Ruby

TCPServer.open("0.0.0.0", 0) {|serv|

serv_ai = Addrinfo.new(serv.getsockname, :INET, :STREAM)

serv_ai = tcp_unspecified_to_loopback(serv_ai)

port = random_port

begin

serv_ai.connect_from(Addrinfo.tcp("0.0.0.0", port)) {|s1|

s2 = serv.accept

begin

assert_equal(port, s2.remote_address.ip_port)

ensure

s2.close

end

}

rescue *errors_addrinuse

# not test failure

end

}