Fatal error: Uncaught Error: Class 'Tests\DuskTestCase' not found in E:\xampp\htdocs\www\yunwei\qr2500\vendor\dcat\laravel-admin\tests\TestCase.php:5 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\yunwei\qr2500\vendor\dcat\laravel-admin\tests\TestCase.php on line 5