The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

  * http://creativecommons.org/licenses/publicdomain/  */ 

 // Regression test for bug 345529 - crash removing an observer during an

 // nsPref:changed notification.

 function run_test() {

   const Cc = Components.classes;

   const Ci = Components.interfaces;

   const PREF_NAME = "testPref";

   var prefs = Cc["@mozilla.org/preferences-service;1"]

               .getService(Ci.nsIPrefBranch);

   var observer = {

     QueryInterface: function QueryInterface(aIID) {

       if (aIID.equals(Ci.nsIObserver) ||

           aIID.equals(Ci.nsISupports))

          return this;

       throw Components.results.NS_NOINTERFACE;

     },

     observe: function observe(aSubject, aTopic, aState) {

       prefs.removeObserver(PREF_NAME, observer);

     }

   }

   prefs.addObserver(PREF_NAME, observer, false);

   prefs.setCharPref(PREF_NAME, "test0")

   // This second call isn't needed on a clean profile: it makes sure 

   // the observer gets called even if the pref already had the value

   // "test0" before this test.

   prefs.setCharPref(PREF_NAME, "test1")

   do_check_true(true);

 }