Fatal error: Uncaught Error: Class "MediaWikiIntegrationTestCase" not found in /var/www/html/w/tests/phpunit/integration/includes/Mail/ConfirmEmail/ConfirmEmailSenderTest.php:19 Stack trace: #0 {main} thrown in /var/www/html/w/tests/phpunit/integration/includes/Mail/ConfirmEmail/ConfirmEmailSenderTest.php on line 19