diff --git a/core/tests/Drupal/Tests/Core/Form/FormCacheTest.php b/core/tests/Drupal/Tests/Core/Form/FormCacheTest.php
index f6cdd5a..6bf428c 100644
--- a/core/tests/Drupal/Tests/Core/Form/FormCacheTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormCacheTest.php
@@ -114,7 +114,13 @@ protected function setUp() {
         ['form_state', $this->formStateCacheStore],
       ]));
 
-    $this->configFactory = $this->getMockBuilder('Drupal\Core\Config\ConfigFactory');
+    $this->configFactory = $this->getConfigFactoryStub(
+      [
+        'system.form' => [
+          'cache_lifetime' => 21600
+        ]
+      ]
+    );
 
     $this->csrfToken = $this->getMockBuilder('Drupal\Core\Access\CsrfTokenGenerator')
       ->disableOriginalConstructor()