public void testDiscountWithZero()
{
double originalBalance = 50;
testCard.extendBalance(originalBalance);
testCard.buyTicket();
double ticketPriceWithoutDiscount = originalBalance - this.testCard.getBalance();
testCard.setDiscount(0);
originalBalance = this.testCard.getBalance();
testCard.buyTicket();
double ticketPriceWithZeroDiscount = originalBalance - this.testCard.getBalance();
Assert.AreEqual(ticketPriceWithoutDiscount, ticketPriceWithZeroDiscount);
Assert.AreNotEqual(ticketPriceWithZeroDiscount, 0);
}
