diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug608405.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug608405.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,54 @@
+/* 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
+      targetGroup.getChild(0).close();
+      hideTabView(finishTest);
+    });
+  }
+
+  waitForExplicitFinish();
+
+  showTabView(function () {
+    cw = TabView.getContentWindow();
+    testAddChildFromAnotherGroup();
+  });
+}