Fatal error: Uncaught Error: Class "Tests\TestCase" not found in C:\xampp\htdocs\vistas_piter\vendor\php-mqtt\client\tests\Feature\PublishSubscribeTest.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vistas_piter\vendor\php-mqtt\client\tests\Feature\PublishSubscribeTest.php on line 19