PHP Fatal [namespace] error for Factory::attributeFor("Model")

[DanCosta88]

I use this code in my Post Model

public function testBasicFactory()
{
    $post = Factory::attributesFor('Post');
}

and when I run phpunit, I got this error:

PHP Fatal error: Class 'App' not found in /var/www/myproject/vendor/way/laravel-test-helpers/src/Way/Tests/Factory.php on line 65