def METHOD_NAME(self):
    """Verify JSON information is retrieved correctly."""
    response = requests.Response()
    response.headers["Last-Modified"] = "foo"
    response.headers["ETag"] = "bar"
    response.raw = io.BytesIO(b"{}")
    response.status_code = 200
    json = self.instance._json(response, 200)
    assert json["Last-Modified"] == "foo"
    assert json["ETag"] == "bar"