public void CheckCardIsInValid()
        {
            ICard card;

            card = new MasterCard("5555555555555555", 5500m, 4322, new DateTime(1995, 10, 5));

            Assert.IsFalse(card.CheckCardValidity());
        }
        public void CheckChardIsValidTheSameDayAsExpiry()
        {
            ICard card;

            card = new MasterCard("5555555555555555", 5500m, 4322, DateTime.Today);

            Assert.IsTrue(card.CheckCardValidity());
        }
        public void CheckCardIsValid()
        {
            ICard card;

            card = new MasterCard("5555555555555555", 5500m, 4322, new DateTime(2030, 10, 5));

            Assert.IsTrue(card.CheckCardValidity());
        }