mock_socket.rb

class MockSocket
  def self.pipe
    socket1, socket2 = new, new
    socket1.in, socket2.out = IO.pipe
    socket2.in, socket1.out = IO.pipe
    [socket1, socket2]
  end

  attr_accessor :in, :out
  def gets() @in.gets end
  def puts(m) @out.puts(m) end
  def eof?() @in.eof? end
  def empty?
    begin
      @in.read_nonblock(1)
      false
    rescue Errno::EAGAIN
      true
    end
  end
end

@socket, @server = MockSocket.pipe