The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

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

 let newTab;

 function test() {

   waitForExplicitFinish();

   newTab = gBrowser.addTab();

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

   TabView.toggle();

 }

 function onTabViewWindowLoaded() {

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

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

   is(contentWindow.GroupItems.groupItems.length, 1, "Has one group only");

   let tabItems = contentWindow.GroupItems.groupItems[0].getChildren();

   ok(tabItems.length, 2, "There are two tabItems in the group");

   is(tabItems[1].tab, newTab, "The second tabItem is linked to the new tab");

   EventUtils.sendMouseEvent({ type: "mousedown", button: 1 }, tabItems[1].container, contentWindow);

   EventUtils.sendMouseEvent({ type: "mouseup", button: 1 }, tabItems[1].container, contentWindow);

   ok(tabItems.length, 1, "There is only one tabItem in the group");

   let endGame = function() {

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

     finish();

   };

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

   TabView.toggle();

 }