test_weakRefs_cross_compartment.html

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<!DOCTYPE HTML>

<html>

  <head>

    <meta charset="utf-8">

    <title>Test WeakRef works when target is in different compartment in the browser</title>

    <script src="/tests/SimpleTest/SimpleTest.js"></script>

    <script type="application/javascript">

      function go() {

        SimpleTest.waitForExplicitFinish();

        let Cu = SpecialPowers.Cu;

        let isSameCompartment = Cu.getJSTestingFunctions().isSameCompartment;

        // Open a new window, which will be from different compartment.

        let win = window.open();

        is(isSameCompartment(win, window), false,

           "Test for opeing a window from a different compartment.");

        let wr1, wr2, wr3;

          let obj = {};

          // WeakRef and target are both from different compartment.

          wr1 = new win.WeakRef(new win.Object());

          // WeakRef is same compartment, but target isn't.

          wr2 = new WeakRef(new win.Object());

          // WeakRef is in different compartment, but target is.

          wr3 = new win.WeakRef(obj);

          obj = null;

        // WeakRef should keep the target in the current task.

        isnot(wr1.deref(), undefined, "wr1.deref() should return its target.");

        isnot(wr2.deref(), undefined, "wr2.deref() should return its target.");

        isnot(wr3.deref(), undefined, "we3.deref() should return its target.");

        // Weakref should keep the target until the end of current Job, that

        // includes microtask(Promise).

        Promise.resolve().then(() => {

          isnot(wr1.deref(), undefined,

                "wr1.deref() should return its target in promise");

          isnot(wr2.deref(), undefined,

                "wr2.deref() should return its target in promise");

          isnot(wr3.deref(), undefined,

                "wr3.deref() should return its target in promise");

});

        // setTimeout will launch a new job and call ClearKeptObjects().

        setTimeout(() => {

          // Call gc() forcibly to clear the target of wr.

          SpecialPowers.DOMWindowUtils.garbageCollect();

          is(wr1.deref(), undefined, "wr1.deref() should return undefined in the new job.");

          is(wr2.deref(), undefined, "wr2.deref() should return undefined in the new job.");

          is(wr3.deref(), undefined, "wr3.deref() should return undefined in the new job.");

          win.close();

          SimpleTest.finish();

        }, 0);

    </script>

  </head>

  <body onload="go()"></body>

</html>