Fatal error: Uncaught Error: Class "MediaWikiIntegrationTestCase" not found in /var/www/html/orian-wiki/extensions/Math/tests/phpunit/MathMathMLTest.php:17 Stack trace: #0 {main} thrown in /var/www/html/orian-wiki/extensions/Math/tests/phpunit/MathMathMLTest.php on line 17