Fatal error: Uncaught Error: Class 'Sabre\DAV\Xml\XmlTest' not found in /home/malert/WebDAV/vendor/sabre/dav/tests/Sabre/CalDAV/Xml/Property/SupportedCollationSetTest.php:8 Stack trace: #0 {main} thrown in /home/malert/WebDAV/vendor/sabre/dav/tests/Sabre/CalDAV/Xml/Property/SupportedCollationSetTest.php on line 8