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diff --git a/testing/mochitest/chrome/test_sanityAddTask.xul b/testing/mochitest/chrome/test_sanityAddTask.xul
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+<?xml version="1.0"?>
+<!-- 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/. -->
+<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css"
+ type="text/css"?>
+<window title="Test spawnTawk function"
+ xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+ <script type="application/javascript"
+ src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+ <script type="application/javascript"
+ src="chrome://mochikit/content/tests/SimpleTest/SpawnTask.js"/>
+ <script type="application/javascript">
+ <![CDATA[
+
+ // Check that we can 'add_task' a few times and all tasks run asynchronously before test finishes.
+
+ add_task(function* () {
+ var x = yield Promise.resolve(1);
+ is(x, 1, "task yields Promise value as expected");
+ });
+
+ add_task(function* () {
+ var x = yield [Promise.resolve(1), Promise.resolve(2), Promise.resolve(3)];
+ is(x.join(""), "123", "task yields Promise value as expected");
+ });
+
+ add_task(function* () {
+ var x = yield (function* () {
+ return 3;
+ }());
+ is(x, 3, "task yields generator function return value as expected");
+ });
+
+ ]]>
+ </script>
+ <body xmlns="http://www.w3.org/1999/xhtml" >
+ </body>
+</window>
+
+
+
+