Test-Driven React

Example Fizz Buzz Solution

ch1/index.test.js

const fizzBuzz = require('./index');

describe('fizzBuzz()', () => {
  it('returns "FizzBuzz" for multiples of 3 and 5', () => {
    expect(fizzBuzz(15)).toBe('FizzBuzz');
    expect(fizzBuzz(30)).toBe('FizzBuzz');
  });

  it('returns "Fizz" for multiples of 3', () => {
    expect(fizzBuzz(3)).toBe('Fizz');
    expect(fizzBuzz(33)).toBe('Fizz');
  });

  it('returns "Buzz" for multiples of 5', () => {
    expect(fizzBuzz(5)).toBe('Buzz');
    expect(fizzBuzz(20)).toBe('Buzz');
  });

  it('returns the given number for multiples of neither 3 nor 5', () => {
    expect(fizzBuzz(1)).toBe('1');
    expect(fizzBuzz(22)).toBe('22');
  });
});

ch1/index.js

module.exports = (num) => { ...