public void Can_CalculateDistanceBetweenGeoMembers()
        {
            redis.FlushDb();
            redis.AddGeoMembers("Sicily",
                                new RedisGeo(13.361389, 38.115556, "Palermo"),
                                new RedisGeo(15.087269, 37.502669, "Catania"));

            var distance = redis.CalculateDistanceBetweenGeoMembers("Sicily", "Palermo", "Catania");

            Assert.That(distance, Is.EqualTo(166274.15156960039).Within(.1));
        }