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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for mochitest add_task, found in SpawnTask.js</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=">Mozilla Bug 1187701</a>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+// 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>
+</pre>
+</body>
+</html>
+