Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\admin\vendor\symfony\http-client-contracts\Test\HttpClientTestCase.php:24 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\symfony\http-client-contracts\Test\HttpClientTestCase.php on line 24