diff --git a/core/modules/system/tests/modules/common_test/common_test.routing.yml b/core/modules/system/tests/modules/common_test/common_test.routing.yml
index b5de545..fb27e33 100644
--- a/core/modules/system/tests/modules/common_test/common_test.routing.yml
+++ b/core/modules/system/tests/modules/common_test/common_test.routing.yml
@@ -7,6 +7,7 @@ common_test_l_active_class:
 common_test_drupal_render_invalid_keys:
   pattern: 'common-test/drupal-render-invalid-keys'
   defaults:
+    _title: 'Drupal Render'
     _content: '\Drupal\common_test\Controller\CommonTestController::drupalRenderInvalidKeys'
   requirements:
     _permission: 'access content'
diff --git a/core/modules/system/tests/modules/common_test/lib/Drupal/common_test/Controller/CommonTestController.php b/core/modules/system/tests/modules/common_test/lib/Drupal/common_test/Controller/CommonTestController.php
index be2a182..93ca243 100644
--- a/core/modules/system/tests/modules/common_test/lib/Drupal/common_test/Controller/CommonTestController.php
+++ b/core/modules/system/tests/modules/common_test/lib/Drupal/common_test/Controller/CommonTestController.php
@@ -61,21 +61,18 @@ public function typeLinkActiveClass() {
 
   /**
    * Renders an element with an invalid render array key.
+   *
+   * @return array
+   *   A render array.
    */
   public function drupalRenderInvalidKeys() {
-    drupal_set_title('Drupal Render');
-
     define('SIMPLETEST_COLLECT_ERRORS', FALSE);
 
     // Keys that begin with # may contain a value of any type, otherwise they must
     // contain arrays.
-    $key = 'child';
-    $value = 'This should be an array.';
-    $element = array(
-      $key => $value,
-    );
+    $element = array('child' => 'This should be an array.');
 
-    return drupal_render($element);
+    return $element;
   }
 
 }