Fatal error: Uncaught Error: Class "Tests\TestCase" not found in C:\xampp\htdocs\vendor\qirolab\laravel-themer\stubs\tests\Feature\AuthenticationTest.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\qirolab\laravel-themer\stubs\tests\Feature\AuthenticationTest.php on line 9