Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /opt/lampp/htdocs/kuesioner/vendor/sebastian/diff/tests/Output/Integration/UnifiedDiffOutputBuilderIntegrationTest.php:25 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/kuesioner/vendor/sebastian/diff/tests/Output/Integration/UnifiedDiffOutputBuilderIntegrationTest.php on line 25