test_navigator_workers_hardwareConcurrency.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <title>Test for Navigator.hardwareConcurrency</title>

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

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

  <script type="application/javascript">

  "use strict";

  SimpleTest.waitForExplicitFinish();

  function getWorkerHardwareConcurrency(onmessage) {

    var script = "postMessage(navigator.hardwareConcurrency)";

    var url = URL.createObjectURL(new Blob([script]));

    var w = new Worker(url);

    w.onmessage = onmessage;

  function resistFingerprinting(value) {

    return SpecialPowers.pushPrefEnv({"set": [["privacy.resistFingerprinting", value]]});

  getWorkerHardwareConcurrency(e => {

    var x = e.data;

    is(typeof x, "number", "hardwareConcurrency should be a number.");

    ok(x > 0, "hardwareConcurrency should be greater than 0.");

    resistFingerprinting(true).then(() => {

      getWorkerHardwareConcurrency(msg => {

        const y = msg.data;

        ok(y === 2, "hardwareConcurrency should always be 2 when we're resisting fingerprinting.");

        resistFingerprinting(false).then(() => {

          getWorkerHardwareConcurrency(msg1 => {

            const z = msg1.data;

            ok(z === x, "hardwareConcurrency should be the same as before we were resisting fingerprinting.");

            SimpleTest.finish();

});

});

});

});

});

  </script>

</head>

<body>

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

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

</div>

<pre id="test">

</pre>

</body>

</html>