diff -r 000000000000 -r 6474c204b198 webapprt/test/chrome/browser_alarm.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webapprt/test/chrome/browser_alarm.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+Cu.import("resource://gre/modules/Services.jsm");
+
+function test() {
+  waitForExplicitFinish();
+
+  let mutObserverAlarmSet = null;
+  let mutObserverAlarmFired = null;
+
+  let alarmSet = false;
+
+  loadWebapp("alarm.webapp", undefined, function onLoad() {
+    let principal = document.getElementById("content").contentDocument.defaultView.document.nodePrincipal;
+    let permValue = Services.perms.testExactPermissionFromPrincipal(principal, "alarms");
+    is(permValue, Ci.nsIPermissionManager.ALLOW_ACTION, "Alarm permission: allow.");
+
+    let msgSet = gAppBrowser.contentDocument.getElementById("msgSet");
+    mutObserverAlarmSet = new MutationObserver(function(mutations) {
+      is(msgSet.textContent, "Success.", "Alarm added.");
+      alarmSet = true;
+    });
+    mutObserverAlarmSet.observe(msgSet, { childList: true });
+
+    let msgFired = gAppBrowser.contentDocument.getElementById("msgFired");
+    mutObserverAlarmFired = new MutationObserver(function(mutations) {
+      is(msgFired.textContent, "Alarm fired.", "Alarm fired.");
+
+      ok(alarmSet, "Alarm set before firing.");
+
+      finish();
+    });
+    mutObserverAlarmFired.observe(msgFired, { childList: true });
+  });
+
+  registerCleanupFunction(function() {
+    mutObserverAlarmSet.disconnect();
+    mutObserverAlarmFired.disconnect();
+  });
+}