Fatal error: Uncaught Error: Class "Illuminate\Foundation\Testing\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\laravel\framework\tests\Foundation\Testing\BootTraitsTest.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\laravel\framework\tests\Foundation\Testing\BootTraitsTest.php on line 26