public void IntegerUtils_ToString2Test()
        {
            int?   int1   = null;
            String result = IntegerUtils.ToString(int1);

            Assert.AreEqual("", result);
        }
        public void IntegerUtils_ToString1Test()
        {
            int?   int1   = new int?(1);
            String result = IntegerUtils.ToString(int1);

            Assert.AreEqual("1", result);
        }