public void Get_Amount_Of_Item_You_Can_Purchase_With_Given_Money(int initialAmount, decimal givenMoney, int purchasableAmount)
        {
            ICatalogueItem item = new SimpleCatalogueItem();

            for (int i = 0; i < initialAmount; i++)
            {
                IItem fakeItem = new FakeItem1();
                item.Add(fakeItem);
            }
            Assert.That(purchasableAmount.Equals(item.GetTotalNumberForAGivenPrice(givenMoney)));
        }