public void Test2()
        {
            var itemA    = _productService.GetBySku("A");
            int quantity = 2;

            var itemB     = _productService.GetBySku("C");
            int quantityB = 2;

            _shoppingBasket.AddToBasket(itemA, quantity);
            _shoppingBasket.AddToBasket(itemB, quantityB);

            var result = _shoppingBasket.GetBasket().ToList();

            result.Count().Should().Be(2);

            var total = _shoppingBasket.TotalPrice();

            total.Should().Be(100m);
        }