diff --git a/core/modules/action/src/Tests/BulkFormTest.php b/core/modules/action/src/Tests/BulkFormTest.php
index 86c34d0d02782abff918d6301ad31c80af46abf7..8fd634bb777a6f6d34b707b5db938583b613c3fa 100644
--- a/core/modules/action/src/Tests/BulkFormTest.php
+++ b/core/modules/action/src/Tests/BulkFormTest.php
@@ -18,11 +18,6 @@
  */
 class BulkFormTest extends WebTestBase {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to install.
    *
diff --git a/core/modules/block/src/Tests/BlockUiTest.php b/core/modules/block/src/Tests/BlockUiTest.php
index 0313443d9a0c5025743ecc645752aa001a29b8f4..e03135fd0aae25ac53f685096621d4a4eb2d4ed1 100644
--- a/core/modules/block/src/Tests/BlockUiTest.php
+++ b/core/modules/block/src/Tests/BlockUiTest.php
@@ -16,11 +16,6 @@
  */
 class BlockUiTest extends WebTestBase {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to install.
    *
diff --git a/core/modules/block/src/Tests/Views/DisplayBlockTest.php b/core/modules/block/src/Tests/Views/DisplayBlockTest.php
index 012c74ac4a3e6e9c57e66d1ffe4d63ed24776b6f..1fafbe2e377adc309167fbc7f80cfae52249d8cf 100644
--- a/core/modules/block/src/Tests/Views/DisplayBlockTest.php
+++ b/core/modules/block/src/Tests/Views/DisplayBlockTest.php
@@ -22,15 +22,6 @@
  */
 class DisplayBlockTest extends ViewTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to install.
    *
diff --git a/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php b/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php
index c6e3d3f1fd9b6a73aec883a0f4e5e645d5e44c8a..1ea2156da2b88ceb5e6721ecc8ec79989fc04a4c 100644
--- a/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php
+++ b/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php
@@ -18,15 +18,6 @@
  */
 class BlockContentCacheTagsTest extends EntityCacheTagsTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * {@inheritdoc}
    */
diff --git a/core/modules/block_content/src/Tests/BlockContentFieldTest.php b/core/modules/block_content/src/Tests/BlockContentFieldTest.php
index 26d921a0d19724114212e5a415953c6ba2da2faa..4fc7bf651ad7f235d5fd268d9a8f410f505fd240 100644
--- a/core/modules/block_content/src/Tests/BlockContentFieldTest.php
+++ b/core/modules/block_content/src/Tests/BlockContentFieldTest.php
@@ -17,15 +17,6 @@
  */
 class BlockContentFieldTest extends BlockContentTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/block_content/src/Tests/BlockContentTranslationUITest.php b/core/modules/block_content/src/Tests/BlockContentTranslationUITest.php
index 8e3a0e75f231c8c848a231f71d39fe9439d534d8..74fc5375fdf81ea9e26d425d73d014038fb67dd7 100644
--- a/core/modules/block_content/src/Tests/BlockContentTranslationUITest.php
+++ b/core/modules/block_content/src/Tests/BlockContentTranslationUITest.php
@@ -17,16 +17,6 @@
  */
 class BlockContentTranslationUITest extends ContentTranslationUITest {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php b/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php
index 2773509c32d7b6a444cd8117d98aa0e3d09d3d1e..68497577470fc64c18480873eb218ca9e01a4ccf 100644
--- a/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php
+++ b/core/modules/ckeditor/src/Tests/CKEditorAdminTest.php
@@ -18,11 +18,6 @@
  */
 class CKEditorAdminTest extends WebTestBase {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/ckeditor/src/Tests/CKEditorLoadingTest.php b/core/modules/ckeditor/src/Tests/CKEditorLoadingTest.php
index 98d73af750ad44a438307b6de0792f25276dc2b8..cddf23fa1145ec8d98c0aa71f7739d8a16c61346 100644
--- a/core/modules/ckeditor/src/Tests/CKEditorLoadingTest.php
+++ b/core/modules/ckeditor/src/Tests/CKEditorLoadingTest.php
@@ -129,7 +129,7 @@ function testLoading() {
     \Drupal::service('module_installer')->install(array('ckeditor_test'));
     $this->container->get('plugin.manager.ckeditor.plugin')->clearCachedDefinitions();
     $editor_settings = $editor->getSettings();
-    $editor_settings['toolbar']['buttons'][0][] = 'Llama';
+    $editor_settings['toolbar']['rows'][0][0]['items'][] = 'Llama';
     $editor->setSettings($editor_settings);
     $editor->save();
     $this->drupalGet('node/add/article');
diff --git a/core/modules/color/src/Tests/ColorConfigSchemaTest.php b/core/modules/color/src/Tests/ColorConfigSchemaTest.php
index 01f3646e5bba50a0719fa484fc3c19f438a71d05..0a4fb9737bf78405c1a3e0f041e515d8238849f4 100644
--- a/core/modules/color/src/Tests/ColorConfigSchemaTest.php
+++ b/core/modules/color/src/Tests/ColorConfigSchemaTest.php
@@ -16,11 +16,6 @@
  */
 class ColorConfigSchemaTest extends WebTestBase {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to install.
