The FizzBuzz kata

readme.md

The FizzBuzz Kata

- Write a program that prints the numbers from 1 to 100. But for multiples of three print "Fizz"
  instead of the number and for the multiples of five print "Buzz". For numbers which are multiples of both
  three and five print "FizzBuzz".

app.rb

require './fizzbuzz'

fizzbuzz = FizzBuzz.new
(1..100).each { |number| puts fizzbuzz.print_number(number) }

fizzbuzz.rb

class FizzBuzz
  def print_number(number)
    # Write your code here 
  end
end

fizzbuzz_spec.rb

require './fizzbuzz'

RSpec.describe FizzBuzz do
  subject { described_class.new }

  describe '#print_number' do
    context 'when the number is multiple of 3' do
      it 'returns "FIZZ"' do
        [3, 6, 9, 12, 18].each do |number|
          expect(subject.print_number(number)).to eq 'FIZZ'
        end
      end
    end

    context 'when the number is multiple of 5' do
      it 'returns "BUZZ"' do
        [5, 10, 20, 25].each do |number|
          expect(subject.print_number(number)).to eq 'BUZZ'
        end
      end
    end

    context 'when the number is multiple of both 3 and 5' do
      it 'returns "FIZZBUZZ"' do
        [15, 30, 45, 60].each do |number|
          expect(subject.print_number(number)).to eq 'FIZZBUZZ'
        end
      end
    end

    context 'when the number is not multiple of 3 or 5' do
      it 'returns the same number' do
        [1, 2, 4, 7, 11].each do |number|
          expect(subject.print_number(number)).to eq number
        end
      end
    end
  end
end