Fatal error: Uncaught Error: Class "Illuminate\Tests\Integration\Queue\QueueTestCase" not found in C:\xampp\htdocs\vendor\laravel\framework\tests\Integration\Queue\UniqueJobTest.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\laravel\framework\tests\Integration\Queue\UniqueJobTest.php on line 18