Fatal error: Uncaught Error: Class "MediaWiki\Extension\DiscussionTools\Tests\IntegrationTestCase" not found in /var/www/html/extensions/DiscussionTools/tests/phpunit/CommentFormatterTest.php:21 Stack trace: #0 {main} thrown in /var/www/html/extensions/DiscussionTools/tests/phpunit/CommentFormatterTest.php on line 21