KernelTests/Core/Installer/InstallerRedirectTraitTest.php b/core/tests/Drupal/KernelTests/Core/Installer/InstallerRedirectTraitTest.php
index 44ebd36187166b1e9275236eb1102b0e1755f1c8..42ba0a82d0548b3c770c789c618ae216829ba3d8 100644
--- a/core/tests/Drupal/KernelTests/Core/Installer/InstallerRedirectTraitTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Installer/InstallerRedirectTraitTest.php
@@ -83,12 +83,10 @@ public function testShouldRedirectToInstaller($expected, $exception, $connection
 
       // Un-protect the method using reflection.
       $method_ref = new \ReflectionMethod($trait, 'shouldRedirectToInstaller');
-      $method_ref->setAccessible(TRUE);
 
       // Mock the database connection info.
       $db = $this->getMockForAbstractClass(Database::class);
       $property_ref = new \ReflectionProperty($db, 'databaseInfo');
-      $property_ref->setAccessible(TRUE);
       $property_ref->setValue($db, ['default' => $connection_info]);
 
       if ($connection) {
diff --git a/core/tests/Drupal/KernelTests/Core/Test/EnvironmentCleanerTest.php b/core/tests/Drupal/KernelTests/Core/Test/EnvironmentCleanerTest.php
index 70e31657387d15614f7adbb70fb16b71e59ffe85..2639ba4f06c69b07f2e5a7b297b2197423fc2558 100644
--- a/core/tests/Drupal/KernelTests/Core/Test/EnvironmentCleanerTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Test/EnvironmentCleanerTest.php
@@ -42,7 +42,6 @@ public function testDoCleanTemporaryDirectories() {
     );
 
     $do_cleanup_ref = new \ReflectionMethod($cleaner, 'doCleanTemporaryDirectories');
-    $do_cleanup_ref->setAccessible(TRUE);
 
     $this->assertFileExists(vfsStream::url('cleanup_test/sites/simpletest/delete_dir/delete.me'));
     $this->assertFileExists(vfsStream::url('cleanup_test/sites/simpletest/delete_me.too'));
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/TwigEnvironmentTest.php b/core/tests/Drupal/KernelTests/Core/Theme/TwigEnvironmentTest.php
index 6257dc07cfa7958590d65f3b506451126ed2e84a..74d6c47242566e55a29ab1475481492e50abd486 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/TwigEnvironmentTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/TwigEnvironmentTest.php
@@ -223,7 +223,6 @@ public function testTemplateInvalidation() {
     // on a real site where you reload the page.
     $reflection = new \ReflectionClass(Environment::class);
     $property_reflection = $reflection->getProperty('templateClassPrefix');
-    $property_reflection->setAccessible(TRUE);
     $property_reflection->setValue($environment, 'otherPrefix');
 
     $output = $environment->load(basename($tempfile))->render();
diff --git a/core/tests/Drupal/Tests/Component/Annotation/AnnotatedClassDiscoveryCachedTest.php b/core/tests/Drupal/Tests/Component/Annotation/AnnotatedClassDiscoveryCachedTest.php
index 17c4202c6fc51505433846d7246d5e1d286f03a6..899295cbeb3eea37f3476a6bd193e5e63e8dbf8f 100644
--- a/core/tests/Drupal/Tests/Component/Annotation/AnnotatedClassDiscoveryCachedTest.php
+++ b/core/tests/Drupal/Tests/Component/Annotation/AnnotatedClassDiscoveryCachedTest.php
@@ -46,7 +46,6 @@ public function testGetDefinitions() {
 
     // Gain access to the file cache so we can change it.
     $ref_file_cache = new \ReflectionProperty($discovery, 'fileCache');
-    $ref_file_cache->setAccessible(TRUE);
     /** @var \Drupal\Component\FileCache\FileCacheInterface $file_cache */
     $file_cache = $ref_file_cache->getValue($discovery);
     // The file cache is keyed by the file path, and we'll add some known
diff --git a/core/tests/Drupal/Tests/Component/Annotation/AnnotatedClassDiscoveryTest.php b/core/tests/Drupal/Tests/Component/Annotation/AnnotatedClassDiscoveryTest.php
index 077d51c295fbcebc9d5ed1ed0f0333678786accb..ceada7a5a969a647eccecb09789ee6767689804c 100644
--- a/core/tests/Drupal/Tests/Component/Annotation/AnnotatedClassDiscoveryTest.php
+++ b/core/tests/Drupal/Tests/Component/Annotation/AnnotatedClassDiscoveryTest.php
@@ -33,8 +33,6 @@ public function testGetPluginNamespaces() {
     $discovery = new AnnotatedClassDiscovery(['com/example' => [__DIR__]]);
 
     $reflection = new \ReflectionMethod($discovery, 'getPluginNamespaces');
-    $reflection->setAccessible(TRUE);
-
     $result = $reflection->invoke($discovery);
     $this->assertEquals(['com/example' => [__DIR__]], $result);
   }
diff --git a/core/tests/Drupal/Tests/Component/Plugin/Context/ContextTest.php b/core/tests/Drupal/Tests/Component/Plugin/Context/ContextTest.php
index f9656cfc5e00c383c30f1bedb9fd6c0ed649e2c8..5a653b49005a361862c27580c567925f541c1721 100644
--- a/core/tests/Drupal/Tests/Component/Plugin/Context/ContextTest.php
+++ b/core/tests/Drupal/Tests/Component/Plugin/Context/ContextTest.php
@@ -38,7 +38,6 @@ public function testGetContextValue($expected, $context_value, $is_required, $da
     if ($context_value) {
       // Set visibility of contextValue.
       $ref_context_value = new \ReflectionProperty($mock_context, 'contextValue');
-      $ref_context_value->setAccessible(TRUE);
       // Set contextValue to a testable state.
       $ref_context_value->setValue($mock_context, $context_value);
       // Exercise getContextValue().
diff --git a/core/tests/Drupal/Tests/Component/Plugin/Discovery/DiscoveryCachedTraitTest.php b/core/tests/Drupal/Tests/Component/Plugin/Discovery/DiscoveryCachedTraitTest.php
index 2ed15bbfe29bb14d8014f129cef79224ec7485e9..7895ecddcf353936b5476afcaede0565f161c567 100644
--- a/core/tests/Drupal/Tests/Component/Plugin/Discovery/DiscoveryCachedTraitTest.php
+++ b/core/tests/Drupal/Tests/Component/Plugin/Discovery/DiscoveryCachedTraitTest.php
@@ -36,7 +36,6 @@ public function testGetDefinition($expected, $cached_definitions, $get_definitio
     // Mock a DiscoveryCachedTrait.
     $trait = $this->getMockForTrait('Drupal\Component\Plugin\Discovery\DiscoveryCachedTrait');
     $reflection_definitions = new \ReflectionProperty($trait, 'definitions');
-    $reflection_definitions->setAccessible(TRUE);
     // getDefinition() needs the ::$definitions property to be set in one of two
     // ways: 1) As existing cached data, or 2) as a side-effect of calling
     // getDefinitions().
diff --git a/core/tests/Drupal/Tests/Component/Plugin/Discovery/DiscoveryTraitTest.php b/core/tests/Drupal/Tests/Component/Plugin/Discovery/DiscoveryTraitTest.php
index 4668eda810a1fb15eb59bcb327c33a50134f0c54..d3a07965520464ca78021eaea4c4da83b25a1191 100644
--- a/core/tests/Drupal/Tests/Component/Plugin/Discovery/DiscoveryTraitTest.php
+++ b/core/tests/Drupal/Tests/Component/Plugin/Discovery/DiscoveryTraitTest.php
@@ -35,7 +35,6 @@ public function testDoGetDefinition($expected, $definitions, $plugin_id) {
     $trait = $this->getMockForTrait('Drupal\Component\Plugin\Discovery\DiscoveryTrait');
     // Un-protect the method using reflection.
     $method_ref = new \ReflectionMethod($trait, 'doGetDefinition');
-    $method_ref->setAccessible(TRUE);
     // Call doGetDefinition, with $exception_on_invalid always FALSE.
     $this->assertSame(
       $expected,
@@ -67,7 +66,6 @@ public function testDoGetDefinitionException($expected, $definitions, $plugin_id
     $trait = $this->getMockForTrait('Drupal\Component\Plugin\Discovery\DiscoveryTrait');
     // Un-protect the method using reflection.
     $method_ref = new \ReflectionMethod($trait, 'doGetDefinition');
-    $method_ref->setAccessible(TRUE);
     // Call doGetDefinition, with $exception_on_invalid always TRUE.
     $this->expectException(PluginNotFoundException::class);
     $method_ref->invoke($trait, $definitions, $plugin_id, TRUE);
diff --git a/core/tests/Drupal/Tests/Component/Plugin/Discovery/StaticDiscoveryDecoratorTest.php b/core/tests/Drupal/Tests/Component/Plugin/Discovery/StaticDiscoveryDecoratorTest.php
index 3f4f7124441a95a738232bf0351ecf9a94324ef3..518eaddc1d3b95590090f431d4d13c4c89a5b85d 100644
--- a/core/tests/Drupal/Tests/Component/Plugin/Discovery/StaticDiscoveryDecoratorTest.php
+++ b/core/tests/Drupal/Tests/Component/Plugin/Discovery/StaticDiscoveryDecoratorTest.php
@@ -67,7 +67,6 @@ public function testGetDefinition($expected, $has_register_definitions, $excepti
 
