diff --git a/core/modules/contact/src/Tests/ContactPersonalTest.php b/core/modules/contact/src/Tests/ContactPersonalTest.php
index 51124c9..2e091c5 100644
--- a/core/modules/contact/src/Tests/ContactPersonalTest.php
+++ b/core/modules/contact/src/Tests/ContactPersonalTest.php
@@ -19,6 +19,15 @@
 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.
    *
    * @var array
diff --git a/core/modules/contact/src/Tests/ContactSitewideTest.php b/core/modules/contact/src/Tests/ContactSitewideTest.php
index be909f5..5131a44 100644
--- a/core/modules/contact/src/Tests/ContactSitewideTest.php
+++ b/core/modules/contact/src/Tests/ContactSitewideTest.php
@@ -21,6 +21,15 @@
 class ContactSitewideTest 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.
    *
    * @var array
diff --git a/core/modules/contact/src/Tests/ContactStorageTest.php b/core/modules/contact/src/Tests/ContactStorageTest.php
index 79b3cfd..6cb9bdf 100644
--- a/core/modules/contact/src/Tests/ContactStorageTest.php
+++ b/core/modules/contact/src/Tests/ContactStorageTest.php
@@ -8,7 +8,6 @@
 namespace Drupal\contact\Tests;
 
 use Drupal\Component\Utility\Unicode;
-use Drupal\config\Tests\SchemaCheckTestTrait;
 use Drupal\contact\Entity\Message;
 
 /**
@@ -16,8 +15,6 @@
  */
 class ContactStorageTest extends ContactSitewideTest {
 
-  use SchemaCheckTestTrait;
-
   /**
    * Modules to enable.
    *
@@ -79,7 +76,6 @@ public function testContactStorage() {
 
     $config = \Drupal::config("contact.form.$id");
     $this->assertEqual($config->get('id'), $id);
-    $this->assertConfigSchema(\Drupal::service('config.typed'), $config->getName(), $config->get());
   }
 
 }
diff --git a/core/modules/contact/src/Tests/Views/ContactLinkTest.php b/core/modules/contact/src/Tests/Views/ContactLinkTest.php
index bb7fb91..060d1b8 100644
--- a/core/modules/contact/src/Tests/Views/ContactLinkTest.php
+++ b/core/modules/contact/src/Tests/Views/ContactLinkTest.php
@@ -19,6 +19,15 @@
 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.
    *
    * @var \Drupal\user\UserDataInterface