Fatal error: Uncaught Error: Class "Orchestra\Testbench\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\laravel\framework\tests\Support\SupportMailTest.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\laravel\framework\tests\Support\SupportMailTest.php on line 9