Fatal error: Uncaught Error: Class "MediaWiki\Tests\Specials\SpecialPageTestBase" not found in /var/www/html/w/tests/phpunit/includes/Specials/SpecialPreferencesTest.php:20 Stack trace: #0 {main} thrown in /var/www/html/w/tests/phpunit/includes/Specials/SpecialPreferencesTest.php on line 20