FizzBuzz Kata

Implement the FizzBuzz kata to gain familiarity with the basics of the TDD approach.

We’ll start practicing with the TDD approach. In this group of lessons, we’ll build a kata by following this technique. The example kata we are using is the FizzBuzzkata.
Before starting, let’s review its rules. The FizzBuzz function accepts an integer as a parameter, and it returns a string. The latter depends on the following conditions:

  • If the number is divisible by three, it returns Fizz.
  • If the number is divisible by five, it returns Buzz.
  • If the number is divisible by three and five, it returns FizzBuzz.
  • If the number is neither divisible by three nor by five, it returns a string representation of that number.

In this kata, it’s clear that we have four requirements (or features) to implement. By implementing each of them with the TDD technique, we’ll gain familiarity with this approach and be ready to deal with more complex projects.

The basic scenario

The TDD approach forces us to think about the most basic subset of the problem. After solving it, we can move on and build other features. To build every feature, we have to go through all of the stages of the TDD which are Red, Green, and Refactor.

The Red phase

Let’s see what our starting point looks like:

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