    *
diff --git a/core/modules/color/src/Tests/ColorTest.php b/core/modules/color/src/Tests/ColorTest.php
index 8adc7f26ada6f320e78b1ff12b5e2eae6c409229..185faae5155fb8a484096de9052d3ce66b8670cb 100644
--- a/core/modules/color/src/Tests/ColorTest.php
+++ b/core/modules/color/src/Tests/ColorTest.php
@@ -17,11 +17,6 @@
  */
 class ColorTest extends WebTestBase {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to install.
    *
diff --git a/core/modules/comment/src/Tests/CommentActionsTest.php b/core/modules/comment/src/Tests/CommentActionsTest.php
index e5443c18591d32cab7c2f1db7b7992b16f6ee856..a0b50d6449a67323af3c183a5926856332580001 100644
--- a/core/modules/comment/src/Tests/CommentActionsTest.php
+++ b/core/modules/comment/src/Tests/CommentActionsTest.php
@@ -16,11 +16,6 @@
  */
 class CommentActionsTest extends CommentTestBase {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to install.
    *
diff --git a/core/modules/config/src/Tests/ConfigDependencyTest.php b/core/modules/config/src/Tests/ConfigDependencyTest.php
index e4fcf2facf8e187bdd635fa6e7afa7c27217a3e4..88abef7dfa102d7b90fd3179444fa19f16efffe3 100644
--- a/core/modules/config/src/Tests/ConfigDependencyTest.php
+++ b/core/modules/config/src/Tests/ConfigDependencyTest.php
@@ -16,15 +16,6 @@
  */
 class ConfigDependencyTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/config/src/Tests/ConfigEntityNormalizeTest.php b/core/modules/config/src/Tests/ConfigEntityNormalizeTest.php
index dcc6341627a8c5920862382eb3c756c2874f1ec2..5e52cfe9bf2ce1b04cfc504981cdbc69821a9698 100644
--- a/core/modules/config/src/Tests/ConfigEntityNormalizeTest.php
+++ b/core/modules/config/src/Tests/ConfigEntityNormalizeTest.php
@@ -11,15 +11,6 @@
  */
 class ConfigEntityNormalizeTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   public static $modules = array('config_test');
 
   protected function setUp() {
diff --git a/core/modules/config/src/Tests/ConfigEventsTest.php b/core/modules/config/src/Tests/ConfigEventsTest.php
index a9671287b762d7cce8e25234a79f197da80d5790..b4f72794ad1addc97227598db557d3cea930f69e 100644
--- a/core/modules/config/src/Tests/ConfigEventsTest.php
+++ b/core/modules/config/src/Tests/ConfigEventsTest.php
@@ -18,15 +18,6 @@
  */
 class ConfigEventsTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/config/src/Tests/ConfigImportRenameValidationTest.php b/core/modules/config/src/Tests/ConfigImportRenameValidationTest.php
index a7cae49a6eeccbffa4d73710ddb798ef961fce64..ea2facebd3acef80b01298d60a8b0525ab2ed462 100644
--- a/core/modules/config/src/Tests/ConfigImportRenameValidationTest.php
+++ b/core/modules/config/src/Tests/ConfigImportRenameValidationTest.php
@@ -22,15 +22,6 @@
  */
 class ConfigImportRenameValidationTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Config Importer object used for testing.
