public void PaymentCard_Credit_ShouldRemoveFundsFromBalance_WhenCredited(int creditAmount)
{
var startingBalance = 1000;
var card = new PaymentCard(startingBalance);
Assert.Equal(startingBalance, card.Balance);
card.Credit(creditAmount);
var newBalance = startingBalance - creditAmount;
Assert.Equal(newBalance, card.Balance);
}
public void PaymentCard_Credit_ShouldThrowException_WhenCardDoesNotHaveSufficientFunds()
{
var card = new PaymentCard();
Assert.Throws <Exception>(() => card.Credit(10));
}