Fatal error: Uncaught Error: Class "ilChatroomAbstractTestBase" not found in /var/www/html/ilias/components/ILIAS/Chatroom/tests/ilChatroomUserTest.php:27 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Chatroom/tests/ilChatroomUserTest.php on line 27