diff --git c/core/modules/system/tests/modules/plugin_test/lib/Drupal/plugin_test/Controller/PluginTest.php w/core/modules/system/tests/modules/plugin_test/lib/Drupal/plugin_test/Controller/PluginTest.php
index b4e1116..090a446 100644
--- c/core/modules/system/tests/modules/plugin_test/lib/Drupal/plugin_test/Controller/PluginTest.php
+++ w/core/modules/system/tests/modules/plugin_test/lib/Drupal/plugin_test/Controller/PluginTest.php
@@ -19,10 +19,10 @@ class PluginTest {
    * @return array
    *   A renderable array of plugin labels.
    */
-  function testDefinitions() {
+  public function testDefinitions() {
     $manager = new CachedMockBlockManager();
     $output = array();
-    foreach($manager->getDefinitions() as $plugin_id => $definition) {
+    foreach ($manager->getDefinitions() as $plugin_id => $definition) {
       $output[$plugin_id] = array(
         '#markup' => $definition['label'],
       );
diff --git c/core/modules/system/tests/modules/plugin_test/plugin_test.module w/core/modules/system/tests/modules/plugin_test/plugin_test.module
index 8dd0c6f..036cd97 100644
--- c/core/modules/system/tests/modules/plugin_test/plugin_test.module
+++ w/core/modules/system/tests/modules/plugin_test/plugin_test.module
@@ -21,7 +21,6 @@ function plugin_test_plugin_test_alter(&$definitions) {
 function plugin_test_menu() {
   $items = array();
   $items['plugin_definition_test'] = array(
-    'access callback' => TRUE,
     'route_name' => 'plugin_test_definitions',
   );
   return $items;