Fatal error: Uncaught Error: Class "MediaWikiIntegrationTestCase" not found in /var/www/html/orian-wiki/tests/phpunit/includes/ResourceLoader/DerivativeContextTest.php:19 Stack trace: #0 {main} thrown in /var/www/html/orian-wiki/tests/phpunit/includes/ResourceLoader/DerivativeContextTest.php on line 19