public void ConvertStringToInt(string enteredString, int number)
        {
            IProcessString processString = new ProcessString();

            var resultNumber = processString.ConvertStringToInt(enteredString);

            Assert.AreEqual(number, resultNumber);
        }
        public void ExceptionShouldArise()
        {
            try
            {
                string         enteredString = "fdgdg";
                IProcessString processString = new ProcessString();

                var resultNumber = processString.ConvertStringToInt(enteredString);

                Assert.Fail("no exception thrown");
            }
            catch (StringCanNotBeConvertedToInt ex)
            {
                Assert.IsTrue(ex is StringCanNotBeConvertedToInt);
            }
        }