Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\Apache24\www\lupin\back-end\vendor\laravel\framework\src\Illuminate\Foundation\Testing\TestCase.php:25 Stack trace: #0 {main} thrown in D:\Apache24\www\lupin\back-end\vendor\laravel\framework\src\Illuminate\Foundation\Testing\TestCase.php on line 25