public void TestInitialize()
        {
            _posTerminal = new PointOfSaleTerminal();

            var productA = new Product('A', 1.25);

            _posTerminal.SetPricing(productA);
            _posTerminal.SetHandler(new VolumeHandler(3, 3.00, productA));

            var productB = new Product('B', 4.25);

            _posTerminal.SetPricing(productB);

            var productC = new Product('C', 1.00);

            _posTerminal.SetPricing(productC);
            _posTerminal.SetHandler(new VolumeHandler(6, 5.00, productC));

            var productD = new Product('D', 0.75);

            _posTerminal.SetPricing(productD);

            _posTerminal.SetHandler(new SingleUnitHandler());
        }