Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/ilias/components/ILIAS/MetaData/tests/OERHarvester/XML/WriterTest.php:31 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/MetaData/tests/OERHarvester/XML/WriterTest.php on line 31