Fatal error: Uncaught Error: Class 'Orchestra\Testbench\TestCase' not found in C:\xampp\htdocs\rabani-laravel-firebird\vendor\laravel\ui\tests\AuthBackend\RegistersUsersTest.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\rabani-laravel-firebird\vendor\laravel\ui\tests\AuthBackend\RegistersUsersTest.php on line 17