/// <summary>
/// Accept the payment already inserted and then dispense the change. Dispense amount can't be greater than paymentAmount.
///
/// Note: The accept and payment is in one method call to prevent change being dispense without accepting the payment first :)
/// </summary>
/// <param name="change">The change to return.</param>
/// <returns>True if success. Else false.</returns>
public bool TryAcceptPaymentAndDispenseChange(int change)
{
if (change > PaymentAmount)
{
_logger.LogError("Cannot return change that is more than the payment amount.");
return(false);
}
var coinsToReturn = _coinReturnAlgorithm.Calculate(_coinInventory, change);
if (coinsToReturn == null)
{
_logger.LogError("Change required is not possible using coins in current inventory.");
return(false);
}
return(TryAcceptPayment() ? (TryDispenseChange(coinsToReturn) ? true : false) : false);
}
public void Calculate_CoinInventoryIsNull_ThrowArgumentNullException()
{
Assert.Throws <ArgumentNullException>(() => algorithm.Calculate(null, 10));
}