Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in D:\xampp\htdocs\api_patient\vendor\laravel\lumen-framework\src\Testing\TestCase.php:12 Stack trace: #0 {main} thrown in D:\xampp\htdocs\api_patient\vendor\laravel\lumen-framework\src\Testing\TestCase.php on line 12