4^th Homework

Goal of this this homework is to implement partial FizzBuzz using TDD (Test Driven Development).

Deadline: Wednesday 16/12/2020 - 23:59:59

If you have any problems contact your teacher using MS Teams: Tomas Horacek (@hort19).

Specification for FizzBuzz:

fizzBuzz is a function:
- it takes number as an argument
- it returns value based on provided number
fizzBuzz follows these rules:
1. if the number is divisible by 3 it returns "Fizz",
2. if the number is divisible by 5 it returns "Buzz",
3. if the number is divisible by 3 and 5 (e.g. 15) it returns "FizzBuzz",
4. else, it returns the number.

Example inputs and return values:

(it works with 5 too 😉)

Start by crating following file: frontend/src/utils/__tests__/fizzbuzz.js

With this content:

Run yarn test to start TDD cycle.

edit frontend/src/utils/__tests__/fizzbuzz.js
fix failing test (expect(fizzBuzz(3)).toBe('Fizz'))
by implementing functionality in function fizzBuzz(x) { ... }
- remember to use small steps
- implement only what tests will "drive" you to do
step by step write at least:
- two tests for "Fizz" (rule 1.),
- two tests for "Buzz" (rule 2.),
- and two tests for "it returns the number" (rule 4.)
- (no need for rule 3., but if you like you can do it too 😉)
use TDD cycle:
1. write new failing test
2. fix the test
  - as fast as possible
  - don't be afraid to use "stupid" implementations,
  - you can refactor later, when tests are passing
3. refactor
4. repeat
final implementation of fizzBuzz should work correctly for numbers
from 1 to 12

you can see example of TDD Unit Tests for Game of Life here:

Once you have finished (at least two tests for each rule 1., 2. and 4.; and works correctly for numbers from 1 to 12)

send a content of fizzbuzz.js file using MS Teams chat to:
Tomas Horacek (@hort19)
- it should include fizzBuzz function and Unit Tests

Deadline: Wednesday 16/12/2020 - 23:59:59