diff --git a/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php b/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php
index 57a5a08..8b67ec8 100644
--- a/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php
+++ b/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php
@@ -106,7 +106,7 @@ public function testRoleAccessProvider() {
     $account_none = new User(array('uid' => 4), 'user');
     $this->accounts[] = $account_none;
 
-    // Setup expected values, so which path can be access by which user.
+    // Setup expected values; so which path can be access by which user.
     return array(
       array('role_test_1', array($account_1, $account_12)),
       array('role_test_2', array($account_2, $account_12)),
@@ -114,7 +114,17 @@ public function testRoleAccessProvider() {
     );
   }
 
+  /**
+   * Returns accounts filtered by the passed in accounts.
+   *
+   * @param array $grant_users
+   *   A list of users which should not be part of the result list.
+   *
+   * @return array
+   *   All users which are not granted.
+   */
   public function accountsToDeny($grant_users) {
+//    return array_diff_assoc($this->accounts, $grant_users);
     return array_filter($this->accounts, function($account) use ($grant_users) {
       foreach ($grant_users as $grant_user) {
         if ($account == $grant_user) {