    *
diff --git a/core/modules/config/src/Tests/ConfigInstallTest.php b/core/modules/config/src/Tests/ConfigInstallTest.php
index 745950a70ad639b964a8ac19413992b41ce9cb51..01c3bd843fa4626296fb47162e5dfcb24d3e663f 100644
--- a/core/modules/config/src/Tests/ConfigInstallTest.php
+++ b/core/modules/config/src/Tests/ConfigInstallTest.php
@@ -17,15 +17,6 @@
  */
 class ConfigInstallTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   protected function setUp() {
     parent::setUp();
 
diff --git a/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php b/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php
index 2246612384cad4f1e5e8e122f722aaca3d87772e..2371a88a16aab8c8a879782a42b6b79235439efe 100644
--- a/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php
+++ b/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php
@@ -17,15 +17,6 @@
  */
 class ConfigLanguageOverrideTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/config/src/Tests/ConfigOverrideTest.php b/core/modules/config/src/Tests/ConfigOverrideTest.php
index 76c82036141d5cf91738a726dc14d1bbc6aadaf1..38ba0a1e581fc0fad4368988378c40620ec2ba79 100644
--- a/core/modules/config/src/Tests/ConfigOverrideTest.php
+++ b/core/modules/config/src/Tests/ConfigOverrideTest.php
@@ -16,15 +16,6 @@
  */
 class ConfigOverrideTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/config/src/Tests/ConfigSchemaTest.php b/core/modules/config/src/Tests/ConfigSchemaTest.php
index e87a984639d687bd767f16da711f848f922381f1..202b55225830bcdd49e03e79f459afa6472d8097 100644
--- a/core/modules/config/src/Tests/ConfigSchemaTest.php
+++ b/core/modules/config/src/Tests/ConfigSchemaTest.php
@@ -20,15 +20,6 @@
  */
 class ConfigSchemaTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/config/src/Tests/SchemaCheckTraitTest.php b/core/modules/config/src/Tests/SchemaCheckTraitTest.php
index db3be3cc5960fca799bdd8c8e60cab72f998131d..a622db8c22d01552aea119f70aee7284549f1d46 100644
--- a/core/modules/config/src/Tests/SchemaCheckTraitTest.php
+++ b/core/modules/config/src/Tests/SchemaCheckTraitTest.php
@@ -18,15 +18,6 @@
  */
 class SchemaCheckTraitTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   use SchemaCheckTrait;
 
   /**
diff --git a/core/modules/config/src/Tests/SchemaConfigListenerTest.php b/core/modules/config/src/Tests/SchemaConfigListenerTest.php
index 579d916cc528c894d2b5075a915e491fe5de5447..79d9208c8afce89162fd2a564b469fe4d1f224fd 100644
--- a/core/modules/config/src/Tests/SchemaConfigListenerTest.php
+++ b/core/modules/config/src/Tests/SchemaConfigListenerTest.php
@@ -23,11 +23,6 @@ class SchemaConfigListenerTest extends KernelTestBase {
    */
   public static $modules = array('config_test');
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Tests \Drupal\Core\Config\Testing\ConfigSchemaChecker.
    */
diff --git a/core/modules/config/src/Tests/SchemaConfigListenerWebTest.php b/core/modules/config/src/Tests/SchemaConfigListenerWebTest.php
index 878665c14cdbfb9547f5e93df1a55226ff505f75..01a1cf8712bf510a9b48769a72c7e1aed7b12c4b 100644
--- a/core/modules/config/src/Tests/SchemaConfigListenerWebTest.php
+++ b/core/modules/config/src/Tests/SchemaConfigListenerWebTest.php
@@ -24,11 +24,6 @@ class SchemaConfigListenerWebTest extends WebTestBase {
    */
   public static $modules = array('config_test');
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Tests \Drupal\Core\Config\Testing\ConfigSchemaChecker.
