public void Add4WithNoNumbersInArgumentTestMethod()
        {
            const string numbers  = "//;\n";
            const int    expected = 0;

            int actual = StringCalculator.Add4(numbers);

            Assert.AreEqual(expected, actual);
        }
        public void Add4TestMethod()
        {
            const string numbers  = "//;\n3;9;4;89;23;12;0";
            const int    expected = 140;

            int actual = StringCalculator.Add4(numbers);

            Assert.AreEqual(expected, actual);
        }