Fatal error: Uncaught Error: Class "MediaWikiIntegrationTestCase" not found in C:\xampp\htdocs\extensions\VisualEditor\tests\phpunit\integration\VisualEditorParsoidClientFactoryTest.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\VisualEditor\tests\phpunit\integration\VisualEditorParsoidClientFactoryTest.php on line 16