Fatal error: Uncaught Error: Class "MediaWiki\Tests\ExtensionJsonTestBase" not found in C:\xampp\htdocs\extensions\CheckUser\tests\phpunit\integration\CheckUserExtensionJsonTest.php:12 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\CheckUser\tests\phpunit\integration\CheckUserExtensionJsonTest.php on line 12