Fatal error: Uncaught Error: Class "Wikimedia\FileBackend\FSFile\FSFile" not found in /var/www/html/w/tests/phpunit/mocks/FileBackend/MockFSFile.php:24 Stack trace: #0 {main} thrown in /var/www/html/w/tests/phpunit/mocks/FileBackend/MockFSFile.php on line 24