public void TestsSufficientFunds()
{
//arrange
Catering catering = new Catering(fa);
CateringItem[] items = catering.GetInventory();
string code = items[0].ProductCode; //first item
decimal price = items[0].Price;
//act
//how much for 5 of them?
decimal extendedPrice = price * 5;
//add that amount + 1 dollar
int moneyToAdd = (int)Math.Ceiling(extendedPrice) + 1;
catering.AddMoney(moneyToAdd.ToString());
Assert.IsTrue(catering.IsSufficientFunds(code, "5"));
Assert.IsFalse(catering.IsSufficientFunds(code, "10"));
}