    */
diff --git a/core/modules/contact/src/Tests/ContactPersonalTest.php b/core/modules/contact/src/Tests/ContactPersonalTest.php
index 2fbab6e3cc59a984b4e94f70fbaf0d4ce3556ecc..b92ad85e771194fd9b6825d5e36551f92458ff1c 100644
--- a/core/modules/contact/src/Tests/ContactPersonalTest.php
+++ b/core/modules/contact/src/Tests/ContactPersonalTest.php
@@ -18,15 +18,6 @@
  */
 class ContactPersonalTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/contact/src/Tests/ContactSitewideTest.php b/core/modules/contact/src/Tests/ContactSitewideTest.php
index 53d8269b4e50f4549bc1fcacc98350d2435c8eef..b7379ca1bf344cd2223a028bf6fd35b0faa682db 100644
--- a/core/modules/contact/src/Tests/ContactSitewideTest.php
+++ b/core/modules/contact/src/Tests/ContactSitewideTest.php
@@ -23,15 +23,6 @@ class ContactSitewideTest extends WebTestBase {
 
   use FieldUiTestTrait;
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/contact/src/Tests/Views/ContactLinkTest.php b/core/modules/contact/src/Tests/Views/ContactLinkTest.php
index 060d1b810d276e0b7d20ba38978669025eeb5d92..bb7fb91b43ff4e602f6a123d8018523509afaeaf 100644
--- a/core/modules/contact/src/Tests/Views/ContactLinkTest.php
+++ b/core/modules/contact/src/Tests/Views/ContactLinkTest.php
@@ -18,15 +18,6 @@
  */
 class ContactLinkTest extends ViewTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Stores the user data service used by the test.
    *
diff --git a/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php b/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
index 0b2102d4bc01115b00dfc0b04b1f511cdc8a4c54..98a988386d2919effaf8eef78eea815d637687c6 100644
--- a/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
+++ b/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
@@ -21,15 +21,6 @@
  */
 class ContentTranslationSettingsTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/datetime/src/Tests/DateTimeFieldTest.php b/core/modules/datetime/src/Tests/DateTimeFieldTest.php
index 2de16eeac32133875a4e1f61329cb9fec15ab601..aa5239e3b9f0174ad9b2efc3d8654fe98f22906c 100644
--- a/core/modules/datetime/src/Tests/DateTimeFieldTest.php
+++ b/core/modules/datetime/src/Tests/DateTimeFieldTest.php
@@ -19,15 +19,6 @@
  */
 class DateTimeFieldTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/editor/src/Tests/EditorAdminTest.php b/core/modules/editor/src/Tests/EditorAdminTest.php
index 86080273addbd66bbaeb1a111839d5f373360c4f..020aa587b842e9e809d791833cf152005ffa290b 100644
--- a/core/modules/editor/src/Tests/EditorAdminTest.php
+++ b/core/modules/editor/src/Tests/EditorAdminTest.php
@@ -16,11 +16,6 @@
  */
 class EditorAdminTest extends WebTestBase {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/entity_reference/src/Tests/Views/SelectionTest.php b/core/modules/entity_reference/src/Tests/Views/SelectionTest.php
index 1fbe5cb54c70fe726e8f384ca33e8954d766dbfa..823e46ff5b1879fedcd393317351d3496dd9009e 100644
--- a/core/modules/entity_reference/src/Tests/Views/SelectionTest.php
+++ b/core/modules/entity_reference/src/Tests/Views/SelectionTest.php
@@ -16,15 +16,6 @@
  */
 class SelectionTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   public static $modules = array('node', 'views', 'entity_reference', 'entity_reference_test', 'entity_test');
 
   /**
diff --git a/core/modules/field/src/Tests/DisplayApiTest.php b/core/modules/field/src/Tests/DisplayApiTest.php
index 513de0bc0986a3b6b70a5374f01424cf9caaad0b..4123ab31ee3112c83f7f473c97a88980b4d14c97 100644
--- a/core/modules/field/src/Tests/DisplayApiTest.php
+++ b/core/modules/field/src/Tests/DisplayApiTest.php
@@ -16,15 +16,6 @@
  */
 class DisplayApiTest extends FieldUnitTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * The field name to use in this test.
