diff --git a/core/tests/Drupal/Tests/Core/Menu/LocalActionManagerTest.php b/core/tests/Drupal/Tests/Core/Menu/LocalActionManagerTest.php
index b38c350..35dd4d7 100644
--- a/core/tests/Drupal/Tests/Core/Menu/LocalActionManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/LocalActionManagerTest.php
@@ -144,6 +144,9 @@ public function testGetTitle() {
    * @dataProvider getActionsForRouteProvider
    */
   public function testGetActionsForRoute($route_appears, array $plugin_definitions, array $expected_actions) {
+    $this->moduleHandler->expects($this->once())
+      ->method('getModuleDirectories')
+      ->willReturn(array());
     $this->discovery->expects($this->any())
       ->method('getDefinitions')
       ->will($this->returnValue($plugin_definitions));