Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\com.arbokcorp.app\vendor\symfony\http-foundation\Tests\RequestStackTest.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\com.arbokcorp.app\vendor\symfony\http-foundation\Tests\RequestStackTest.php on line 18