Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/malert/WebDAV/vendor/sabre/vobject/tests/VObject/VCard21Test.php:10 Stack trace: #0 {main} thrown in /home/malert/WebDAV/vendor/sabre/vobject/tests/VObject/VCard21Test.php on line 10