test_window_open_discarded_bc.html

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<!DOCTYPE html>

<html>

<head>

  <title>Discard a new BrowsingContext during window.open nested event loop</title>

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

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

</head>

<body>

<script>

add_task(async function() {

  const TOPIC = "dangerous:test-only:new-browser-child-ready";

  let found = false;

  function observer(subject) {

    let win = SpecialPowers.wrap(subject);

    if (SpecialPowers.compare(win.opener, window)) {

      found = true;

      SpecialPowers.removeObserver(observer, TOPIC);

      win.close();

      // window.close() is not synchronous, so we need to wait for the

      // BrowsingContext to actually become discarded after we call it, to

      // make sure that the window provider actually has a discarded BC at the

      // end of its own nested event loop.

      SpecialPowers.Services.tm.spinEventLoopUntil(

        "Test(test_window_open_discarded_bc.html:add_task)",

        () => !win.opener

);

  SpecialPowers.addObserver(observer, TOPIC);

  let win = window.open();

  is(found, true, "Our observer should have fired for the new window");

  is(win, null, "window.open() should return null when new window is already closed");

});

</script>

</body>

</html>