Fatal error: Uncaught Error: Class 'Tests\TestCase' not found in /home/diligence/public_html/diligence-sensing/vendor/php-mqtt/client/tests/Feature/PublishSubscribeTest.php:18 Stack trace: #0 {main} thrown in /home/diligence/public_html/diligence-sensing/vendor/php-mqtt/client/tests/Feature/PublishSubscribeTest.php on line 18