Fatal error: Uncaught Error: Class "MediaWikiIntegrationTestCase" not found in /var/www/html/extensions/MobileFrontend/tests/phpunit/integration/features/FeaturesManagerTest.php:12 Stack trace: #0 {main} thrown in /var/www/html/extensions/MobileFrontend/tests/phpunit/integration/features/FeaturesManagerTest.php on line 12