public void PurchaseItemsShouldReduceAccountBalance(int valueToAdd, string price, string value, int userQuantity)
{
//Arrange
Accounting accounting = new Accounting();
CateringItem cateringItem = new CateringItem();
accounting.AddMoney(valueToAdd);
decimal expected = decimal.Parse(value);
cateringItem.Price = decimal.Parse(price);
//Act
//decimal result = accounting.SubtractPurchase(cateringItem, userQuantity);
//Assert
//Assert.AreEqual(expected, result);
}