     // Set up the ::$registerDefinitions property.
     $ref_register_definitions = new \ReflectionProperty($mock_decorator, 'registerDefinitions');
-    $ref_register_definitions->setAccessible(TRUE);
     if ($has_register_definitions) {
       // Set the callback object on the mocked decorator.
       $ref_register_definitions->setValue(
@@ -82,7 +81,6 @@ public function testGetDefinition($expected, $has_register_definitions, $excepti
 
     // Set up ::$definitions to an empty array.
     $ref_definitions = new \ReflectionProperty($mock_decorator, 'definitions');
-    $ref_definitions->setAccessible(TRUE);
     $ref_definitions->setValue($mock_decorator, []);
 
     // Mock a decorated object.
@@ -96,7 +94,6 @@ public function testGetDefinition($expected, $has_register_definitions, $excepti
 
     // Set up ::$decorated to our mocked decorated object.
     $ref_decorated = new \ReflectionProperty($mock_decorator, 'decorated');
-    $ref_decorated->setAccessible(TRUE);
     $ref_decorated->setValue($mock_decorator, $mock_decorated);
 
     if ($exception_on_invalid) {
@@ -137,7 +134,6 @@ public function testGetDefinitions($has_register_definitions, $definitions) {
 
     // Set up the ::$registerDefinitions property.
     $ref_register_definitions = new \ReflectionProperty($mock_decorator, 'registerDefinitions');
-    $ref_register_definitions->setAccessible(TRUE);
     if ($has_register_definitions) {
       // Set the callback object on the mocked decorator.
       $ref_register_definitions->setValue(
@@ -152,7 +148,6 @@ public function testGetDefinitions($has_register_definitions, $definitions) {
 
     // Set up ::$definitions to an empty array.
     $ref_definitions = new \ReflectionProperty($mock_decorator, 'definitions');
-    $ref_definitions->setAccessible(TRUE);
     $ref_definitions->setValue($mock_decorator, []);
 
     // Mock a decorated object.
@@ -166,7 +161,6 @@ public function testGetDefinitions($has_register_definitions, $definitions) {
 
     // Set up ::$decorated to our mocked decorated object.
     $ref_decorated = new \ReflectionProperty($mock_decorator, 'decorated');
-    $ref_decorated->setAccessible(TRUE);
     $ref_decorated->setValue($mock_decorator, $mock_decorated);
 
     // Exercise getDefinitions(). It calls parent::getDefinitions() but in this
@@ -216,7 +210,6 @@ function () {
       ->getMock();
     // Poke the decorated object into our decorator.
     $ref_decorated = new \ReflectionProperty($mock_decorator, 'decorated');
-    $ref_decorated->setAccessible(TRUE);
     $ref_decorated->setValue($mock_decorator, $mock_decorated);
 
     // Exercise __call.
diff --git a/core/tests/Drupal/Tests/Component/Plugin/Factory/ReflectionFactoryTest.php b/core/tests/Drupal/Tests/Component/Plugin/Factory/ReflectionFactoryTest.php
index 45d27708fa924dfbda60db63636ea6813b6f0233..0f59ca828d9339701334d2adda692a9e7af10f97 100644
--- a/core/tests/Drupal/Tests/Component/Plugin/Factory/ReflectionFactoryTest.php
+++ b/core/tests/Drupal/Tests/Component/Plugin/Factory/ReflectionFactoryTest.php
@@ -115,7 +115,6 @@ public function testGetInstanceArguments($expected, $reflector_name, $plugin_id,
       ->disableOriginalConstructor()
       ->getMock();
     $get_instance_arguments_ref = new \ReflectionMethod($reflection_factory, 'getInstanceArguments');
-    $get_instance_arguments_ref->setAccessible(TRUE);
 
     // Special case for plugin class without a constructor.
     // getInstanceArguments() throws an exception if there's no constructor.
diff --git a/core/tests/Drupal/Tests/Component/Plugin/PluginManagerBaseTest.php b/core/tests/Drupal/Tests/Component/Plugin/PluginManagerBaseTest.php
index 36b60b68a55398642a6be4fc7f57c141d8d90a2f..11e0a403b6271bca2de6ed44b8f5acf9c2f03467 100644
--- a/core/tests/Drupal/Tests/Component/Plugin/PluginManagerBaseTest.php
+++ b/core/tests/Drupal/Tests/Component/Plugin/PluginManagerBaseTest.php
@@ -56,7 +56,6 @@ public function testCreateInstance() {
     // PluginManagerBase::createInstance() looks for a factory object and then
     // calls createInstance() on it. So we have to mock a factory object.
     $factory_ref = new \ReflectionProperty($manager, 'factory');
-    $factory_ref->setAccessible(TRUE);
     $factory_ref->setValue($manager, $this->getMockFactoryInterface(1));
 
     // Finally the test.
@@ -77,7 +76,6 @@ public function testCreateInstanceFallback() {
     $manager = new StubFallbackPluginManager();
     // Put our stubbed factory on the base object.
     $factory_ref = new \ReflectionProperty($manager, 'factory');
-    $factory_ref->setAccessible(TRUE);
 
