diff --git a/core/tests/Drupal/Tests/Core/Messenger/MessengerTest.php b/core/tests/Drupal/Tests/Core/Messenger/MessengerTest.php
index ccdd46d..4394956 100644
--- a/core/tests/Drupal/Tests/Core/Messenger/MessengerTest.php
+++ b/core/tests/Drupal/Tests/Core/Messenger/MessengerTest.php
@@ -63,7 +63,11 @@ public function tearDown() {
   }
 
   /**
-   * Tests the messenger.
+   * @covers ::addMessage
+   * @covers ::getMessages
+   * @covers ::getMessagesByType
+   * @covers ::deleteMessages
+   * @covers ::deleteMessagesByType
    */
   public function testMessenger() {
     $message_a = $this->randomName();