Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\com.arbokcorp.app\vendor\symfony\http-kernel\Tests\DependencyInjection\MergeExtensionConfigurationPassTest.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\com.arbokcorp.app\vendor\symfony\http-kernel\Tests\DependencyInjection\MergeExtensionConfigurationPassTest.php on line 19