     // Set up the configuration array.
     $configuration_array = ['config' => 'something'];
diff --git a/core/tests/Drupal/Tests/Component/Utility/HtmlTest.php b/core/tests/Drupal/Tests/Component/Utility/HtmlTest.php
index 4dc8eea2137c4edb847a6f6e11570e21587abba7..b589e7697140765e070cdc1eddb48d70584e1473 100644
--- a/core/tests/Drupal/Tests/Component/Utility/HtmlTest.php
+++ b/core/tests/Drupal/Tests/Component/Utility/HtmlTest.php
@@ -27,7 +27,6 @@ protected function setUp(): void {
     parent::setUp();
 
     $property = new \ReflectionProperty('Drupal\Component\Utility\Html', 'seenIdsInit');
-    $property->setAccessible(TRUE);
     $property->setValue(NULL);
   }
 
diff --git a/core/tests/Drupal/Tests/Composer/Plugin/VendorHardening/ConfigTest.php b/core/tests/Drupal/Tests/Composer/Plugin/VendorHardening/ConfigTest.php
index 47eedd822c6eaf4365129d37c8a997c054e5aa14..192afb575ed5a27c39cdb49726814137179b47d0 100644
--- a/core/tests/Drupal/Tests/Composer/Plugin/VendorHardening/ConfigTest.php
+++ b/core/tests/Drupal/Tests/Composer/Plugin/VendorHardening/ConfigTest.php
@@ -46,10 +46,8 @@ public function testNoRootMergeConfig() {
     $config = new Config($root);
 
     $ref_default = new \ReflectionProperty($config, 'defaultConfig');
-    $ref_default->setAccessible(TRUE);
 
     $ref_plugin_config = new \ReflectionMethod($config, 'getAllCleanupPaths');
-    $ref_plugin_config->setAccessible(TRUE);
 
     $this->assertEquals(
       $ref_default->getValue($config), $ref_plugin_config->invoke($config)
@@ -76,7 +74,6 @@ public function testRootMergeConfig() {
     $config = new Config($root);
 
     $ref_plugin_config = new \ReflectionMethod($config, 'getAllCleanupPaths');
-    $ref_plugin_config->setAccessible(TRUE);
 
     $plugin_config = $ref_plugin_config->invoke($config);
 
@@ -103,11 +100,9 @@ public function testMixedCaseConfigCleanupPackages() {
     $config = new Config($root);
 
     $ref_plugin_config = new \ReflectionMethod($config, 'getAllCleanupPaths');
-    $ref_plugin_config->setAccessible(TRUE);
 
     // Put some mixed-case in the defaults.
     $ref_default = new \ReflectionProperty($config, 'defaultConfig');
-    $ref_default->setAccessible(TRUE);
     $ref_default->setValue($config, [
       'BeHatted/Mank' => ['tests'],
       'SymFunic/HTTPFoundational' => ['src'],
diff --git a/core/tests/Drupal/Tests/Composer/Plugin/VendorHardening/VendorHardeningPluginTest.php b/core/tests/Drupal/Tests/Composer/Plugin/VendorHardening/VendorHardeningPluginTest.php
index 81b286b986dee2a1c0d921cb682ec3d58006d2b6..30cc3bf10ef9b95aacbbad1d12dab4ebea4df2b4 100644
--- a/core/tests/Drupal/Tests/Composer/Plugin/VendorHardening/VendorHardeningPluginTest.php
+++ b/core/tests/Drupal/Tests/Composer/Plugin/VendorHardening/VendorHardeningPluginTest.php
@@ -58,12 +58,10 @@ public function testCleanPackage() {
       ->willReturn(vfsStream::url('vendor/drupal/package'));
 
     $ref_config = new \ReflectionProperty($plugin, 'config');
-    $ref_config->setAccessible(TRUE);
     $ref_config->setValue($plugin, $config);
 
     $io = $this->prophesize(IOInterface::class);
     $ref_io = new \ReflectionProperty($plugin, 'io');
-    $ref_io->setAccessible(TRUE);
     $ref_io->setValue($plugin, $io->reveal());
 
     $this->assertFileExists(vfsStream::url('vendor/drupal/package/tests/SomeTest.php'));
@@ -89,7 +87,6 @@ public function testCleanPathsForPackage() {
 
     $io = $this->prophesize(IOInterface::class);
     $ref_io = new \ReflectionProperty($plugin, 'io');
-    $ref_io->setAccessible(TRUE);
     $ref_io->setValue($plugin, $io->reveal());
 
     $this->assertFileExists(vfsStream::url('vendor/drupal/package/tests/SomeTest.php'));
@@ -98,7 +95,6 @@ public function testCleanPathsForPackage() {
     $package->getName()->willReturn('drupal/package');
 
     $ref_clean = new \ReflectionMethod($plugin, 'cleanPathsForPackage');
-    $ref_clean->setAccessible(TRUE);
     $ref_clean->invokeArgs($plugin, [$package->reveal(), ['tests']]);
 
     $this->assertFileDoesNotExist(vfsStream::url('vendor/drupal/package/tests'));
@@ -133,11 +129,9 @@ public function testCleanAllPackages() {
 
     $io = $this->prophesize(IOInterface::class);
     $ref_io = new \ReflectionProperty($plugin, 'io');
-    $ref_io->setAccessible(TRUE);
     $ref_io->setValue($plugin, $io->reveal());
 
     $ref_config = new \ReflectionProperty($plugin, 'config');
-    $ref_config->setAccessible(TRUE);
     $ref_config->setValue($plugin, $config);
 
     $this->assertFileExists(vfsStream::url('vendor/drupal/package/tests/SomeTest.php'));
@@ -231,7 +225,6 @@ public function testFindBinOverlap($expected, $binaries, $clean_paths) {
       ->getMock();
 
     $ref_find_bin_overlap = new \ReflectionMethod($plugin, 'findBinOverlap');
-    $ref_find_bin_overlap->setAccessible(TRUE);
 
     $this->assertSame($expected, $ref_find_bin_overlap->invokeArgs($plugin, [$binaries, $clean_paths]));
   }
diff --git a/core/tests/Drupal/Tests/ComposerIntegrationTest.php b/core/tests/Drupal/Tests/ComposerIntegrationTest.php
index ecf7c27a505d61ae0f2e254e88bbe928f358e429..854b495a0f95e4959707e02286436b26b0746c68 100644
--- a/core/tests/Drupal/Tests/ComposerIntegrationTest.php
+++ b/core/tests/Drupal/Tests/ComposerIntegrationTest.php
@@ -260,7 +260,6 @@ public function testVendorCleanup(): void {
     }
 
     $reflection = new \ReflectionProperty(Config::class, 'defaultConfig');
-    $reflection->setAccessible(TRUE);
     $config = $reflection->getValue();
     foreach (array_keys($config) as $package) {
       $this->assertContains(strtolower($package), $packages);
diff --git a/core/tests/Drupal/Tests/Core/Block/BlockManagerTest.php b/core/tests/Drupal/Tests/Core/Block/BlockManagerTest.php
index 8d4d191d009c29911cead3d8dce8149832807a5b..5ce1b499fc3cd389ed57625f89cc0e69a1aa8146 100644
--- a/core/tests/Drupal/Tests/Core/Block/BlockManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Block/BlockManagerTest.php
@@ -79,7 +79,6 @@ protected function setUp(): void {
     ]);
     // Force the discovery object onto the block manager.
     $property = new \ReflectionProperty(BlockManager::class, 'discovery');
-    $property->setAccessible(TRUE);
     $property->setValue($this->blockManager, $discovery->reveal());
   }
 
