* Try not to read ahead.
* Do one task at a time. The trick is to learn to work incrementally.
* Make sure you only test for correct inputs. there is no need to test for invalid inputs for this kata
* Create a simple String calculator with a method int Add(string numbers)
* The method can take 0, 1 or 2 numbers, and will return their sum (for an empty string it will return 0) for example “” or “1” or “1,2”
* Start with the simplest test case of an empty string and move to 1 and two numbers
* Remember to solve things as simply as possible so that you force yourself to write tests you did not think about
* Remember to refactor after each passing test
* Allow the Add method to handle an unknown amount of numbers
* Allow the Add method to handle new lines between numbers (instead of commas).
* the following input is ok: “1\n2,3” (will equal 6)
* the following input is NOT ok: “1,\n” (not need to prove it - just clarifying)