michael@0: const Ci = Components.interfaces;
michael@0: const Cc = Components.classes;
michael@0: 
michael@0: let pb = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);
michael@0: 
michael@0: // This pref is chosen somewhat arbitrarily --- we just need one
michael@0: // that's guaranteed to have a default value.
michael@0: const kPrefName = 'intl.accept_languages'; // of type char, which we
michael@0:                                            // assume below
michael@0: let initialValue = null;
michael@0: 
michael@0: function check_child_pref_info_eq(continuation) {
michael@0:     sendCommand(
michael@0:         'var pb = Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefBranch);\n'+
michael@0:         // Returns concatenation "[value],[isUser]"
michael@0:         'pb.getCharPref("'+ kPrefName +'")+ "," +'+
michael@0:         'pb.prefHasUserValue("'+ kPrefName +'");',
michael@0:         function (info) {
michael@0:             let [ value, isUser ] = info.split(',');
michael@0:             do_check_eq(pb.getCharPref(kPrefName), value);
michael@0:             do_check_eq(pb.prefHasUserValue(kPrefName), isUser == "true");
michael@0:             continuation();
michael@0:         });
michael@0: }
michael@0: 
michael@0: function run_test() {
michael@0:     // We finish in clean_up()
michael@0:     do_test_pending();
michael@0: 
michael@0:     try {
michael@0:         if (pb.getCharPref('dom.ipc.processPrelaunch.enabled')) {
michael@0:             dump('WARNING: Content process may already have launched, so this test may not be meaningful.');
michael@0:         }
michael@0:     } catch(e) { }
michael@0: 
michael@0:     initialValue = pb.getCharPref(kPrefName);
michael@0: 
michael@0:     test_user_setting();
michael@0: }
michael@0: 
michael@0: function test_user_setting() {
michael@0:     // We rely on setting this before the content process starts up.
michael@0:     // When it starts up, it should recognize this as a user pref, not
michael@0:     // a default pref.
michael@0:     pb.setCharPref(kPrefName, 'i-imaginarylanguage');
michael@0:     // NB: processing of the value-change notification in the child
michael@0:     // process triggered by the above set happens-before the remaining
michael@0:     // code here
michael@0:     check_child_pref_info_eq(function () {
michael@0:             do_check_eq(pb.prefHasUserValue(kPrefName), true);
michael@0: 
michael@0:             test_cleared_is_default();
michael@0:         });
michael@0: }
michael@0: 
michael@0: function test_cleared_is_default() {
michael@0:     pb.clearUserPref(kPrefName);
michael@0:     // NB: processing of the value-change notification in the child
michael@0:     // process triggered by the above set happens-before the remaining
michael@0:     // code here
michael@0:     check_child_pref_info_eq(function () {
michael@0:             do_check_eq(pb.prefHasUserValue(kPrefName), false);
michael@0: 
michael@0:             clean_up();
michael@0:         });
michael@0: }
michael@0: 
michael@0: function clean_up() {
michael@0:     pb.setCharPref(kPrefName, initialValue);
michael@0:     // NB: processing of the value-change notification in the child
michael@0:     // process triggered by the above set happens-before the remaining
michael@0:     // code here
michael@0:     check_child_pref_info_eq(function () {
michael@0:             do_test_finished();
michael@0:         });
michael@0: }