Fatal error: Uncaught Error: Class "Illuminate\Foundation\Testing\TestCase" not found in C:\xampp\htdocs\r10csm\vendor\laravel\framework\tests\Integration\Queue\CustomPayloadTest.php:12 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10csm\vendor\laravel\framework\tests\Integration\Queue\CustomPayloadTest.php on line 12