diff -r 000000000000 -r 6474c204b198 toolkit/components/places/tests/expiration/test_notifications.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/places/tests/expiration/test_notifications.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * What this is aimed to test:
+ *
+ * Ensure that History (through category cache) notifies us just once.
+ */
+
+let os = Cc["@mozilla.org/observer-service;1"].
+         getService(Ci.nsIObserverService);
+let hs = Cc["@mozilla.org/browser/nav-history-service;1"].
+         getService(Ci.nsINavHistoryService);
+
+let gObserver = {
+  notifications: 0,
+  observe: function(aSubject, aTopic, aData) {
+    this.notifications++;
+  }
+};
+os.addObserver(gObserver, PlacesUtils.TOPIC_EXPIRATION_FINISHED, false);
+
+function run_test() {
+  // Set interval to a large value so we don't expire on it.
+  setInterval(3600); // 1h
+
+  hs.QueryInterface(Ci.nsIBrowserHistory).removeAllPages();
+
+  do_timeout(2000, check_result);
+  do_test_pending();
+}
+
+function check_result() {
+  os.removeObserver(gObserver, PlacesUtils.TOPIC_EXPIRATION_FINISHED);
+  do_check_eq(gObserver.notifications, 1);
+  do_test_finished();
+}