dom/workers/test/test_navigator_workers_hardwareConcurrency.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4   <meta charset="utf-8">
   5   <title>Test for Navigator.hardwareConcurrency</title>
   6   <script src="/tests/SimpleTest/SimpleTest.js"></script>
   7   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
   8   <script type="application/javascript">
   9   "use strict";
  10
  11   SimpleTest.waitForExplicitFinish();
  12
  13   function getWorkerHardwareConcurrency(onmessage) {
  14     var script = "postMessage(navigator.hardwareConcurrency)";
  15     var url = URL.createObjectURL(new Blob([script]));
  16     var w = new Worker(url);
  17     w.onmessage = onmessage;
  18   }
  19
  20   function resistFingerprinting(value) {
  21     return SpecialPowers.pushPrefEnv({"set": [["privacy.resistFingerprinting", value]]});
  22   }
  23
  24   getWorkerHardwareConcurrency(e => {
  25     var x = e.data;
  26     is(typeof x, "number", "hardwareConcurrency should be a number.");
  27     ok(x > 0, "hardwareConcurrency should be greater than 0.");
  28
  29     resistFingerprinting(true).then(() => {
  30       getWorkerHardwareConcurrency(msg => {
  31         const y = msg.data;
  32         ok(y === 2, "hardwareConcurrency should always be 2 when we're resisting fingerprinting.");
  33
  34         resistFingerprinting(false).then(() => {
  35           getWorkerHardwareConcurrency(msg1 => {
  36             const z = msg1.data;
  37             ok(z === x, "hardwareConcurrency should be the same as before we were resisting fingerprinting.");
  38
  39             SimpleTest.finish();
  40           });
  41         });
  42       });
  43     });
  44   });
  45
  46   </script>
  47 </head>
  48 <body>
  49 <p id="display"></p>
  50 <div id="content" style="display: none">
  51
  52 </div>
  53 <pre id="test">
  54 </pre>
  55 </body>
  56 </html>