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php
index 8c97657b934f7c4962fa5156cfc0d186f843f9bf..cc58ccd5e903a68c985833337101011b58d6b40e 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php
@@ -224,7 +224,6 @@ public function testPreSaveDuringSync() {
    */
   public function testAddDependency() {
     $method = new \ReflectionMethod('\Drupal\Core\Config\Entity\ConfigEntityBase', 'addDependency');
-    $method->setAccessible(TRUE);
     $method->invoke($this->entity, 'module', $this->provider);
     $method->invoke($this->entity, 'module', 'core');
     $method->invoke($this->entity, 'module', 'node');
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayBaseTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayBaseTest.php
index 8dd7e77dc76bd8eb5153474c2ea2ef7cc51f0436..ca315415fc3bf785d285d6f6b8dcd5ee37e55097 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayBaseTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayBaseTest.php
@@ -17,7 +17,6 @@ class EntityDisplayBaseTest extends UnitTestCase {
   public function testGetTargetEntityTypeId() {
     $mock = $this->getMockForAbstractClass('\Drupal\Core\Entity\EntityDisplayBase', [], '', FALSE);
     $reflection = new \ReflectionProperty($mock, 'targetEntityType');
-    $reflection->setAccessible(TRUE);
     $reflection->setValue($mock, 'test');
     $this->assertEquals('test', $mock->getTargetEntityTypeId());
   }
@@ -28,7 +27,6 @@ public function testGetTargetEntityTypeId() {
   public function testGetMode() {
     $mock = $this->getMockForAbstractClass('\Drupal\Core\Entity\EntityDisplayBase', [], '', FALSE);
     $reflection = new \ReflectionProperty($mock, 'mode');
-    $reflection->setAccessible(TRUE);
     $reflection->setValue($mock, 'test');
     $this->assertEquals('test', $mock->getMode());
   }
@@ -39,7 +37,6 @@ public function testGetMode() {
   public function testGetOriginalMode() {
     $mock = $this->getMockForAbstractClass('\Drupal\Core\Entity\EntityDisplayBase', [], '', FALSE);
     $reflection = new \ReflectionProperty($mock, 'originalMode');
-    $reflection->setAccessible(TRUE);
     $reflection->setValue($mock, 'test');
     $this->assertEquals('test', $mock->getOriginalMode());
   }
@@ -50,7 +47,6 @@ public function testGetOriginalMode() {
   public function testGetTargetBundle() {
     $mock = $this->getMockForAbstractClass('\Drupal\Core\Entity\EntityDisplayBase', [], '', FALSE);
     $reflection = new \ReflectionProperty($mock, 'bundle');
-    $reflection->setAccessible(TRUE);
     $reflection->setValue($mock, 'test');
     $this->assertEquals('test', $mock->getTargetBundle());
   }
@@ -61,7 +57,6 @@ public function testGetTargetBundle() {
   public function testSetTargetBundle() {
     $mock = $this->getMockForAbstractClass('\Drupal\Core\Entity\EntityDisplayBase', [], '', FALSE);
     $reflection = new \ReflectionProperty($mock, 'bundle');
-    $reflection->setAccessible(TRUE);
     $mock->setTargetBundle('test');
     $this->assertEquals('test', $reflection->getValue($mock));
   }
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayModeBaseUnitTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayModeBaseUnitTest.php
index e7ca0e53f50f6c1392b16cb18ed39692bc82a3fe..c3a9c10b836a45675d8fe1778f7ea7cc3dcd9110 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayModeBaseUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/EntityDisplayModeBaseUnitTest.php
@@ -115,7 +115,6 @@ public function testSetTargetType() {
 
     // Gain access to the protected property.
     $property = new \ReflectionProperty($mock, 'targetEntityType');
-    $property->setAccessible(TRUE);
     // Set the property to a known state.
     $property->setValue($mock, $bad_target);
 
@@ -142,7 +141,6 @@ public function testGetTargetType() {
 
     // Gain access to the protected property.
     $property = new \ReflectionProperty($mock, 'targetEntityType');
-    $property->setAccessible(TRUE);
     // Set the property to a known state.
     $property->setValue($mock, $target);
 
diff --git a/core/tests/Drupal/Tests/Core/Config/Entity/Query/QueryFactoryTest.php b/core/tests/Drupal/Tests/Core/Config/Entity/Query/QueryFactoryTest.php
index 97c6a34c80685f31198a5a56f34bfd71219b9123..e54d3c6959e4ea0f50745d770bfb38c3a2120335 100644
--- a/core/tests/Drupal/Tests/Core/Config/Entity/Query/QueryFactoryTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/Entity/Query/QueryFactoryTest.php
@@ -25,7 +25,6 @@ public function testGetKeys(array $expected, $key, Config $config) {
     $config_entity_type = $this->createMock('Drupal\Core\Config\Entity\ConfigEntityTypeInterface');
     $query_factory = new QueryFactory($config_factory, $key_value_factory, $config_manager);
     $method = new \ReflectionMethod($query_factory, 'getKeys');
-    $method->setAccessible(TRUE);
 
     $actual = $method->invoke($query_factory, $config, $key, 'get', $config_entity_type);
     $this->assertEquals($expected, $actual);
@@ -110,7 +109,6 @@ public function testGetKeysWildCardEnd() {
     $query_factory = new QueryFactory($config_factory, $key_value_factory, $config_manager);
 
     $method = new \ReflectionMethod($query_factory, 'getKeys');
-    $method->setAccessible(TRUE);
     $this->expectException(\LogicException::class);
     $this->expectExceptionMessage('test_config_entity_type lookup key test.* ends with a wildcard this can not be used as a lookup');
     $method->invoke($query_factory, $this->getConfigObject('test'), 'test.*', 'get', $config_entity_type);
diff --git a/core/tests/Drupal/Tests/Core/Config/StorageCopyTraitTest.php b/core/tests/Drupal/Tests/Core/Config/StorageCopyTraitTest.php
index 3b0f780779608bd1f34751e278d28e6a84d52b34..d3710b278df4141d2407d5e77ce8cdb3ad529591 100644
--- a/core/tests/Drupal/Tests/Core/Config/StorageCopyTraitTest.php
+++ b/core/tests/Drupal/Tests/Core/Config/StorageCopyTraitTest.php
@@ -87,7 +87,6 @@ public function providerTestReplaceStorageContents() {
   protected static function toArray(MemoryStorage $storage) {
     $reflection = new \ReflectionObject($storage);
     $property = $reflection->getProperty('config');
-    $property->setAccessible(TRUE);
 
     return $property->getValue($storage)->getArrayCopy();
   }
diff --git a/core/tests/Drupal/Tests/Core/Controller/ControllerBaseTest.php b/core/tests/Drupal/Tests/Core/Controller/ControllerBaseTest.php
index 59b0bbae5b3ee95a36f782fb0f7251fcd7ae3d69..5044789637c59b143309ef05c3524051542dc41d 100644
--- a/core/tests/Drupal/Tests/Core/Controller/ControllerBaseTest.php
+++ b/core/tests/Drupal/Tests/Core/Controller/ControllerBaseTest.php
@@ -48,7 +48,6 @@ public function testGetConfig() {
     \Drupal::setContainer($container);
 