    *
diff --git a/core/modules/field/src/Tests/Email/EmailFieldTest.php b/core/modules/field/src/Tests/Email/EmailFieldTest.php
index bfc8e86bd383e04ad8646b29a7937931527df9ec..2ce3c46fcde370f096b779b0570d265ecdd946f3 100644
--- a/core/modules/field/src/Tests/Email/EmailFieldTest.php
+++ b/core/modules/field/src/Tests/Email/EmailFieldTest.php
@@ -17,15 +17,6 @@
  */
 class EmailFieldTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php b/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php
index 18808187960aa8bd10cdef9e6a42a4b01d41bb27..939cfc4db7bb10888a887f0c4f81b9a98aa15fa6 100644
--- a/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php
+++ b/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php
@@ -18,15 +18,6 @@
  */
 class FieldImportDeleteUninstallUiTest extends FieldTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/field/src/Tests/FormTest.php b/core/modules/field/src/Tests/FormTest.php
index fde1f290844ccc75f1ea427b17130d5b0ab590d1..92746244cc32f3aff6a719040ecfa385abfe593e 100644
--- a/core/modules/field/src/Tests/FormTest.php
+++ b/core/modules/field/src/Tests/FormTest.php
@@ -18,15 +18,6 @@
  */
 class FormTest extends FieldTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/field/src/Tests/Number/NumberFieldTest.php b/core/modules/field/src/Tests/Number/NumberFieldTest.php
index 0c1d558ce62819be06af17fcce1cea9f6ba45e0d..0c146ea7a12815c32c7ba9a72de64e726f92c670 100644
--- a/core/modules/field/src/Tests/Number/NumberFieldTest.php
+++ b/core/modules/field/src/Tests/Number/NumberFieldTest.php
@@ -17,15 +17,6 @@
  */
 class NumberFieldTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/field/src/Tests/ShapeItemTest.php b/core/modules/field/src/Tests/ShapeItemTest.php
index 05c1606ed37d5952d1f4f30dbb8b8f1a716f68ae..548d63e1c73e8f8125877b84faaacd727333a8b8 100644
--- a/core/modules/field/src/Tests/ShapeItemTest.php
+++ b/core/modules/field/src/Tests/ShapeItemTest.php
@@ -17,15 +17,6 @@
  */
 class ShapeItemTest extends FieldUnitTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/field/src/Tests/String/StringFieldTest.php b/core/modules/field/src/Tests/String/StringFieldTest.php
index 625d22c2632f7a8ad7c4aeec7469638bdf654d8d..fd5699eea1910759061929c8f163a5dde23c2205 100644
--- a/core/modules/field/src/Tests/String/StringFieldTest.php
+++ b/core/modules/field/src/Tests/String/StringFieldTest.php
@@ -17,15 +17,6 @@
  */
 class StringFieldTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/field/src/Tests/TestItemWithDependenciesTest.php b/core/modules/field/src/Tests/TestItemWithDependenciesTest.php
index 684cc0f0cc13b82a35c6dcb516192d526d524eba..b5ad7e123477d394a7f1afdb9cbd65b40e6c7a33 100644
--- a/core/modules/field/src/Tests/TestItemWithDependenciesTest.php
+++ b/core/modules/field/src/Tests/TestItemWithDependenciesTest.php
@@ -14,15 +14,6 @@
  */
 class TestItemWithDependenciesTest extends FieldUnitTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/field_ui/src/Tests/EntityDisplayTest.php b/core/modules/field_ui/src/Tests/EntityDisplayTest.php
index efcd9e05817c22a449e8e73e5421e54738ee11d4..9cfb55eaf8ba51f1c93044cd061c96d081d1b33d 100644
--- a/core/modules/field_ui/src/Tests/EntityDisplayTest.php
+++ b/core/modules/field_ui/src/Tests/EntityDisplayTest.php
@@ -17,15 +17,6 @@
  */
 class EntityDisplayTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   public static $modules = array('field_ui', 'field', 'entity_test', 'user', 'text', 'field_test', 'node', 'system', 'entity_reference');
 
   protected function setUp() {
diff --git a/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php b/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php
index 5ce4e9af1d24d34e37d6bb762fc90787e3e4780b..057d575c76133c2908970df9d2cced34900bb24b 100644
--- a/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php
+++ b/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php
@@ -17,15 +17,6 @@
  */
 class EntityFormDisplayTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   public static $modules = array('field_ui', 'field', 'entity_test', 'field_test', 'user', 'text', 'entity_reference');
 
   protected function setUp() {
diff --git a/core/modules/field_ui/src/Tests/ManageDisplayTest.php b/core/modules/field_ui/src/Tests/ManageDisplayTest.php
index 5c8e276abf52dd36a468f9027acbf6b27d6e633d..e628757d1accc8b3be74f2ecfe3f35860a2f5016 100644
--- a/core/modules/field_ui/src/Tests/ManageDisplayTest.php
+++ b/core/modules/field_ui/src/Tests/ManageDisplayTest.php
@@ -19,15 +19,6 @@
  */
