def METHOD_NAME(self):
    zaak = ZaakFactory()
    zaak_url = reverse(zaak)
    response = self.client.post(
        self.list_url,
        {
            "zaak": f"http://testserver{zaak_url}",
            "resultaattype": "abcd",
            "toelichting": "some desc",
        },
    )
    self.assertEqual(
        response.status_code, status.HTTP_400_BAD_REQUEST, response.data
    )
    error = get_validation_errors(response, "resultaattype")
    self.assertEqual(error["code"], "bad-url")