test_event_listener_leaks.html

Enable keyboard shortcuts

<!--

  Any copyright is dedicated to the Public Domain.

  http://creativecommons.org/publicdomain/zero/1.0/

-->

<!DOCTYPE HTML>

<html>

<head>

  <title>Bug 1450358 - Test BroadcastChannel event listener leak conditions</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script type="text/javascript" src="/tests/dom/events/test/event_leak_utils.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

</head>

<body>

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

// Manipulate BroadcastChannel objects in the frame's context.

// Its important here that we create a listener callback from

// the DOM objects back to the frame's global in order to

// exercise the leak condition.

let count = 0;

async function useBroadcastChannel(contentWindow) {

  contentWindow.messageCount = 0;

  count += 1;

  const name = `test_event_listener_leaks-${count}`;

  let bc = new contentWindow.BroadcastChannel(name);

  let outer = new BroadcastChannel(name);

  outer.postMessage("foo");

  await new Promise(resolve => {

    bc.onmessage = () => {

      contentWindow.messageCount += 1;

      resolve();

};

});

  is(contentWindow.messageCount, 1, "message should be received");

async function runTest() {

  try {

    await checkForEventListenerLeaks("BroadcastChannel", useBroadcastChannel);

  } catch (e) {

    ok(false, e);

  } finally {

    SimpleTest.finish();

SimpleTest.waitForExplicitFinish();

addEventListener("load", runTest, { once: true });

</script>

</pre>

</body>

</html>