test_bug1127588.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=1127588

-->

<head>

  <script src="/tests/SimpleTest/SimpleTest.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=1127588">Mozilla Bug 1127588</a>

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

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

<script type="application/javascript">

/** Test for Bug 1127588 **/

SimpleTest.waitForExplicitFinish();

window.onload = function () {

  let insertedEventCount = 0;

  let insertedListener = function() {

    insertedEventCount++;

};

  let removedEventCount = 0;

  let removedListener = function() {

    removedEventCount++;

};

  // Tests for no title element.

  document.addEventListener('DOMNodeRemoved', removedListener);

  document.addEventListener('DOMNodeInserted', insertedListener);

  document.title = "Test for Bug 1127588";

  document.removeEventListener('DOMNodeInserted', insertedListener);

  document.removeEventListener('DOMNodeRemoved', removedListener);

  // Check result.

  is(insertedEventCount, 2, "Should get 'DOMNodeInserted' mutation event");

  is(removedEventCount, 0, "Should not get 'DOMNodeRemoved' mutation event");

  // Test for updating title element.

  insertedEventCount = 0;

  removedEventCount = 0;

  document.addEventListener('DOMNodeRemoved', removedListener);

  document.addEventListener('DOMNodeInserted', insertedListener);

  // eslint-disable-next-line no-self-assign

  document.title = document.title;

  document.removeEventListener('DOMNodeInserted', insertedListener);

  document.removeEventListener('DOMNodeRemoved', removedListener);

  // Check result.

  is(insertedEventCount, 1, "Should get 'DOMNodeInserted' mutation event");

  is(removedEventCount, 1, "Should get 'DOMNodeRemoved' mutation event");

  SimpleTest.finish();

};

</script>

</body>

</html>