Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/malert/WebDAV/vendor/sabre/vobject/tests/VObject/Component/VAvailabilityTest.php:15 Stack trace: #0 {main} thrown in /home/malert/WebDAV/vendor/sabre/vobject/tests/VObject/Component/VAvailabilityTest.php on line 15