public void Buy_CannotGiveChange()
{
IVendingMachine vm = SampleVendingMachine_LimitedFloat();
Money tendered = new Money();
tendered.Add(DenominationEnum.TwoEuro, 2);
decimal expectedFloatAfterSale = vm.getFloat().Total;
decimal expectedChange = tendered.Total - fanta.Price;
ProductAndChange pac = vm.buy(fanta.Name, tendered);
Assert.IsNotNull(pac);
Assert.AreEqual(ResultEnum.NoChange, pac.Result, "Result incorrect. Product expected.");
Assert.IsFalse(String.IsNullOrEmpty(pac.Message), "Message incorrect. Message expected.");
Assert.AreEqual(1, vm.countProduct(fanta.Name), "Product quantity not decremented after sale.");
Assert.AreEqual(expectedFloatAfterSale, vm.getFloat().Total, "The money in the machine after the sale is incorrect.");
}
public void Buy_NoChangeRequired()
{
IVendingMachine vm = SampleVendingMachine_FullFloat();
//23 x 10cents
Money tendered = new Money();
tendered.Add(DenominationEnum.TenCents, 23);
decimal expectedFloatAfterSale = vm.getFloat().Total + fanta.Price;
ProductAndChange pac = vm.buy(fanta.Name, tendered);
Assert.IsNotNull(pac);
Assert.AreEqual(ResultEnum.Ok, pac.Result, "Result incorrect. Product expected.");
Assert.IsTrue(String.IsNullOrEmpty(pac.Message), "Message incorrect. No message expected.");
Assert.AreEqual(fanta, pac.Product, "Product incorrect. Fanta expected.");
Assert.AreEqual(0.0M, pac.Change.Total, "Change incorrect.");
Assert.AreEqual(0, vm.countProduct(fanta.Name), "Product quantity incorrect. Product quantity not decremented after sale.");
Assert.AreEqual(expectedFloatAfterSale, vm.getFloat().Total, "Float incorrect. The float after the sale is incorrect.");
}
