public void GoldCardMayHaveNegativeCredit()
{
int cardId = 1;
string name = "Customer1";
string address = "Address1";
string city = "City1";
decimal credit = 100;
decimal toPay = credit + 1000;
decimal discount = 10;
GoldCard card = new GoldCard(cardId, name, address, city, credit, discount);
card.Pay(toPay);
Assert.IsTrue(card.Credit < 0);
}
public void GoldCard_WhenPaying_DiscountIsConsidered()
{
int cardId = 1;
string name = "Customer1";
string address = "Address1";
string city = "City1";
decimal credit = 100;
decimal toPay = 10;
decimal discount = 10;
decimal expectedToPay = toPay - (toPay * discount / 100);
decimal expectedCredit = credit - expectedToPay;
GoldCard card = new GoldCard(cardId, name, address, city, credit, discount);
card.Pay(toPay);
Assert.AreEqual(expectedCredit, card.Credit);
}