- 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.
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Create a simple String calculator with a method int Add(string numbers).
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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”.
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Start with the simplest test case of an empty string and move to 1 and two numbers.
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Remember to solve things as simply as possible so that you force yourself to write tests you did not think about.
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Remember to refactor after each passing test.
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Allow the Add method to handle an unknown amount of numbers.
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Allow the Add method to handle new lines between numbers (instead of commas).
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the following input is ok: “1\n2,3” (will equal 6).
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the following input is NOT ok: “1,\n” (not need to prove it - just clarifying).
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Support different delimiters.
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to change a delimiter, the beginning of the string will contain a separate line that looks like this: “//[delimiter]\n[numbers…]”. For example “//;\n1;2” should return three where the default delimiter is ‘;’.
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the first line is optional. All existing scenarios should still be supported.
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Calling Add with a negative number will throw an exception “negatives not allowed” - and the negative that was passed. If there are multiple negatives, show all of them in the exception message.
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Numbers bigger than 1000 should be ignored, so adding 2 + 1001 = 2.