Fatal error: Uncaught Error: Class "Orchestra\Testbench\TestCase" not found in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\laravel\ui\tests\AuthBackend\RegistersUsersTest.php:17 Stack trace: #0 {main} thrown in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\laravel\ui\tests\AuthBackend\RegistersUsersTest.php on line 17