Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\laravel\framework\tests\Support\SupportCapsuleManagerTraitTest.php:12 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\laravel\framework\tests\Support\SupportCapsuleManagerTraitTest.php on line 12