Fatal error: Uncaught Error: Class "ilChatroomAbstractTestBase" not found in /var/www/html/ilias/components/ILIAS/Chatroom/tests/ilObjChatroomTest.php:25 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Chatroom/tests/ilObjChatroomTest.php on line 25