The Tor Browser / file revision

 // This is essentially a crashtest for accessing an out of range port

 // Perform the async open several times in order to induce exponential

 // scheduling behavior bugs.

 const CC = Components.Constructor;

 var counter = 0;

 const iterations = 10;

 var listener = {

   onStartRequest: function test_onStartR(request, ctx) {

   },

   onDataAvailable: function test_ODA() {

     do_throw("Should not get any data!");

   },

   onStopRequest: function test_onStopR(request, ctx, status) {

     if (counter++ == iterations)

       do_test_finished();

     else

       execute_test();

   },

 };

 function run_test() {

   execute_test();

   do_test_pending();

 }

 function execute_test() {

   var ios = Cc["@mozilla.org/network/io-service;1"].

                        getService(Ci.nsIIOService);

   var chan = ios.newChannel("http://localhost:75000", "", null);

   chan.QueryInterface(Ci.nsIHttpChannel);

   chan.asyncOpen(listener, null);

 }