socket-specs.rb

require 'socket'

module SocketSpecs
  # helper to get the hostname associated to 127.0.0.1
  def self.hostname
    # Calculate each time, without caching, since the result might
    # depend on things like do_not_reverse_lookup mode, which is
    # changing from test to test
    Socket.getaddrinfo("127.0.0.1", nil)[0][2]
  end

  def self.hostnamev6
    Socket.getaddrinfo("::1", nil)[0][2]
  end
  
  def self.port
    40001
  end
  
  def self.str_port
    "40001"
  end

  def self.sockaddr_in(port, host)
    Socket::SockAddr_In.new(Socket.sockaddr_in(port, host))
  end

  def self.socket_path
    tmp("unix_server_spec.socket", false)
  end
end

udp-test.rb

#!/usr/bin/ruby -wKu
# vim: set fileencoding=utf-8 :
require 'socket-specs' #same as spec/ruby/library/socket/fixtures/classes.rb

describe "UDPSocket.bind" do

  before :each do
    @socket = UDPSocket.new
  end

  after :each do
    @socket.close unless @socket.closed?
  end

  it "binds the socket to a port" do
    @socket.bind(SocketSpecs.hostname, SocketSpecs.port)

    lambda { @socket.bind(SocketSpecs.hostname, SocketSpecs.port) }.should raise_error
  end

  it "receives a hostname and a port" do
    @socket.bind(SocketSpecs.hostname, SocketSpecs.port)

    port, host = Socket.unpack_sockaddr_in(@socket.getsockname)

    host.should == "127.0.0.1"
    port.should == SocketSpecs.port
  end

  it "binds to INADDR_ANY if the hostname is empty" do
    @socket.bind("", SocketSpecs.port)
    port, host = Socket.unpack_sockaddr_in(@socket.getsockname)
    host.should == "0.0.0.0"
  end
end