 class ManageDisplayTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   use FieldUiTestTrait;
 
   /**
diff --git a/core/modules/field_ui/src/Tests/ManageFieldsTest.php b/core/modules/field_ui/src/Tests/ManageFieldsTest.php
index 84fbca612f1f3628db15a8279d5ef772169903d3..8c2adb66610e6a1a37a6ce33966a041141f42f0e 100644
--- a/core/modules/field_ui/src/Tests/ManageFieldsTest.php
+++ b/core/modules/field_ui/src/Tests/ManageFieldsTest.php
@@ -21,15 +21,6 @@
  */
 class ManageFieldsTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   use FieldUiTestTrait;
 
   /**
diff --git a/core/modules/image/src/Tests/ImageDimensionsTest.php b/core/modules/image/src/Tests/ImageDimensionsTest.php
index 2b057576c980dfd3c55515196bc04c4f2e5c9408..4d6c76b37533de7d200d3b217cdfef72b0299eb5 100644
--- a/core/modules/image/src/Tests/ImageDimensionsTest.php
+++ b/core/modules/image/src/Tests/ImageDimensionsTest.php
@@ -16,11 +16,6 @@
  */
 class ImageDimensionsTest extends WebTestBase {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/image/src/Tests/ImageFieldTestBase.php b/core/modules/image/src/Tests/ImageFieldTestBase.php
index 0360318931f0359b02659b3806d8587df08bc4a6..2b8a648fc2dc2c497155ec54f2d9c8fcdd10e48c 100644
--- a/core/modules/image/src/Tests/ImageFieldTestBase.php
+++ b/core/modules/image/src/Tests/ImageFieldTestBase.php
@@ -27,15 +27,6 @@
  */
 abstract class ImageFieldTestBase extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/link/src/Tests/LinkFieldTest.php b/core/modules/link/src/Tests/LinkFieldTest.php
index 685b14539c4e92323f039bcd35e2cd1993f99213..97058f045a893cd8bec7e0978515f6b959ab34e2 100644
--- a/core/modules/link/src/Tests/LinkFieldTest.php
+++ b/core/modules/link/src/Tests/LinkFieldTest.php
@@ -20,15 +20,6 @@
  */
 class LinkFieldTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php b/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php
index 35382674524af8b7bcb4ddc84e09aff0f50b145b..91e20ff9ea3e7c1ee2ade9ad0c5e513288d43dc0 100644
--- a/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php
+++ b/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php
@@ -14,15 +14,6 @@
  */
 abstract class MigrateDrupalTestBase extends MigrateTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
index df97d24d474ad39f740c58caa55b25c1738b17ae..31f206dcb8321ceea63bc33b34e0466bcb33c5b0 100644
--- a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
+++ b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
@@ -19,15 +19,6 @@
  */
 class MigrateFieldInstanceTest extends MigrateDrupalTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldWidgetSettingsTest.php b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldWidgetSettingsTest.php
index e970272a7a27d9f3d7dc7e67d81299e4f7c0354d..09b922c87b2b00da68d0d8113b3ac87bdc0e5bb6 100644
--- a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldWidgetSettingsTest.php
+++ b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldWidgetSettingsTest.php
@@ -17,15 +17,6 @@
  */
 class MigrateFieldWidgetSettingsTest extends MigrateDrupalTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/options/src/Tests/OptionsFloatFieldImportTest.php b/core/modules/options/src/Tests/OptionsFloatFieldImportTest.php
index a555339de046d514ea2e178bdb1810841afd3baa..0f8414f5eae135234de4dc42d20e750b9ebeda53 100644
--- a/core/modules/options/src/Tests/OptionsFloatFieldImportTest.php
+++ b/core/modules/options/src/Tests/OptionsFloatFieldImportTest.php
@@ -18,15 +18,6 @@
  */
 class OptionsFloatFieldImportTest extends FieldTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/quickedit/src/Tests/QuickEditTestBase.php b/core/modules/quickedit/src/Tests/QuickEditTestBase.php
index 1536194c3c4c8a88de250746b8fa84c8f373d1d4..fbbd1a735a9aaa8cb292891c083f991934dea853 100644
--- a/core/modules/quickedit/src/Tests/QuickEditTestBase.php
+++ b/core/modules/quickedit/src/Tests/QuickEditTestBase.php
@@ -14,15 +14,6 @@
  */
 abstract class QuickEditTestBase extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/search/src/Tests/SearchTokenizerTest.php b/core/modules/search/src/Tests/SearchTokenizerTest.php
index b3361a90000574a2067a4f83a4d5da0d423d5178..efaf09d1758c113dfafcfec5961a65c100643032 100644
--- a/core/modules/search/src/Tests/SearchTokenizerTest.php
+++ b/core/modules/search/src/Tests/SearchTokenizerTest.php
@@ -15,11 +15,6 @@
  */
 class SearchTokenizerTest extends SearchTestBase {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Verifies that strings of CJK characters are tokenized.
