diff -r 000000000000 -r 6474c204b198 toolkit/components/places/tests/expiration/test_idle_daily.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/places/tests/expiration/test_idle_daily.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that expiration runs on idle-daily.
+
+function run_test() {
+  do_test_pending();
+
+  // Set interval to a large value so we don't expire on it.
+  setInterval(3600); // 1h
+
+  Services.obs.addObserver(function observeExpiration(aSubject, aTopic, aData) {
+    Services.obs.removeObserver(observeExpiration,
+                                PlacesUtils.TOPIC_EXPIRATION_FINISHED);
+    do_test_finished();
+  }, PlacesUtils.TOPIC_EXPIRATION_FINISHED, false);
+
+  let expire = Cc["@mozilla.org/places/expiration;1"].
+               getService(Ci.nsIObserver);
+  expire.observe(null, "idle-daily", null);
+}