Fatal error: Uncaught Error: Class "advanced_testcase" not found in C:\xampp\htdocs\moodle\question\bank\previewquestion\tests\qbank_preview_helper_test.php:35 Stack trace: #0 {main} thrown in C:\xampp\htdocs\moodle\question\bank\previewquestion\tests\qbank_preview_helper_test.php on line 35