The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

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

 function test() {

   waitForExplicitFinish();

   showTabView(onTabViewShown);

 }

 function onTabViewShown() {

   let contentWindow = TabView.getContentWindow();

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

   let groupItem = contentWindow.GroupItems.groupItems[0];

   let tabItems = groupItem.getChildren();

   is(tabItems.length, 1, "There is only one tabItems in the groupItem");

   let bounds = groupItem.bounds;

   gBrowser.addTab();

   gBrowser.removeTab(gBrowser.tabs[1]);

   ok(bounds.equals(groupItem.bounds), 'Group bounds recovered'); 

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

   hideTabView(finish);

 }