StringCalculator Kata implemented using TDD and Python
From: Roy Osherove
Description:
String Calculator
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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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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). 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)
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Support different delimiters 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 ‘;’ . 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