Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /opt/lampp/htdocs/kuesioner/vendor/sebastian/comparator/tests/SplObjectStorageComparatorTest.php:23 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/kuesioner/vendor/sebastian/comparator/tests/SplObjectStorageComparatorTest.php on line 23