    *
diff --git a/core/modules/simpletest/src/TestBase.php b/core/modules/simpletest/src/TestBase.php
index a766d63aaa3023f807bbe6c791f0a425cde492db..806281e92a1bb300f53fc9624c1577c602a5b0e3 100644
--- a/core/modules/simpletest/src/TestBase.php
+++ b/core/modules/simpletest/src/TestBase.php
@@ -209,7 +209,7 @@ abstract class TestBase {
    *
    * @var bool
    */
-  protected $strictConfigSchema = FALSE;
+  protected $strictConfigSchema = TRUE;
 
   /**
    * Constructor for Test.
diff --git a/core/modules/statistics/src/Tests/StatisticsReportsTest.php b/core/modules/statistics/src/Tests/StatisticsReportsTest.php
index eed80f707f3dd908e97d357c39d1a63f9fc92337..3ec956a06b1976e83e20dd2c8d53cbea6ed41786 100644
--- a/core/modules/statistics/src/Tests/StatisticsReportsTest.php
+++ b/core/modules/statistics/src/Tests/StatisticsReportsTest.php
@@ -14,11 +14,6 @@
  */
 class StatisticsReportsTest extends StatisticsTestBase {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Tests the "popular content" block.
    */
diff --git a/core/modules/system/src/Tests/Batch/PageTest.php b/core/modules/system/src/Tests/Batch/PageTest.php
index c4b1b70141bb7a63fedba9936601b72017aea72b..42800b76c70374d821bb5e4be367a154038e2363 100644
--- a/core/modules/system/src/Tests/Batch/PageTest.php
+++ b/core/modules/system/src/Tests/Batch/PageTest.php
@@ -16,15 +16,6 @@
  */
 class PageTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php b/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php
index 4c8269ab586121a4f349b9ecc29bd202ca851dca..681ebaad506e884803e45ba9b1d31dbf7a4d1de5 100644
--- a/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php
@@ -15,15 +15,6 @@
  */
 class EntityQueryRelationshipTest extends EntityUnitTestBase  {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php b/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php
index 93f75df658c88a468698ac601fbaed11edeb270b..aa2d800c8b471c5093b19432e6fee4ca36ac2b8c 100644
--- a/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php
@@ -16,15 +16,6 @@
  */
 class EntityViewControllerTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php b/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php
index 36c17d9aa9971ea16f54384ee9a336e738a17008..50d299c05dceaf29c456c304a051e519589203bc 100644
--- a/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php
+++ b/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php
@@ -18,15 +18,6 @@
  */
 class ThemeHandlerTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/system/src/Tests/Form/FormObjectTest.php b/core/modules/system/src/Tests/Form/FormObjectTest.php
index c41928a29387246824bb53b4e37ea79bee7dba6d..237d9e74a4afe7fb7d6a29e8a2596de0c2b5ba7a 100644
--- a/core/modules/system/src/Tests/Form/FormObjectTest.php
+++ b/core/modules/system/src/Tests/Form/FormObjectTest.php
@@ -17,15 +17,6 @@
  */
 class FormObjectTest extends SystemConfigFormTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/system/src/Tests/Menu/BreadcrumbTest.php b/core/modules/system/src/Tests/Menu/BreadcrumbTest.php
index 22a2f7da35c811785ce1f35736a43e09a0b5490e..6909a38fecaf44a817a0aefa5c56796e9a8c57a0 100644
--- a/core/modules/system/src/Tests/Menu/BreadcrumbTest.php
+++ b/core/modules/system/src/Tests/Menu/BreadcrumbTest.php
@@ -18,15 +18,6 @@
  */
 class BreadcrumbTest extends MenuTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/system/src/Tests/Menu/MenuRouterTest.php b/core/modules/system/src/Tests/Menu/MenuRouterTest.php
index 4dd2e19135d3f8c25239991e2f55fb1eecc9689a..7de9006880ffdf07291400a1117caa83a8dd762e 100644
