def METHOD_NAME(self):
    form = UpdatePersonForm(
        {
            "name": "John Doe",
            "source": "Just testing...",
            "standing_2015": "standing",
            "constituency_2015": "65808",
        },
        initial={"person": self.person},
    )
    self.assertFalse(form.is_valid())
    self.assertEqual(
        form.errors,
        {
            "__all__": [
                "You must specify a party for the 2015 General Election"
            ]
        },
    )