Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in T:\Xampp\htdocs\notice\vendor\laravel\framework\src\Illuminate\Foundation\Testing\TestCase.php:20 Stack trace: #0 {main} thrown in T:\Xampp\htdocs\notice\vendor\laravel\framework\src\Illuminate\Foundation\Testing\TestCase.php on line 20