cyber-dojo.org - FizzBuzz

fizz_buzz.rb

require "rspec/autorun" 

class FizzBuzz
  def call
  end
end

describe FizzBuzz do 
  let(:subject) { FizzBuzz.new }

  describe "call" do
    let(:output) { subject.call }  

    it "returns an array" do 
      expect(output).to be_an Array
    end

    it "returns an array of length 100" do 
      expect(output.length).to eq 100
    end
    
    it "returns 1 as the first value" do 
      expect(output[0]).to eq 1
    end
    
    it "returns 'Fizz' on multiples of 3" do
      expect(output[2]).to eq 'Fizz'
      expect(output[5]).to eq 'Fizz'
      expect(output[8]).to eq 'Fizz'
    end
    
    it "returns 'Buzz' on multiples of 5" do 
      expect(output[4]).to eq "Buzz"
      expect(output[9]).to eq "Buzz"
      expect(output[19]).to eq "Buzz"
    end
    
    it "returns 'FizzBuzz' on multiples of 5 and 3" do 
      expect(output[14]).to eq "FizzBuzz"
      expect(output[29]).to eq "FizzBuzz"
      expect(output[44]).to eq "FizzBuzz"
    end
  end
end