Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\r10ca\vendor\laravel\framework\tests\Testing\TestResponseTest.php:33 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\laravel\framework\tests\Testing\TestResponseTest.php on line 33