fune/browser/components/sessionstore/test/browser_662812.js

/* Any copyright is dedicated to the Public Domain.
   http://creativecommons.org/publicdomain/zero/1.0/ */

function test() {
  waitForExplicitFinish();

  window.addEventListener(
    "SSWindowStateBusy",
    function() {
      let state = JSON.parse(ss.getWindowState(window));
      ok(state.windows[0].busy, "window is busy");

      window.addEventListener(
        "SSWindowStateReady",
        function() {
          let state2 = JSON.parse(ss.getWindowState(window));
          ok(!state2.windows[0].busy, "window is not busy");

          executeSoon(() => {
            gBrowser.removeTab(gBrowser.tabs[1]);
            finish();
          });
        },
        { once: true }
      );
    },
    { once: true }
  );

  // create a new tab
  let tab = BrowserTestUtils.addTab(gBrowser, "about:mozilla");
  let browser = tab.linkedBrowser;

  // close and restore it
  browser.addEventListener(
    "load",
    function() {
      gBrowser.removeTab(tab);
      ss.undoCloseTab(window, 0);
    },
    { capture: true, once: true }
  );
}