Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\www\Apache24\htdocs\agenda-dif\vendor\laravel\framework\src\Illuminate\Foundation\Testing\TestCase.php:21 Stack trace: #0 {main} thrown in C:\www\Apache24\htdocs\agenda-dif\vendor\laravel\framework\src\Illuminate\Foundation\Testing\TestCase.php on line 21