michael@0: var gNotifications = 0;
michael@0: 
michael@0: var observer = {
michael@0:   QueryInterface: function(iid) {
michael@0:     if (Ci.nsIPrivacyTransitionObserver.equals(iid) ||
michael@0:         Ci.nsISupportsWeakReference.equals(iid) ||
michael@0:         Ci.nsISupports.equals(iid))
michael@0:       return this;
michael@0:     throw Cr.NS_ERROR_NO_INTERFACE;
michael@0:   },
michael@0:   
michael@0:   privateModeChanged: function(enabled) {
michael@0:     gNotifications++;
michael@0:   }
michael@0: }
michael@0: 
michael@0: function run_test() {
michael@0:   var docshell = Cc["@mozilla.org/docshell;1"].createInstance(Ci.nsIDocShell);
michael@0:   docshell.addWeakPrivacyTransitionObserver(observer);
michael@0:   docshell.QueryInterface(Ci.nsILoadContext).usePrivateBrowsing = true;
michael@0:   docshell.QueryInterface(Ci.nsILoadContext).usePrivateBrowsing = false;
michael@0:   do_check_eq(gNotifications, 2);
michael@0: }