<!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";

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

  var x = navigator.hardwareConcurrency;
  is(typeof x, "number", "hardwareConcurrency should be a number.");
  ok(x > 0, "hardwareConcurrency should be greater than 0.");

  SimpleTest.waitForExplicitFinish();

  resistFingerprinting(true).then(() => {
    const y = navigator.hardwareConcurrency;
    ok(y === 2, "hardwareConcurrency should always be 2 when we're resisting fingerprinting.");

    resistFingerprinting(false).then(() => {
      const z = navigator.hardwareConcurrency;
      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>
