Fatal error: Uncaught Error: Class "Orchestra\Testbench\TestCase" not found in C:\xampp\htdocs\r10ca\vendor\laravel\framework\tests\Integration\Notifications\SendingMailNotificationsTest.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\laravel\framework\tests\Integration\Notifications\SendingMailNotificationsTest.php on line 22