diff --git a/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php b/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php
index 59b2fb3..57a5a08 100644
--- a/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php
+++ b/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php
@@ -18,7 +18,9 @@
 use Symfony\Component\Routing\RouteCollection;
 
 // Needed because the Entity class calls it.
-define('LANGUAGE_NOT_SPECIFIED', 'und');
+if (!defined('LANGUAGE_NOT_SPECIFIED')) {
+  define('LANGUAGE_NOT_SPECIFIED', 'und');
+}
 
 /**
  * Defines tests for role based access in routes.
@@ -77,7 +79,7 @@ protected function getTestRouteCollection() {
   }
 
   /**
-   * Tests role requirements on routes.
+   * Provides data for the role access test.
    */
   public function testRoleAccessProvider() {
     // Setup two different roles used in the test.
@@ -124,6 +126,8 @@ public function accountsToDeny($grant_users) {
   }
 
   /**
+   * Tests role requirements on routes.
+   *
    * @dataProvider testRoleAccessProvider
    */
   public function testRoleAccess($path, $grant_accounts) {
@@ -149,4 +153,5 @@ public function testRoleAccess($path, $grant_accounts) {
       $this->assertEmpty($has_access , $message);
     }
   }
+
 }