public void should_handle_new_line_separator()
        {
            //arrange
            var calc = new StringCalculator();

            //act
            var result = calc.Add("1\n2,3");

            //assert
            result.ShouldBeEquivalentTo(6);
        }
        public void should_return_zero_for_empty_string()
        {
            //arrange
            var calc = new StringCalculator();

            //act
            var result = calc.Add("");

            //assert
            result.ShouldBeEquivalentTo(0);
        }
        public void should_handle_one_digit()
        {
            //arrange
            var calc = new StringCalculator();
            var d = new Random().Next(10);

            //act
            var result = calc.Add(d.ToString());

            //assert
            result.ShouldBeEquivalentTo(d);
        }
        public void should_add_two_random_digits()
        {
            //arrange
            var calc = new StringCalculator();
            var one = new Random().Next(10);
            var two = new Random().Next(10);

            //act
            var result = calc.Add(one + "," + two);

            //assert
            result.ShouldBeEquivalentTo(one + two);
        }
        public void should_handle_unknown_amount_of_digits()
        {
            //arrange
            var calc = new StringCalculator();
            var count = new Random().Next(10);

            var digiList = new List<int>();
            for (int i = 0; i < count; i++)
            {
                digiList.Add(new Random().Next(10));
            }
            
            //act
            var result = calc.Add(String.Join(",", digiList));

            //assert
            result.ShouldBeEquivalentTo(digiList.Sum()); 
        }
 public void Test1()
 {
     StringCalculator sut = new StringCalculator();
 }