Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /opt/lampp/htdocs/kuesioner/vendor/theseer/tokenizer/tests/TokenTest.php:6 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/kuesioner/vendor/theseer/tokenizer/tests/TokenTest.php on line 6