test_notAllowedToStartAudioContextGC.html

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<html>

<head>

  <title>Test GC for not-allow-to-start audio context</title>

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

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

</head>

<body>

<pre id="test">

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

SimpleTest.requestFlakyTimeout(`Checking that something does not happen`);

SimpleTest.waitForExplicitFinish();

var destId;

function observer(subject, topic, data) {

  let id = parseInt(data);

  ok(id != destId, "dropping another node, not the context's destination");

SpecialPowers.addAsyncObserver(observer, "webaudio-node-demise", false);

SimpleTest.registerCleanupFunction(function() {

  SpecialPowers.removeAsyncObserver(observer, "webaudio-node-demise");

});

SpecialPowers.pushPrefEnv({"set": [["media.autoplay.default", SpecialPowers.Ci.nsIAutoplay.BLOCKED],

                                   ["media.autoplay.blocking_policy", 0]]},

                          startTest);

function startTest() {

  info("- create audio context -");

  let ac = new AudioContext();

  info("- get node Id -");

  destId = SpecialPowers.getPrivilegedProps(ac.destination, "id");

  info("- trigger GCs -");

  SpecialPowers.forceGC();

  SpecialPowers.forceCC();

  SpecialPowers.forceGC();

  info("- after three GCs -");

  // We're doing this async so that we can receive observerservice messages.

  setTimeout(function() {

    ok(true, `AudioContext that has been prevented

              from starting has correctly survived GC`)

    SimpleTest.finish();

  }, 1);

</script>

</pre>

</body>

</html>