diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_click_group.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_click_group.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,68 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+let contentWindow;
+let groupItem;
+let groupItemId;
+
+function test() {
+  waitForExplicitFinish();
+
+  registerCleanupFunction(function() {
+    contentWindow.gPrefBranch.clearUserPref("animate_zoom");
+    let createdGroupItem = contentWindow.GroupItems.groupItem(groupItemId)
+    if (createdGroupItem)
+      closeGroupItem(createdGroupItem);
+    hideTabView();
+  });
+
+  showTabView(function() {
+    contentWindow = TabView.getContentWindow();
+    groupItem = createEmptyGroupItem(contentWindow, 300, 300, 200);
+    groupItemId = groupItem.id;
+    testMouseClickOnEmptyGroupItem();
+  });
+}
+
+function testMouseClickOnEmptyGroupItem() {
+  whenTabViewIsHidden(function() {
+    is(groupItem.getChildren().length, 1, "The group item contains one tab item now");
+    showTabView(testDraggingWithinGroupItem);
+  });
+  is(groupItem.getChildren().length, 0, "The group item doesn't contain any tab items");
+  EventUtils.sendMouseEvent({ type: "mousedown" }, groupItem.container, contentWindow);
+  EventUtils.sendMouseEvent({ type: "mouseup" }, groupItem.container, contentWindow);
+}
+
+function testDraggingWithinGroupItem() {
+  let target = groupItem.container;
+  contentWindow.gPrefBranch.setBoolPref("animate_zoom", false);
+
+  // stimulate drag and drop
+  EventUtils.sendMouseEvent( {type: "mousedown" }, target, contentWindow);
+  EventUtils.synthesizeMouse(target, 10, 10, { type: "mousemove" }, contentWindow);
+  ok(groupItem.isDragging, "The group item is being dragged")
+
+  EventUtils.sendMouseEvent({ type: "mouseup" }, target, contentWindow);
+  ok(!groupItem.isDragging, "The dragging is competely");
+
+  executeSoon(function() {
+    ok(TabView.isVisible(), "The tab view is still visible after dragging");
+    contentWindow.gPrefBranch.clearUserPref("animate_zoom");
+
+    testMouseClickOnGroupItem();
+  });
+}
+
+function testMouseClickOnGroupItem() {
+  whenTabViewIsHidden(function() {
+    is(groupItem.getChildren().length, 1, "The group item still contains one tab item");
+
+    closeGroupItem(groupItem, function() {
+      hideTabView(finish);
+    });
+  });
+  EventUtils.sendMouseEvent({ type: "mousedown" }, groupItem.container, contentWindow);
+  EventUtils.sendMouseEvent({ type: "mouseup" }, groupItem.container, contentWindow);
+}
+