FizzBuzz

buzz.rb

class FizzBuzz


  def self.play(array)
    array.collect do | num |
      self.fizzbuzz(num) || self.buzz(num) || self.fizz(num) || num
    end
  end

  def self.fizz(n)
    'fizz' if n % 3 == 0
  end

  def self.buzz(n)
    'buzz' if n % 5 == 0
  end

  def self.fizzbuzz(n)
    'fizzbuzz' if n % 5 == 0 && n % 3 == 0
  end

end

buzz_spec.rb

require 'minitest/autorun'
require 'minitest/pride'
require './buzz'

describe FizzBuzz do

  describe '#play' do

    it 'should take an array and return FizzBuzz' do
      result = FizzBuzz.play([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15])

      result.must_equal [1, 2, 'fizz', 4, 'buzz', 'fizz', 7, 8, 'fizz', 'buzz', 11, 'fizz', 13, 14, 'fizzbuzz']

    end
  end

  describe '#fizz' do

    it 'returns fizz when divisable by 3' do
      result = FizzBuzz.fizz(3)

      result.must_equal 'fizz'
    end

    it 'returns fizz when divisable by 3' do
      result = FizzBuzz.fizz(2)

      result.must_equal nil
    end
  end

  describe '#buzz' do 

    it 'returns buzz when divisable by 5' do
      result = FizzBuzz.buzz(5)

      result.must_equal 'buzz'
    end

    it 'does not return buzz when it is not divisible by 5' do
      result = FizzBuzz.buzz(7)

      result.must_equal nil
    end
  end
  describe '#fizzbuzz' do

    it 'returns fizzbuzz when it is divisable by 5 and divisible by 3' do
      result = FizzBuzz.fizzbuzz(15)

      result.must_equal 'fizzbuzz'
    end
  end
end