     $config_method = new \ReflectionMethod('Drupal\Core\Controller\ControllerBase', 'config');
-    $config_method->setAccessible(TRUE);
 
     // Call config twice to ensure that the container is just called once.
     $config = $config_method->invoke($this->controllerBase, 'config_name');
diff --git a/core/tests/Drupal/Tests/Core/Database/ConnectionTest.php b/core/tests/Drupal/Tests/Core/Database/ConnectionTest.php
index 45e8f49e4c51bd9b1b6f6c44d3dea787225e03e7..de09bbfed2141898754a91cae32a8fb2a6f371cf 100644
--- a/core/tests/Drupal/Tests/Core/Database/ConnectionTest.php
+++ b/core/tests/Drupal/Tests/Core/Database/ConnectionTest.php
@@ -55,7 +55,6 @@ public function testPrefixRoundTrip($expected, $prefix_info) {
     // setPrefix() is protected, so we make it accessible with reflection.
     $reflection = new \ReflectionClass('Drupal\Tests\Core\Database\Stub\StubConnection');
     $set_prefix = $reflection->getMethod('setPrefix');
-    $set_prefix->setAccessible(TRUE);
 
     // Set the prefix data.
     $set_prefix->invokeArgs($connection, [$prefix_info]);
@@ -423,7 +422,6 @@ public function testFilterComments($expected, $comment) {
     // filterComment() is protected, so we make it accessible with reflection.
     $reflection = new \ReflectionClass('Drupal\Tests\Core\Database\Stub\StubConnection');
     $filter_comment = $reflection->getMethod('filterComment');
-    $filter_comment->setAccessible(TRUE);
 
     $this->assertEquals(
       $expected,
@@ -599,7 +597,6 @@ public function testQueryTrim($expected, $query, $options) {
     $connection = new StubConnection($mock_pdo, []);
 
     $preprocess_method = new \ReflectionMethod($connection, 'preprocessStatement');
-    $preprocess_method->setAccessible(TRUE);
     $this->assertSame($expected, $preprocess_method->invoke($connection, $query, $options));
   }
 
@@ -663,7 +660,7 @@ public function testFindCallerFromDebugBacktrace() {
     $result = $connection->findCallerFromDebugBacktrace();
     $this->assertSame([
       'file' => __FILE__,
-      'line' => 663,
+      'line' => 660,
       'function' => 'testFindCallerFromDebugBacktrace',
       'class' => 'Drupal\Tests\Core\Database\ConnectionTest',
       'type' => '->',
diff --git a/core/tests/Drupal/Tests/Core/Database/SchemaIntrospectionTestTrait.php b/core/tests/Drupal/Tests/Core/Database/SchemaIntrospectionTestTrait.php
index 3591adde959f21bfaa6a53bfb8e700c985e45c19..5e89de4ca572bc84b14af95a6fa0de75dc59cdcd 100644
--- a/core/tests/Drupal/Tests/Core/Database/SchemaIntrospectionTestTrait.php
+++ b/core/tests/Drupal/Tests/Core/Database/SchemaIntrospectionTestTrait.php
@@ -65,7 +65,6 @@ protected function getIndexColumnNames($table_name, $index_type) {
 
     $schema = \Drupal::database()->schema();
     $introspect_index_schema = new \ReflectionMethod(get_class($schema), 'introspectIndexSchema');
-    $introspect_index_schema->setAccessible(TRUE);
     $index_schema = $introspect_index_schema->invoke($schema, $table_name);
 
     // Filter the indexes by type.
diff --git a/core/tests/Drupal/Tests/Core/DrupalKernel/DiscoverServiceProvidersTest.php b/core/tests/Drupal/Tests/Core/DrupalKernel/DiscoverServiceProvidersTest.php
index 08ab3eb906f75975c2979aa03d52acc039fecc81..5a6e6c924ba5d1bea7240c359eb5cd6e372285fd 100644
--- a/core/tests/Drupal/Tests/Core/DrupalKernel/DiscoverServiceProvidersTest.php
+++ b/core/tests/Drupal/Tests/Core/DrupalKernel/DiscoverServiceProvidersTest.php
@@ -29,7 +29,6 @@ public function testDiscoverServiceCustom() {
     $kernel->discoverServiceProviders();
 
     $reflected_yamls = (new \ReflectionObject($kernel))->getProperty('serviceYamls');
-    $reflected_yamls->setAccessible(TRUE);
 
     $expect = [
       'app' => [
@@ -51,7 +50,6 @@ public function testDiscoverServiceNoContainerYamls() {
     $kernel->discoverServiceProviders();
 
     $reflected_yamls = (new \ReflectionObject($kernel))->getProperty('serviceYamls');
-    $reflected_yamls->setAccessible(TRUE);
 
     $expect = [
       'app' => [
diff --git a/core/tests/Drupal/Tests/Core/DrupalKernel/DrupalKernelTest.php b/core/tests/Drupal/Tests/Core/DrupalKernel/DrupalKernelTest.php
index 16b5b0d4757a6ccbda183dae05542b1f5c43ad70..4efda0785bfc33bb289b8fc1e7839cdf91d9d533 100644
--- a/core/tests/Drupal/Tests/Core/DrupalKernel/DrupalKernelTest.php
+++ b/core/tests/Drupal/Tests/Core/DrupalKernel/DrupalKernelTest.php
@@ -38,7 +38,6 @@ public function testTrustedHosts($host, $server_name, $message, $expected = FALS
     $request->server->set('SERVER_NAME', $server_name);
 
     $method = new \ReflectionMethod('Drupal\Core\DrupalKernel', 'setupTrustedHosts');
-    $method->setAccessible(TRUE);
     $valid_host = $method->invoke(NULL, $request, $trusted_host_patterns);
 
     $this->assertSame($expected, $valid_host, $message);
diff --git a/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php b/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php
index acc3bbea081f9f5681ab049c832c17ad764a3d59..5da25e326fb61ea95d26528083c2908100d7e304 100644
--- a/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/ContentEntityBaseUnitTest.php
@@ -573,12 +573,10 @@ public function testGet($expected, $field_name, $active_langcode, $fields) {
 
     // Poke in activeLangcode.
     $ref_langcode = new \ReflectionProperty($mock_base, 'activeLangcode');
-    $ref_langcode->setAccessible(TRUE);
     $ref_langcode->setValue($mock_base, $active_langcode);
 
     // Poke in fields.
     $ref_fields = new \ReflectionProperty($mock_base, 'fields');
-    $ref_fields->setAccessible(TRUE);
     $ref_fields->setValue($mock_base, $fields);
 
     // Exercise get().
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityStorageBaseTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityStorageBaseTest.php
index 065b770a90f5bb7f1127994ddd4d5b07b1868fce..d5bf5f40af7bb24a99362b38b2517bbc570feb86 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityStorageBaseTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityStorageBaseTest.php
@@ -160,7 +160,6 @@ public function testLoadMultiple($expected, $load_multiple, $query) {
       ->willReturn(FALSE);
     // Add the EntityTypeInterface to the storage object.
     $ref_entity_type = new \ReflectionProperty($mock_base, 'entityType');
-    $ref_entity_type->setAccessible(TRUE);
     $ref_entity_type->setValue($mock_base, $mock_entity_type);
 
