Fizz Buzz

fizz_buzz.rb

#! /usr/bin/env ruby
# coding:utf-8

def fizz_buzz(i)
  str = []
  str << "fizz" if (i/3 - (i-1)/3) == 1
  str << "buzz" if (i/5 - (i-1)/5) == 1
  str << i.to_s if str.empty?
  str.join(" ")
end

fizz_buzz.spec

# coding:utf-8
require "rspec"
require "./fizz_buzz.rb"

describe "FizzBuzz" do
	before do
		@fizz_buzz_arr = [ 1,  2,  "fizz", 4,  "buzz", "fizz", 7,  8,  "fizz", "buzz", 11, "fizz", 13, 14, "fizz buzz"] 
	end

	it "3で割り切れる時はfizzを出力する" do
		1000.times do
			a = 1 + rand(1000000)
			a -= a % 3
			fizz_buzz(a).should match /fizz/
		end	
	end

	it "5で割り切れる時はbuzzを出力する" do
		1000.times do
			a = 1 + rand(1000000)
			a -= a % 5
			fizz_buzz(a).should match /buzz/
		end	
	end

	it "Fizz Buzz 列を作れる" do
		10.times do
			a = 1 + rand(1000000)
			a -= a%15 - 1
			puts a
			answer = @fizz_buzz_arr.map{|n| (n.kind_of? Fixnum)? (n+a-1).to_s : n}
			range = (a...a+15)
			arr = range.map{|n| fizz_buzz(n)}
			print 'correct output  '
			p answer
			print 'fizz_buzz output'
			p arr
			arr.should == answer
		end
	end

end