diff --git a/core/modules/config/src/Tests/ConfigCRUDTest.php b/core/modules/config/src/Tests/ConfigCRUDTest.php
index a751997..4c3642e 100644
--- a/core/modules/config/src/Tests/ConfigCRUDTest.php
+++ b/core/modules/config/src/Tests/ConfigCRUDTest.php
@@ -24,20 +24,20 @@
 class ConfigCRUDTest extends KernelTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
+   * Exempt from strict schema checking.
    *
    * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
    *
    * @var bool
    */
-  protected $strictConfigSchema = TRUE;
+  protected $strictConfigSchema = FALSE;
 
   /**
    * Modules to enable.
    *
    * @var array
    */
-  public static $modules = array('system', 'config_test');
+  public static $modules = array('system');
 
   /**
    * Tests CRUD operations.
@@ -222,6 +222,7 @@ function testValueValidation() {
    * Tests data type handling.
    */
   public function testDataTypes() {
+    \Drupal::service('module_installer')->install(array('config_test'));
     $storage = new DatabaseStorage($this->container->get('database'), 'config');
     $name = 'config_test.types';
     $config = $this->container->get('config.factory')->get($name);
diff --git a/core/modules/config/src/Tests/ConfigFileContentTest.php b/core/modules/config/src/Tests/ConfigFileContentTest.php
index 03cad33..c1b2432 100644
--- a/core/modules/config/src/Tests/ConfigFileContentTest.php
+++ b/core/modules/config/src/Tests/ConfigFileContentTest.php
@@ -25,13 +25,13 @@ class ConfigFileContentTest extends KernelTestBase {
   public static $modules = array('config_test');
 
   /**
-   * Set to TRUE to strict check all configuration saved.
+   * Exempt from strict schema checking.
    *
    * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
    *
    * @var bool
    */
-  protected $strictConfigSchema = TRUE;
+  protected $strictConfigSchema = FALSE;
 
   /**
    * Tests setting, writing, and reading of a configuration setting.
diff --git a/core/modules/config/tests/config_test/config/schema/config_test.schema.yml b/core/modules/config/tests/config_test/config/schema/config_test.schema.yml
index feff6cf..9240d4b 100644
--- a/core/modules/config/tests/config_test/config/schema/config_test.schema.yml
+++ b/core/modules/config/tests/config_test/config/schema/config_test.schema.yml
@@ -112,20 +112,6 @@ config_test.system:
       type: string
       label: '404'
 
-config_test.crud:
-  type: mapping
-  label: 'Configuration test'
-  mapping:
-    value:
-      type: string
-      label: 'Value'
-    '404':
-      type: string
-      label: '404'
-
-config_test.crud_rename_no_cache:
-  type: config_test.crud
-
 config_test.new:
   type: mapping
   label: 'Configuration test'
@@ -160,63 +146,3 @@ config_test.foo:
 
 config_test.bar:
   type: config_test.foo
-
-namespace.object:
-  type: mapping
-
-foo.bar:
-  type: mapping
-  mapping:
-    foo:
-      type: string
-    biff:
-      type: mapping
-      mapping:
-        bang:
-          type: string
-    array:
-      type: mapping
-      mapping:
-        foo:
-          type: string
-        biff:
-          type: mapping
-          mapping:
-            bang:
-              type: string
-    nested:
-      type: mapping
-      mapping:
-        array:
-          type: mapping
-          mapping:
-            foo:
-              type: string
-            biff:
-              type: mapping
-              mapping:
-                bang:
-                  type: string
-    'false':
-      type: boolean
-    'true':
-      type: boolean
-    'null':
-      type: string
-    casting_array:
-      type: mapping
-      mapping:
-        cast:
-          type: mapping
-          mapping:
-            'false':
-              type: boolean
-
-foo.baz:
-  type: mapping
-  mapping:
-    foo:
-      type: string
-
-biff.bang:
-  type: foo.baz