def METHOD_NAME(self, key_to_delete):
    test_data = deepcopy(self.request_data)
    _ = test_data.pop(key_to_delete)
    response = self.request_without_auth(
        'post',
        self.url,
        data=json.dumps(test_data),
        content_type='application/json'
    )
    self.assertHttpBadRequest(response)