Source: http://osherove.com/tdd-kata-1
- 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
- The method can take 0, 1 or 2 numbers, and will return their sum (for an empty string it will return 0) for example
- 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)
- the following input is ok:
- 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
- to change a delimiter, the beginning of the string will contain a separate line that looks like this:
- 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.
stop here if you are a beginner. Continue if you can finish the steps so far in less than 30 minutes.
- Numbers bigger than 1000 should be ignored, so adding 2 + 1001 = 2
- Delimiters can be of any length with the following format:
//[delimiter]\n
for example://[***]\n1***2***3
should return 6 - Allow multiple delimiters like this:
//[delim1][delim2]\n
for example//[*][%]\n1*2%3
should return 6. - make sure you can also handle multiple delimiters with length longer than one char