Fatal error: Uncaught Error: Class 'Tests\TestCase' not found in E:\xampp\htdocs\www\order\qr250\vendor\dcat\laravel-admin\tests\Feature\InstallTest.php:13 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\order\qr250\vendor\dcat\laravel-admin\tests\Feature\InstallTest.php on line 13