Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/wittyly/public_html/live/wittymanager-api/vendor/sebastian/diff/tests/DifferTest.php:24 Stack trace: #0 {main} thrown in /home/wittyly/public_html/live/wittymanager-api/vendor/sebastian/diff/tests/DifferTest.php on line 24