TDD Boot Camp 福岡

fizzbuzz.rb

#-*- coding: utf-8 -*-

class FizzBuzz
  def fizzbuzz(num)
    return "FizzBuzz" if num % 15 == 0
    return "Buzz" if num % 5 == 0
    return "Fizz" if num % 3 == 0
    num.to_s
  end

  def fizzbuzz_range(range)
    range.map do |num|
      fizzbuzz(num)
    end
  end
end

if $0 == __FILE__
  fizzbuzz = FizzBuzz.new
  100.times do |i|
    puts "#{i}: #{fizzbuzz.fizzbuzz(i)}"
  end
end

fizzbuzz_spec.rb

#-*- coding: utf-8 -*-

require "rubygems"
require "rspec"
require "./fizzbuzz"

describe FizzBuzz, "fizzbuzz" do
  before :each do
    @fizzbuzz = FizzBuzz.new
  end
   

  it "3の倍数のときにFizzを返すこと" do
    @fizzbuzz.fizzbuzz(3).should == "Fizz"
  end
  it "5の倍数のときにBuzzを返すこと" do
    @fizzbuzz.fizzbuzz(5).should == "Buzz"
  end
  it "15の倍数ときにBuzzを返すこと" do
    @fizzbuzz.fizzbuzz(15).should == "FizzBuzz"
    @fizzbuzz.fizzbuzz(45).should == "FizzBuzz"
  end
  it "0が与えられたときにFizzBuzzを返すこと" do
    @fizzbuzz.fizzbuzz(0).should == "FizzBuzz"
  end
  it "2が与えられたとき2を返すこと" do
    @fizzbuzz.fizzbuzz(2).should == "2"
  end
end

describe FizzBuzz, "fizzbuzz_range" do
  before :each do
    @fizzbuzz = FizzBuzz.new
  end

  it "1から2までを与えたとき、1, 2が文字列で返ってくること" do
    @fizzbuzz.fizzbuzz_range((1..2)).should == ["1", "2"]
  end

  it "1から5までを与えたとき、[1,2,Fizz,4,Buzz]が文字列で返ってくること" do
    [1..5].class.should == Array
    @fizzbuzz.fizzbuzz_range((1..5)).should == ["1", "2", "Fizz", "4", "Buzz"]
  end
end