public void Test1()
        {
            var itemA    = _productService.GetBySku("A");
            int quantity = 7;

            _shoppingBasket.AddToBasket(itemA, quantity);

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

            result.Count().Should().Be(1);
            result[0].Item.Should().BeEquivalentTo(itemA);
            result[0].Quantity.Should().Be(quantity);
        }