js/xpconnect/tests/mochitest/test_weakRefs_cross_compartment.html

   1 <!DOCTYPE HTML>
   2 <html>
   3   <head>
   4     <meta charset="utf-8">
   5     <title>Test WeakRef works when target is in different compartment in the browser</title>
   6     <script src="/tests/SimpleTest/SimpleTest.js"></script>
   7     <script type="application/javascript">
   8       function go() {
   9         SimpleTest.waitForExplicitFinish();
  10
  11         let Cu = SpecialPowers.Cu;
  12         let isSameCompartment = Cu.getJSTestingFunctions().isSameCompartment;
  13
  14         // Open a new window, which will be from different compartment.
  15         let win = window.open();
  16         is(isSameCompartment(win, window), false,
  17            "Test for opeing a window from a different compartment.");
  18
  19         let wr1, wr2, wr3;
  20         {
  21           let obj = {};
  22
  23           // WeakRef and target are both from different compartment.
  24           wr1 = new win.WeakRef(new win.Object());
  25
  26           // WeakRef is same compartment, but target isn't.
  27           wr2 = new WeakRef(new win.Object());
  28
  29           // WeakRef is in different compartment, but target is.
  30           wr3 = new win.WeakRef(obj);
  31
  32           obj = null;
  33         }
  34
  35         // WeakRef should keep the target in the current task.
  36         isnot(wr1.deref(), undefined, "wr1.deref() should return its target.");
  37         isnot(wr2.deref(), undefined, "wr2.deref() should return its target.");
  38         isnot(wr3.deref(), undefined, "we3.deref() should return its target.");
  39
  40         // Weakref should keep the target until the end of current Job, that
  41         // includes microtask(Promise).
  42         Promise.resolve().then(() => {
  43           isnot(wr1.deref(), undefined,
  44                 "wr1.deref() should return its target in promise");
  45           isnot(wr2.deref(), undefined,
  46                 "wr2.deref() should return its target in promise");
  47           isnot(wr3.deref(), undefined,
  48                 "wr3.deref() should return its target in promise");
  49         });
  50
  51         // setTimeout will launch a new job and call ClearKeptObjects().
  52         setTimeout(() => {
  53           // Call gc() forcibly to clear the target of wr.
  54           SpecialPowers.DOMWindowUtils.garbageCollect();
  55
  56           is(wr1.deref(), undefined, "wr1.deref() should return undefined in the new job.");
  57           is(wr2.deref(), undefined, "wr2.deref() should return undefined in the new job.");
  58           is(wr3.deref(), undefined, "wr3.deref() should return undefined in the new job.");
  59
  60           win.close();
  61           SimpleTest.finish();
  62         }, 0);
  63       }
  64
  65     </script>
  66   </head>
  67   <body onload="go()"></body>
  68 </html>