public void DecoratorTestCase()
        {
            IVehicle vehicle = new Saloon(new StandardEngine(1200));
            vehicle.Paint(VehicleColour.Silver);
            //add extras
            vehicle = new AirConditionedVehicle(vehicle);
            vehicle = new AlloyWheeledVehicle(vehicle);
            vehicle = new MetallicPaintedVehicle(vehicle);
            vehicle = new SatNavVehicle(vehicle);

            //Log
            Console.WriteLine(@"Price: {0:C}", vehicle.Price);
            const int totalPrice = 9100;
            Assert.AreEqual(totalPrice, vehicle.Price);
        }