     // Set up expectations for postLoad(), which we only call if there are
diff --git a/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageTest.php b/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageTest.php
index 749c33cba220cac39c43846811066f6a4a99232a..64a278faa2b0117cba680b96f16f4d3f42a9c39a 100644
--- a/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageTest.php
@@ -1426,7 +1426,6 @@ public function testCleanIds() {
       ->willReturnMap([['id', 'id']]);
 
     $method = new \ReflectionMethod($this->entityStorage, 'cleanIds');
-    $method->setAccessible(TRUE);
     $this->assertEquals($valid_ids, $method->invoke($this->entityStorage, $valid_ids));
 
     $invalid_ids = [
diff --git a/core/tests/Drupal/Tests/Core/Extension/DependencyTest.php b/core/tests/Drupal/Tests/Core/Extension/DependencyTest.php
index ac86b554c37f501efa9f48c72ba6d4403028e88c..865997272a5e74a169c636b996b24f87c32db34f 100644
--- a/core/tests/Drupal/Tests/Core/Extension/DependencyTest.php
+++ b/core/tests/Drupal/Tests/Core/Extension/DependencyTest.php
@@ -53,13 +53,11 @@ public function testSerialization() {
     $dependency = new Dependency('paragraphs_demo', 'paragraphs', '>8.x-1.1');
     $this->assertTrue($dependency->isCompatible('1.2'));
     $reflected_constraint = (new \ReflectionObject($dependency))->getProperty('constraint');
-    $reflected_constraint->setAccessible(TRUE);
     $constraint = $reflected_constraint->getValue($dependency);
     $this->assertInstanceOf(Constraint::class, $constraint);
 
     $dependency = unserialize(serialize($dependency));
     $reflected_constraint = (new \ReflectionObject($dependency))->getProperty('constraint');
-    $reflected_constraint->setAccessible(TRUE);
     $constraint = $reflected_constraint->getValue($dependency);
     $this->assertNull($constraint);
     $this->assertTrue($dependency->isCompatible('1.2'));
diff --git a/core/tests/Drupal/Tests/Core/Extension/ExtensionSerializationTest.php b/core/tests/Drupal/Tests/Core/Extension/ExtensionSerializationTest.php
index df22664e590afb240163bb20230df9dfe4e7f29b..02c7ec19a1e9efc08e22f185b18c9d86c12fac00 100644
--- a/core/tests/Drupal/Tests/Core/Extension/ExtensionSerializationTest.php
+++ b/core/tests/Drupal/Tests/Core/Extension/ExtensionSerializationTest.php
@@ -52,7 +52,6 @@ public function testServiceAppRouteUsage() {
     $extension = new Extension($container->getParameter('app.root'), 'module', 'core/modules/system/system.info.yml', 'system.module');
     $extension = unserialize(serialize($extension));
     $reflected_root = new \ReflectionProperty($extension, 'root');
-    $reflected_root->setAccessible(TRUE);
     $this->assertEquals('vfs://dummy_app_root', $reflected_root->getValue($extension));
 
     // Change the app root and test serializing and unserializing again.
@@ -60,7 +59,6 @@ public function testServiceAppRouteUsage() {
     \Drupal::setContainer($container);
     $extension = unserialize(serialize($extension));
     $reflected_root = new \ReflectionProperty($extension, 'root');
-    $reflected_root->setAccessible(TRUE);
     $this->assertEquals('vfs://dummy_app_root2', $reflected_root->getValue($extension));
   }
 
diff --git a/core/tests/Drupal/Tests/Core/Form/ConfigFormBaseTraitTest.php b/core/tests/Drupal/Tests/Core/Form/ConfigFormBaseTraitTest.php
index 7ef81b9f2a15ea7506f4ee3479636ef1ba90a42b..e2c5554216b3f781087b9f1aefd47042cc5d33c5 100644
--- a/core/tests/Drupal/Tests/Core/Form/ConfigFormBaseTraitTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/ConfigFormBaseTraitTest.php
@@ -28,7 +28,6 @@ public function testConfig() {
       ->willReturn(['editable.config']);
 
     $config_method = new \ReflectionMethod($trait, 'config');
-    $config_method->setAccessible(TRUE);
 
     // Ensure that configuration that is expected to be mutable is.
     $result = $config_method->invoke($trait, 'editable.config');
@@ -46,7 +45,6 @@ public function testConfig() {
   public function testConfigFactoryException() {
     $trait = $this->getMockForTrait('Drupal\Core\Form\ConfigFormBaseTrait');
     $config_method = new \ReflectionMethod($trait, 'config');
-    $config_method->setAccessible(TRUE);
 
     // There is no config factory available this should result in an exception.
     $this->expectException(\LogicException::class);
@@ -60,7 +58,6 @@ public function testConfigFactoryException() {
   public function testConfigFactoryExceptionInvalidProperty() {
     $trait = $this->getMockForTrait('Drupal\Core\Form\ConfigFormBaseTrait');
     $config_method = new \ReflectionMethod($trait, 'config');
-    $config_method->setAccessible(TRUE);
 
     // There is no config factory available this should result in an exception.
     $this->expectException(\LogicException::class);
diff --git a/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php b/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
index ea6ad1899446b176eca625e37adb0fff2d98c7f0..fa6c899e38fed202ed7319d1b39ce3468056e94a 100644
--- a/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
@@ -788,7 +788,6 @@ public function providerTestChildAccessInheritance() {
    */
   public function testValueCallableIsSafe($callback, $expected) {
     $method = new \ReflectionMethod(FormBuilder::class, 'valueCallableIsSafe');
-    $method->setAccessible(TRUE);
     $is_safe = $method->invoke($this->formBuilder, $callback);
     $this->assertSame($expected, $is_safe);
   }
@@ -839,7 +838,6 @@ public function testInvalidToken($expected, $valid_token, $user_is_authenticated
     $current_user = $this->prophesize(AccountInterface::class);
     $current_user->isAuthenticated()->willReturn($user_is_authenticated);
     $property = new \ReflectionProperty(FormBuilder::class, 'currentUser');
-    $property->setAccessible(TRUE);
     $property->setValue($this->formBuilder, $current_user->reveal());
 
     $expected_form = $form_id();
diff --git a/core/tests/Drupal/Tests/Core/Mail/Plugin/Mail/PhpMailTest.php b/core/tests/Drupal/Tests/Core/Mail/Plugin/Mail/PhpMailTest.php
index abc7572b8eb37d745115eb8ae9628dab989d3940..fb4006e6f93a15fbe7849b752a195e8d8a27b12d 100644
--- a/core/tests/Drupal/Tests/Core/Mail/Plugin/Mail/PhpMailTest.php
+++ b/core/tests/Drupal/Tests/Core/Mail/Plugin/Mail/PhpMailTest.php
@@ -90,7 +90,6 @@ protected function createPhpMailInstance(): PhpMail {
 
