Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\laravel\framework\src\Illuminate\Foundation\Testing\TestCase.php:18 Stack trace: #0 {main} thrown in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\laravel\framework\src\Illuminate\Foundation\Testing\TestCase.php on line 18