Fatal error: Uncaught Error: Class "Tests\TestCase" not found in C:\xampp\htdocs\smsgateway2\tests\Feature\Messaging\OutboxPublisherServiceTest.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\smsgateway2\tests\Feature\Messaging\OutboxPublisherServiceTest.php on line 18