Fatal error: Uncaught Error: Class "MediaWikiIntegrationTestCase" not found in C:\xampp\htdocs\extensions\Gadgets\tests\phpunit\integration\GadgetDefinitionContentHandlerTest.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\Gadgets\tests\phpunit\integration\GadgetDefinitionContentHandlerTest.php on line 15