Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /opt/lampp/htdocs/kuesioner/vendor/psy/psysh/test/CodeCleanerTest.php:16 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/kuesioner/vendor/psy/psysh/test/CodeCleanerTest.php on line 16