dom/power/tests/test_dynamic_pref_change.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4   <meta charset="utf-8">
   5   <title>Test Screen Wake Lock responds to dynamic pref changes</title>
   6   <script src="/tests/SimpleTest/SimpleTest.js"></script>
   7   <link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
   8   <script type="application/javascript">
   9     /* globals SpecialPowers */
  10     'use strict';
  11
  12     function spinEventLoop() {
  13         return new Promise(resolve => {
  14             setTimeout(resolve, 0);
  15         });
  16     }
  17
  18     add_task(async function my_test() {
  19       const lock = await navigator.wakeLock.request("screen");
  20       await SpecialPowers.pushPrefEnv({
  21         set: [["dom.screenwakelock.enabled", false]],
  22       });
  23       await spinEventLoop();
  24       ok(lock.released, "Lock was released once pref was deactivated");
  25       await SpecialPowers.popPrefEnv();
  26     });
  27   </script>
  28 </head>
  29 <body>
  30 <p id="display"></p>
  31 <div id="content" style="display: none"></div>
  32 <pre id="test"></pre>
  33 </body>
  34 </html>