public void AddTwoNumbersReturnsExpectedSum()
        {
            var expected = 31;

            var actual = SumHelper.AddTwoNumbers(10, 21);

            Assert.Equal(expected, actual);
        }
        public void AddTwoNumbersOverflowsIfNumbersAreMaxValue()
        {
            var expected = -2;

            var actual = SumHelper.AddTwoNumbers(int.MaxValue, int.MaxValue);

            Assert.Equal(expected, actual);
        }