public void editExistingDiscount()
        {
            Boolean check = discountsArchive.editDiscount(1, 50, DateTime.Now.AddMonths(10).ToString());

            Assert.IsTrue(check);
            Discount d = discountsArchive.getDiscount(1);

            Assert.AreEqual(d.Percentage, 50);
            Assert.AreEqual(d.DueDate, DateTime.Now.AddMonths(10).ToString());
        }