Fatal error: Uncaught Error: Class "MediaWikiIntegrationTestCase" not found in /var/www/html/extensions/VisualEditor/tests/phpunit/integration/VisualEditorParsoidClientFactoryTest.php:16 Stack trace: #0 {main} thrown in /var/www/html/extensions/VisualEditor/tests/phpunit/integration/VisualEditorParsoidClientFactoryTest.php on line 16