The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

    http://creativecommons.org/publicdomain/zero/1.0/ */

 function test() {

   waitForExplicitFinish();

   window.addEventListener("tabviewshown", onTabViewWindowLoaded, false);

   TabView.toggle();

 }

 function endGame() {

   window.removeEventListener("tabviewhidden", endGame, false);

   ok(!TabView.isVisible(), "Tab View is hidden");

   finish();

 };

 function onTabViewWindowLoaded() {

   window.removeEventListener("tabviewshown", onTabViewWindowLoaded, false);

   ok(TabView.isVisible(), "Tab View is visible");

   let contentWindow = document.getElementById("tab-view").contentWindow;

   // establish initial state

   is(contentWindow.GroupItems.groupItems.length, 1,

       "we start with one group (the default)");

   is(gBrowser.tabs.length, 1, "we start with one tab");

   let originalTab = gBrowser.tabs[0];

   let bg = contentWindow.document.getElementById("bg");

   EventUtils.sendMouseEvent({ type: "click" }, bg, contentWindow);

   is(contentWindow.GroupItems.groupItems.length, 1,

       "we should still only have one group");

   window.addEventListener("tabviewhidden", endGame, false);

   TabView.toggle();

 }