Fatal error: Uncaught Error: Class "Orchestra\Testbench\TestCase" not found in D:\xampp\htdocs\ebaymotors\vendor\laravel\ui\tests\AuthBackend\AuthenticatesUsersTest.php:16 Stack trace: #0 {main} thrown in D:\xampp\htdocs\ebaymotors\vendor\laravel\ui\tests\AuthBackend\AuthenticatesUsersTest.php on line 16