Fatal error: Uncaught Error: Class "MediaWiki\Tests\Api\ApiTestCase" not found in C:\xampp\htdocs\extensions\VisualEditor\tests\phpunit\ApiVisualEditorTest.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\VisualEditor\tests\phpunit\ApiVisualEditorTest.php on line 17