Fatal error: Uncaught Error: Class "MediaWiki\Content\ContentHandler" not found in /var/www/html/w/tests/phpunit/mocks/Content/DummyContentHandlerForTesting.php:10 Stack trace: #0 {main} thrown in /var/www/html/w/tests/phpunit/mocks/Content/DummyContentHandlerForTesting.php on line 10