test_event_listener_leaks.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Bug 1450358 - Test AudioContext 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 AudioContext 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.

async function useAudioContext(contentWindow) {

  let ctx = new contentWindow.AudioContext();

  ctx.onstatechange = () => {

    contentWindow.stateChangeCount += 1;

};

  let osc = ctx.createOscillator();

  osc.type = "sine";

  osc.frequency.value = 440;

  osc.start();

async function runTest() {

  try {

    await checkForEventListenerLeaks("AudioContext", useAudioContext);

  } catch (e) {

    ok(false, e);

  } finally {

    SimpleTest.finish();

SimpleTest.waitForExplicitFinish();

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

</script>

</pre>

</body>

</html>