Fatal error: Uncaught Error: Class "Orchestra\Testbench\TestCase" not found in /opt/lampp/htdocs/intisolve/vendor/laravel/ui/tests/AuthBackend/RegistersUsersTest.php:18 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/intisolve/vendor/laravel/ui/tests/AuthBackend/RegistersUsersTest.php on line 18