test_bug339494.xhtml

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<?xml version="1.0"?>

<?xml-stylesheet href="chrome://global/skin" type="text/css"?>

<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css" type="text/css"?>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=339494

-->

<window title="Mozilla Bug 339494"

  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"

  xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

<body  xmlns="http://www.w3.org/1999/xhtml">

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=339494">Mozilla Bug 339494</a>

<p id="display"></p>

<div id="content" style="display: none">

  <xul:hbox id="d"/>

  <xul:hbox id="s"/>

</div>

<pre id="test">

</pre>

</body>

<script class="testbody" type="application/javascript">

/** Test for Bug 339494 **/

SimpleTest.waitForExplicitFinish();

(async function runTests() {

  function promiseFlushingMutationObserver() {

    return new Promise(SimpleTest.executeSoon);

  await (async function() {

    const d = document.getElementById("d");

    d.setAttribute("hhh", "testvalue");

    await promiseFlushingMutationObserver();

    const observer = new MutationObserver((aMutationList, aObserver) => {

      ok(!d.hasAttribute("hhh"), "Value check 1. There should be no value");

      isnot(d.getAttribute("hhh"), "testvalue", "Value check 2");

      aObserver.disconnect();

      d.removeAttribute("hhh");

      ok(true, "Reachability. We shouldn't have crashed");

});

    observer.observe(d, { attributes: true });

    d.removeAttribute("hhh");

    await promiseFlushingMutationObserver();

  })();

  await (async function() {

    const s = document.getElementById("s");

    s.setAttribute("ggg", "testvalue");

    await promiseFlushingMutationObserver();

    const observer = new MutationObserver(() => {

      ok(s.hasAttribute("ggg"), "Value check 3. There should be a value");

      isnot(s.getAttribute("ggg"), "testvalue", "Value check 4");

      is(s.getAttribute("ggg"), "othervalue", "Value check 5");

});

    observer.observe(s, { attributes: true });

    s.setAttribute("ggg", "othervalue");

    await promiseFlushingMutationObserver();

    observer.disconnect();

  })();

  SimpleTest.finish();

})();

</script>

</window>