def METHOD_NAME(self):
    with patch("karrio.mappers.dicom.proxy.http") as mock:
        mock.return_value = "{}"
        Tracking.fetch(self.TrackingRequest).from_(gateway)
        self.assertEqual(
            mock.call_args[1]["url"],
            f"{gateway.settings.server_url}/v1/tracking/1Z12345E6205277936",
        )