The Tor Browser / file revision

 var rawData = new Uint8Array([65,66,67,68]);

 var data = String.fromCharCode.apply(null, rawData);

 function UDPSocketListener(){}

 UDPSocketListener.prototype = {

   QueryInterface : XPCOMUtils.generateQI([Ci.nsIUDPSocketListener]),

   onPacketReceived : function(aSocket, aMessage){

     var mData = String.fromCharCode.apply(null, aMessage.rawData);

     do_check_eq(mData, data);

     do_check_eq(mData, aMessage.data);

     do_test_finished();

   },

   onStopListening: function(aSocket, aStatus){}

 };

 function run_test(){

   var socket = Cc["@mozilla.org/network/udp-socket;1"].createInstance(Ci.nsIUDPSocket);

   socket.init(-1, true);

   do_print("Port assigned : " + socket.port);

   socket.asyncListen(new UDPSocketListener());

   var written = socket.send("127.0.0.1", socket.port, rawData, rawData.length);

   do_check_eq(written, data.length);

   do_test_pending();

 }