--- a/core/modules/system/src/Tests/Menu/MenuRouterTest.php
+++ b/core/modules/system/src/Tests/Menu/MenuRouterTest.php
@@ -16,15 +16,6 @@
  */
 class MenuRouterTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/system/src/Tests/System/PageTitleTest.php b/core/modules/system/src/Tests/System/PageTitleTest.php
index 31020c9dd25ce3835210d2478e830e822b075d6d..98148cd06d5081d148189138f65168ab11628528 100644
--- a/core/modules/system/src/Tests/System/PageTitleTest.php
+++ b/core/modules/system/src/Tests/System/PageTitleTest.php
@@ -19,15 +19,6 @@
  */
 class PageTitleTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/system/src/Tests/System/ThemeTest.php b/core/modules/system/src/Tests/System/ThemeTest.php
index 8a7fd040aa17919ae1325c1c8725ad877a851c86..80d469ac0f67ee647c5779679552f32d6a1ecdac 100644
--- a/core/modules/system/src/Tests/System/ThemeTest.php
+++ b/core/modules/system/src/Tests/System/ThemeTest.php
@@ -18,15 +18,6 @@
  */
 class ThemeTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/taxonomy/src/Tests/VocabularyCrudTest.php b/core/modules/taxonomy/src/Tests/VocabularyCrudTest.php
index f2f7b54c64d1e98dc7f1aafd76809ccc340fc5e7..d5aaa5685285e3451a24b191d1b35edcbe471c58 100644
--- a/core/modules/taxonomy/src/Tests/VocabularyCrudTest.php
+++ b/core/modules/taxonomy/src/Tests/VocabularyCrudTest.php
@@ -17,11 +17,6 @@
  */
 class VocabularyCrudTest extends TaxonomyTestBase {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/tour/src/Tests/TourTest.php b/core/modules/tour/src/Tests/TourTest.php
index ee8ea7b47d67c99e01b022b61a1970abf99ae17f..8ed261c2b7aafbecbb79859340bd226529e8630b 100644
--- a/core/modules/tour/src/Tests/TourTest.php
+++ b/core/modules/tour/src/Tests/TourTest.php
@@ -16,11 +16,6 @@
  */
 class TourTest extends TourTestBasic {
 
-  /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/views/src/Tests/ViewTestBase.php b/core/modules/views/src/Tests/ViewTestBase.php
index b7ab8c1a525419a3d2fb139b497f7a9332b19a0c..c33776d6610cbbeb1fc3927dc07d3b150b31a457 100644
--- a/core/modules/views/src/Tests/ViewTestBase.php
+++ b/core/modules/views/src/Tests/ViewTestBase.php
@@ -23,15 +23,6 @@
  */
 abstract class ViewTestBase extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/views/src/Tests/ViewUnitTestBase.php b/core/modules/views/src/Tests/ViewUnitTestBase.php
index a5bdd3e9819a3a8834864a3ac6abebb92c5dedbc..0d07484f1cc0cf6f49f5b52308a0e685e952ea77 100644
--- a/core/modules/views/src/Tests/ViewUnitTestBase.php
+++ b/core/modules/views/src/Tests/ViewUnitTestBase.php
@@ -24,15 +24,6 @@
  */
 abstract class ViewUnitTestBase extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/views/src/Tests/Wizard/WizardTestBase.php b/core/modules/views/src/Tests/Wizard/WizardTestBase.php
index 16907b824b97353efc45c6fca05fa1bf576cfd3b..0a2e998080b4c3f15abc6ea7e96819ddd5988375 100644
--- a/core/modules/views/src/Tests/Wizard/WizardTestBase.php
+++ b/core/modules/views/src/Tests/Wizard/WizardTestBase.php
@@ -14,15 +14,6 @@
  */
 abstract class WizardTestBase extends ViewTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *
diff --git a/core/modules/views_ui/src/Tests/NewViewConfigSchemaTest.php b/core/modules/views_ui/src/Tests/NewViewConfigSchemaTest.php
index 315d17a44fa7a1b3b38796302a620f14c8ad92b7..69239b41734833935b6247cca583af8b0c6cd608 100644
--- a/core/modules/views_ui/src/Tests/NewViewConfigSchemaTest.php
+++ b/core/modules/views_ui/src/Tests/NewViewConfigSchemaTest.php
@@ -16,15 +16,6 @@
  */
 class NewViewConfigSchemaTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   /**
    * Modules to enable.
    *