text: /* Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/ */
  
  function test() {
    let cw;
  
    let createGroupItem = function () {
      let bounds = new cw.Rect(20, 20, 200, 200);
      let groupItem = new cw.GroupItem([], {bounds: bounds, immediately: true});
  
      cw.UI.setActive(groupItem);
      gBrowser.loadOneTab('about:blank', {inBackground: true});
  
      return groupItem;
    }
  
    let finishTest = function () {
      ok(!TabView.isVisible(), 'cleanup: tabview is hidden');
      is(gBrowser.tabs.length, 1, 'cleanup: there is one tab, only');
      is(cw.GroupItems.groupItems.length, 1, 'cleanup: there is one group, only');
  
      finish();
    }
  
    let testAddChildFromAnotherGroup = function () {
      let sourceGroup = cw.GroupItems.groupItems[0];
      let targetGroup = createGroupItem();
  
      afterAllTabsLoaded(function () {
        // check setup
        is(sourceGroup.getChildren().length, 1, 'setup: source group has one child');
        is(targetGroup.getChildren().length, 1, 'setup: target group has one child');
  
        let tabItem = sourceGroup.getChild(0);
        targetGroup.add(tabItem);
  
        // check state after adding tabItem to targetGroup
        is(tabItem.parent, targetGroup, 'tabItem changed groups');
        is(cw.GroupItems.groupItems.length, 1, 'source group was closed automatically');
        is(targetGroup.getChildren().length, 2, 'target group has now two children');
  
        // cleanup and finish
        tabItem.close();
        hideTabView(finishTest);
      });
    }
  
    waitForExplicitFinish();
  
    showTabView(function () {
      cw = TabView.getContentWindow();
      testAddChildFromAnotherGroup();
    });
  }
  