Fatal error: Uncaught Error: Class "MediaWiki\Extension\Notifications\Mapper\AbstractMapper" not found in /var/www/html/orian-wiki/extensions/Echo/tests/phpunit/Mapper/EchoAbstractMapperStub.php:8 Stack trace: #0 {main} thrown in /var/www/html/orian-wiki/extensions/Echo/tests/phpunit/Mapper/EchoAbstractMapperStub.php on line 8