Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/demohatinco/public_html/hat_learning_management/vendor/sebastian/diff/tests/Utils/UnifiedDiffAssertTraitTest.php:18 Stack trace: #0 {main} thrown in /home/demohatinco/public_html/hat_learning_management/vendor/sebastian/diff/tests/Utils/UnifiedDiffAssertTraitTest.php on line 18