tdd-code-kata

Learning Go through a TDD Code Kata

TDD Kata - String Calculator

Developed by Roy Osherove - http://osherove.com/tdd-kata-1

The goal of this exercise is to see how far you can get in 30 minutes. Write a test before implementing any code. 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

TDD Code Kata

TDD Kata - String Calculator

Developed by Roy Osherove - http://osherove.com/tdd-kata-1

The goal of this exercise is to see how far you can get in 30 minutes. Write a test before implementing any code. 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

Step 1: Create a simple String calculator with a single method: int Add(string numbers)

The method can take 0, 1 or 2 numbers, and will return their sum. For example:

• Add(“”) should return 0
• Add(“2112”) should return 2112
• Add(“2,3”) should return 5

Step 2: Allow the Add method to handle an unknown amount of numbers

Step 3: 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” (no need to prove it - just clarifying)

Step 4: 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 ‘;’
• All existing tests should still be supported

Step 5: 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

Step 6: Numbers bigger than 1000 should be ignored

• Adding 2 + 1001 = 2

Step 7: Delimiters can be of any length with the following format: “//[delimiter]\n”

• For example: “//[***]\n1***2***3” should return 6

Step 8: 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