Sample IO.select

io_select_spec.rb

# coding: utf-8

require 'socket'

describe IO do
  describe 'memo' do
    before do
      @test = nil
      Thread.new { @test = "test" }.join
    end
    it { @test.should == "test" }
  end

  describe '#select(readers, writers, expects, timer)' do
    before do
      udp1 = UDPSocket.open()
      udp2 = UDPSocket.open()
      udp = UDPSocket.open()
      udp1.bind('0.0.0.0', 10000)
      udp2.bind('0.0.0.0', 10001)
      @readers = [udp1, udp2]
      @writers = []
      @expects = nil
      # 待ち受け時間
      @timer = 3

      @write_socket = Socket.pack_sockaddr_in(10000, '0.0.0.0')
      @write_socket_1 = Socket.pack_sockaddr_in(10001, '0.0.0.0')
      udp.send('Bowbow!', 0, @write_socket)
      udp.send('Pochi', 0, @write_socket_1)
      udp.close
    end

    context 'when send packet' do
      subject { select(@readers) }
      it { should be_instance_of(Array) }
    end

    context 'when send two packets' do
      subject { select(@readers)[0] }
      its(:size) { should == 2 }
    end

    describe 'read packet' do
      subject { select(@readers)[0][0] }
      it { should be_instance_of(UDPSocket) }
      it { subject.recvfrom(10).should be_include('Bowbow!') }
    end

    after do
      @readers.each { |s| s.close }
    end
  end
end