public void Ensure_Latitude_Decrements_By_One_When_Moving_West()
        {
            var latitude  = 5;
            var lawnMower = new LawnMowerModel()
            {
                Direction = Directions.West,
                Position  = new GeoCoordinate(latitude, 5)
            };

            lawnMower = new LawnmowerInstructions().MoveForward(lawnMower);

            Assert.AreEqual(lawnMower.Position.Latitude, latitude -= 1);
        }
        public void Ensure_Longitude_Decrements_By_One_When_Moving_South()
        {
            var longitude = 5;
            var lawnMower = new LawnMowerModel()
            {
                Direction = Directions.South,
                Position  = new GeoCoordinate(2, longitude)
            };

            lawnMower = new LawnmowerInstructions().MoveForward(lawnMower);

            Assert.AreEqual(lawnMower.Position.Longitude, longitude -= 1);
        }