'The methods of a custom QuerySet are properly copied onto the
default Manager.'

def test_queryset_copied_to_default(self):

    for manager_name in self.custom_manager_names:
        with self.subTest(manager_name=manager_name):
            manager = getattr(Person, manager_name)
            manager.public_method()
            with self.assertRaises(AttributeError):
                manager._private_method()
