js/xpconnect/tests/mochitest/test_finalizationRegistry_incumbent.html

   1 <!DOCTYPE HTML>
   2 <html>
   3   <head>
   4     <meta charset="utf-8">
   5     <title>Test FinalizationRegistry tracks its incumbent global</title>
   6     <script src="/tests/SimpleTest/SimpleTest.js"></script>
   7     <script type="application/javascript">
   8       let resolvePromise, rejectPromise;
   9
  10       async function runTest(global, callback) {
  11         let fr = new global.FinalizationRegistry(callback);
  12         fr.register({}, undefined);
  13
  14         SpecialPowers.DOMWindowUtils.garbageCollect();
  15
  16         let promise = new Promise((resolve, reject) => {
  17           resolvePromise = resolve;
  18           rejectPromise = reject;
  19         });
  20
  21         return promise;
  22       }
  23
  24       function receiveMessage(event) {
  25         resolvePromise(event.source.sourceName);
  26       }
  27
  28       async function go() {
  29         // This test uses FinalizationRegistry to trigger a callback and reports
  30         // the incumbent global in the callback using postMessage. In all cases
  31         // the author function that scheduled the callback is runTest(), so the
  32         // incumbent global should be the main window.
  33
  34         SimpleTest.waitForExplicitFinish();
  35
  36         window.sourceName = "main";
  37         window.addEventListener("message", receiveMessage, false);
  38
  39         let other = window.frames[0];
  40         other.sourceName = "other";
  41         other.addEventListener("message", receiveMessage, false);
  42
  43         is(await runTest(window, v => window.postMessage(v)), "main");
  44         is(await runTest(window, window.postMessage.bind(window)), "main");
  45         is(await runTest(other, v => other.postMessage(v)), "main");
  46         is(await runTest(other, other.postMessage.bind(other)), "main");
  47         is(await runTest(window, v => other.postMessage(v)), "main");
  48         is(await runTest(window, other.postMessage.bind(other)), "main");
  49         is(await runTest(other, v => window.postMessage(v)), "main");
  50         is(await runTest(other, window.postMessage.bind(window)), "main");
  51
  52         SimpleTest.finish();
  53       }
  54     </script>
  55   </head>
  56   <body onload="go()">
  57     <div style="display: none">
  58       <!-- A subframe so we have another global to work with -->
  59       <iframe></iframe>
  60     </div>
  61   </body>
  62 </html>