     $reflection = new \ReflectionClass($mailer);
     $reflection_property = $reflection->getProperty('request');
-    $reflection_property->setAccessible(TRUE);
     $reflection_property->setValue($mailer, $request);
     return $mailer;
   }
diff --git a/core/tests/Drupal/Tests/Core/Menu/ContextualLinkManagerTest.php b/core/tests/Drupal/Tests/Core/Menu/ContextualLinkManagerTest.php
index 6a160314f985b6bb529ce4550e89b07abbb75866..55087bb87b409fecc6ef555cb14ae40c3032e893 100644
--- a/core/tests/Drupal/Tests/Core/Menu/ContextualLinkManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/ContextualLinkManagerTest.php
@@ -94,7 +94,6 @@ protected function setUp(): void {
     );
 
     $property = new \ReflectionProperty('Drupal\Core\Menu\ContextualLinkManager', 'discovery');
-    $property->setAccessible(TRUE);
     $property->setValue($this->contextualLinkManager, $this->pluginDiscovery);
   }
 
diff --git a/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTestBase.php b/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTestBase.php
index ec5a48ed79431632013665117c888066dac5aec9..7639ee7ddb360a137bb89b2acc1903b58c8553bb 100644
--- a/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTestBase.php
+++ b/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTestBase.php
@@ -63,30 +63,25 @@ protected function getLocalTaskManager($module_dirs, $route_name, $route_params)
 
     $argumentResolver = $this->createMock('Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface');
     $property = new \ReflectionProperty('Drupal\Core\Menu\LocalTaskManager', 'argumentResolver');
-    $property->setAccessible(TRUE);
     $property->setValue($manager, $argumentResolver);
 
     // todo mock a request with a route.
     $request_stack = new RequestStack();
     $property = new \ReflectionProperty('Drupal\Core\Menu\LocalTaskManager', 'requestStack');
-    $property->setAccessible(TRUE);
     $property->setValue($manager, $request_stack);
 
     $accessManager = $this->createMock('Drupal\Core\Access\AccessManagerInterface');
     $property = new \ReflectionProperty('Drupal\Core\Menu\LocalTaskManager', 'accessManager');
-    $property->setAccessible(TRUE);
     $property->setValue($manager, $accessManager);
 
     $route_provider = $this->createMock('Drupal\Core\Routing\RouteProviderInterface');
     $property = new \ReflectionProperty('Drupal\Core\Menu\LocalTaskManager', 'routeProvider');
-    $property->setAccessible(TRUE);
     $property->setValue($manager, $route_provider);
 
     $module_handler = $this->getMockBuilder('Drupal\Core\Extension\ModuleHandlerInterface')
       ->disableOriginalConstructor()
       ->getMock();
     $property = new \ReflectionProperty('Drupal\Core\Menu\LocalTaskManager', 'moduleHandler');
-    $property->setAccessible(TRUE);
     $property->setValue($manager, $module_handler);
     // Set all the modules as being existent.
     $module_handler->expects($this->any())
@@ -98,11 +93,9 @@ protected function getLocalTaskManager($module_dirs, $route_name, $route_params)
     $pluginDiscovery = new YamlDiscovery('links.task', $module_dirs);
     $pluginDiscovery = new ContainerDerivativeDiscoveryDecorator($pluginDiscovery);
     $property = new \ReflectionProperty('Drupal\Core\Menu\LocalTaskManager', 'discovery');
-    $property->setAccessible(TRUE);
     $property->setValue($manager, $pluginDiscovery);
 
     $method = new \ReflectionMethod('Drupal\Core\Menu\LocalTaskManager', 'alterInfo');
-    $method->setAccessible(TRUE);
     $method->invoke($manager, 'local_tasks');
 
     $plugin_stub = $this->createMock('Drupal\Core\Menu\LocalTaskInterface');
@@ -111,7 +104,6 @@ protected function getLocalTaskManager($module_dirs, $route_name, $route_params)
       ->method('createInstance')
       ->willReturn($plugin_stub);
     $property = new \ReflectionProperty('Drupal\Core\Menu\LocalTaskManager', 'factory');
-    $property->setAccessible(TRUE);
     $property->setValue($manager, $factory);
 
     $cache_backend = $this->createMock('Drupal\Core\Cache\CacheBackendInterface');
diff --git a/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php b/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php
index faf6850cbebfd01edc54c06fe0872db917da690c..dfb55098a3697023c001e72bf75409d4d7442255 100644
--- a/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/LocalTaskManagerTest.php
@@ -258,11 +258,9 @@ protected function setupLocalTaskManager() {
     $this->manager = new LocalTaskManager($this->argumentResolver, $request_stack, $this->routeMatch, $this->routeProvider, $module_handler, $this->cacheBackend, $language_manager, $this->accessManager, $this->account);
 
     $property = new \ReflectionProperty('Drupal\Core\Menu\LocalTaskManager', 'discovery');
-    $property->setAccessible(TRUE);
     $property->setValue($this->manager, $this->pluginDiscovery);
 
     $property = new \ReflectionProperty('Drupal\Core\Menu\LocalTaskManager', 'factory');
-    $property->setAccessible(TRUE);
     $property->setValue($this->manager, $this->factory);
 
   }
diff --git a/core/tests/Drupal/Tests/Core/Routing/RouterUnsupportedTest.php b/core/tests/Drupal/Tests/Core/Routing/RouterUnsupportedTest.php
index 458654e0e4f49d8ca3f4106a647b339ce950bb4a..222dbb8a1cbb94a8a0af6d061636052698611597 100644
--- a/core/tests/Drupal/Tests/Core/Routing/RouterUnsupportedTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/RouterUnsupportedTest.php
@@ -42,9 +42,7 @@ public function testGenerateUnsupported() {
   public function testDeprecatedAdd() {
     // Test needs access to router's protected properties.
     $filters = new \ReflectionProperty(Router::class, 'filters');
-    $filters->setAccessible(TRUE);
     $enhancers = new \ReflectionProperty(Router::class, 'enhancers');
-    $enhancers->setAccessible(TRUE);
 
     $route_provider = $this->prophesize(RouteProviderInterface::class);
     $current_path_stack = $this->prophesize(CurrentPathStack::class);
diff --git a/core/tests/Drupal/Tests/Core/Site/SettingsTest.php b/core/tests/Drupal/Tests/Core/Site/SettingsTest.php
index 0737c5a81e543e99348691deb0b3c72dc0a36ab4..7090275cca1cb3d4676879cd2c1106f745559229 100644
--- a/core/tests/Drupal/Tests/Core/Site/SettingsTest.php
+++ b/core/tests/Drupal/Tests/Core/Site/SettingsTest.php
@@ -146,7 +146,6 @@ public function testGetInstanceReflection() {
 
     $class = new \ReflectionClass(Settings::class);
     $instance_property = $class->getProperty("instance");
-    $instance_property->setAccessible(TRUE);
     $instance_property->setValue(NULL);
 
     $this->expectException(\BadMethodCallException::class);
@@ -200,7 +199,6 @@ public function testFakeDeprecatedSettings(array $settings_config, string $setti
 
