def METHOD_NAME(self, list_type, channels, result_name="channels"):
    self.resp = responses.mock
    self.resp.add(
        method=responses.GET,
        url="https://slack.com/api/%s.list" % list_type,
        status=200,
        content_type="application/json",
        body=json.dumps({"ok": "true", result_name: channels}),
    )