public void ZeroAmount()
        {
            UtilityLib obj = new UtilityLib();

            try
            {
                obj.calculateDiscount(0);
            }
            catch (Exception e) { }
        }
        public void TwoThousand()
        {
            UtilityLib obj = new UtilityLib();

            Assert.AreNotEqual(1900, obj.calculateDiscount(2000));
        }
        public void OneThousand()
        {
            UtilityLib obj = new UtilityLib();

            Assert.AreNotEqual(930, obj.calculateDiscount(1000));
        }
        public void OneThousand_Below()
        {
            UtilityLib obj = new UtilityLib();

            Assert.AreEqual(999, obj.calculateDiscount(999));
        }
        public void FiveThousand_G_E()
        {
            UtilityLib obj = new UtilityLib();

            Assert.AreEqual(2500, obj.calculateDiscount(5000));
        }