     $class = new \ReflectionClass(Settings::class);
     $instance_property = $class->getProperty('deprecatedSettings');
-    $instance_property->setAccessible(TRUE);
     $deprecated_settings = $instance_property->getValue();
     $deprecated_settings['deprecated_legacy'] = $deprecated_setting;
     $instance_property->setValue($deprecated_settings);
diff --git a/core/tests/Drupal/Tests/Core/StringTranslation/StringTranslationTraitTest.php b/core/tests/Drupal/Tests/Core/StringTranslation/StringTranslationTraitTest.php
index 6e5b813ac02ce0e1729ea301da2513e8c13e0d56..6f693318633f15549221d64352ec8425d4f62560 100644
--- a/core/tests/Drupal/Tests/Core/StringTranslation/StringTranslationTraitTest.php
+++ b/core/tests/Drupal/Tests/Core/StringTranslation/StringTranslationTraitTest.php
@@ -51,7 +51,6 @@ protected function setUp(): void {
    */
   public function testT() {
     $method = $this->reflection->getMethod('t');
-    $method->setAccessible(TRUE);
 
     $result = $method->invoke($this->translation, 'something');
     $this->assertInstanceOf(TranslatableMarkup::class, $result);
@@ -63,7 +62,6 @@ public function testT() {
    */
   public function testFormatPlural() {
     $method = $this->reflection->getMethod('formatPlural');
-    $method->setAccessible(TRUE);
 
     $result = $method->invoke($this->translation, 2, 'apple', 'apples');
     $this->assertInstanceOf(PluralTranslatableMarkup::class, $result);
diff --git a/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php b/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php
index 4df06f7a4c51047aed83a928f288a2edd6b4d173..bffe8fa0a6ce0746de703852e4f325e764f12f2d 100644
--- a/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php
+++ b/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php
@@ -366,7 +366,6 @@ public function testSerialization() {
     $this->assertInstanceOf(SharedTempStore::class, $store);
 
     $reflected_request_stack = (new \ReflectionObject($store))->getProperty('requestStack');
-    $reflected_request_stack->setAccessible(TRUE);
     $request_stack = $reflected_request_stack->getValue($store);
     $this->assertEquals($this->requestStack, $request_stack);
     $this->assertSame($unserializable_request, $request_stack->pop());
diff --git a/core/tests/Drupal/Tests/Core/Test/BrowserTestBaseTest.php b/core/tests/Drupal/Tests/Core/Test/BrowserTestBaseTest.php
index b32a8b396f894768d05b7942c031349141a22e0c..b15b989b595908a68830724b053e8ced98b99d09 100644
--- a/core/tests/Drupal/Tests/Core/Test/BrowserTestBaseTest.php
+++ b/core/tests/Drupal/Tests/Core/Test/BrowserTestBaseTest.php
@@ -53,7 +53,6 @@ public function testGetHttpClient() {
     $btb = $this->mockBrowserTestBaseWithDriver($driver);
 
     $ref_gethttpclient = new \ReflectionMethod($btb, 'getHttpClient');
-    $ref_gethttpclient->setAccessible(TRUE);
 
     $this->assertSame(get_class($expected), get_class($ref_gethttpclient->invoke($btb)));
   }
@@ -67,7 +66,6 @@ public function testGetHttpClientException() {
     $btb = $this->mockBrowserTestBaseWithDriver(new \stdClass());
 
     $ref_gethttpclient = new \ReflectionMethod($btb, 'getHttpClient');
-    $ref_gethttpclient->setAccessible(TRUE);
 
     $this->expectException(\RuntimeException::class);
     $this->expectExceptionMessage('The Mink client type stdClass does not support getHttpClient().');
@@ -88,7 +86,6 @@ public function testTearDownWithoutSetUp() {
       ->getMockForAbstractClass();
     $btb->expects($this->never())->method($method);
     $ref_tearDown = new \ReflectionMethod($btb, 'tearDown');
-    $ref_tearDown->setAccessible(TRUE);
     $ref_tearDown->invoke($btb);
   }
 
diff --git a/core/tests/Drupal/Tests/Core/Test/RunTests/TestFileParserTest.php b/core/tests/Drupal/Tests/Core/Test/RunTests/TestFileParserTest.php
index 43bd98dcd17c2bc69c2520b44ac0ea5d269785de..3d8d388761854453cc2281ca3e3eb3e0ab80acb0 100644
--- a/core/tests/Drupal/Tests/Core/Test/RunTests/TestFileParserTest.php
+++ b/core/tests/Drupal/Tests/Core/Test/RunTests/TestFileParserTest.php
@@ -71,7 +71,6 @@ public function testParseContents($expected, $contents) {
     $parser = new TestFileParser();
 
     $ref_parse = new \ReflectionMethod($parser, 'parseContents');
-    $ref_parse->setAccessible(TRUE);
 
     $this->assertSame($expected, $ref_parse->invoke($parser, $contents));
   }
diff --git a/core/tests/Drupal/Tests/Core/Test/TestSetupTraitTest.php b/core/tests/Drupal/Tests/Core/Test/TestSetupTraitTest.php
index 43dce9fdcc0999d3340e3b9d174fbfd8c4d4cd42..b6ba4e389db9659926bb1653fa75acc6dfd3197a 100644
--- a/core/tests/Drupal/Tests/Core/Test/TestSetupTraitTest.php
+++ b/core/tests/Drupal/Tests/Core/Test/TestSetupTraitTest.php
@@ -41,7 +41,6 @@ public function testChangeDatabasePrefix() {
     $reflection->getProperty('root')->setValue($test_setup, $root);
 
     $method = new \ReflectionMethod(get_class($test_setup), 'changeDatabasePrefix');
-    $method->setAccessible(TRUE);
     $method->invoke($test_setup);
 
     // Ensure that SIMPLETEST_DB defines the default database connection after
diff --git a/core/tests/Drupal/Tests/Core/Test/TestSuiteBaseTest.php b/core/tests/Drupal/Tests/Core/Test/TestSuiteBaseTest.php
index fdcc901511a5d574fdb6dfc939ddc506cb1ecb66..8a82e033c4c78c2274c9edb604f9240c8f12c4a4 100644
--- a/core/tests/Drupal/Tests/Core/Test/TestSuiteBaseTest.php
+++ b/core/tests/Drupal/Tests/Core/Test/TestSuiteBaseTest.php
@@ -93,7 +93,6 @@ public function testAddTestsBySuiteNamespaceCore($filesystem, $suite_namespace,
 
     // Access addTestsBySuiteNamespace().
     $ref_add_tests = new \ReflectionMethod($stub, 'addTestsBySuiteNamespace');
-    $ref_add_tests->setAccessible(TRUE);
 
     // Invoke addTestsBySuiteNamespace().
     $ref_add_tests->invokeArgs($stub, [vfsStream::url('root'), $suite_namespace]);
diff --git a/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php b/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
index a394a12f9ac2b22fe77c8dfa2ca2e23edf98fb14..e532525e1d783cfbf7198f6342133ad0843a7e5b 100644
--- a/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
+++ b/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
@@ -208,7 +208,6 @@ public function testPostProcessExtension($defined_functions, $hooks, $expected)
 
     $class = new \ReflectionClass(Registry::class);
     $reflection_method = $class->getMethod('postProcessExtension');
-    $reflection_method->setAccessible(TRUE);
     $reflection_method->invokeArgs($this->registry, [&$hooks, $theme->reveal()]);
 
     $this->assertEquals($expected, $hooks);