public void Add_GivenOneNumber_ShouldReturnNumber()
        {
            //---------------Set up test pack-------------------
            var calculator = new StringCalculator002();
            //---------------Assert Precondition----------------

            //---------------Execute Test ----------------------
            var result = calculator.Add("1");

            //---------------Test Result -----------------------
            Assert.AreEqual(1, result);
        }
        public void Add_GivenEmptyString_ShouldReturnZero()
        {
            //---------------Set up test pack-------------------
            var calculator = new StringCalculator002();
            //---------------Assert Precondition----------------

            //---------------Execute Test ----------------------
            var result = calculator.Add("");

            //---------------Test Result -----------------------
            Assert.AreEqual(0, result);
        }