Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\laravel\framework\tests\Foundation\Http\Middleware\ConvertEmptyStringsToNullTest.php:10 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\laravel\framework\tests\Foundation\Http\Middleware\ConvertEmptyStringsToNullTest.php on line 10