diff -r 000000000000 -r 6474c204b198 testing/mochitest/tests/browser/browser_add_task.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/mochitest/tests/browser/browser_add_task.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+let test1Complete = false;
+let test2Complete = false;
+
+function executeWithTimeout() {
+  let deferred = Promise.defer();
+  executeSoon(function() {
+    ok(true, "we get here after a timeout");
+    deferred.resolve();
+  });
+  return deferred.promise;
+}
+
+add_task(function asyncTest_no1() {
+  yield executeWithTimeout();
+  test1Complete = true;
+});
+
+add_task(function asyncTest_no2() {
+  yield executeWithTimeout();
+  test2Complete = true;
+});
+
+add_task(function() {
+  ok(test1Complete, "We have been through test 1");
+  ok(test2Complete, "We have been through test 2");
+});