diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug628270.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug628270.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,98 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  let cw;
+  let prefix = 'start';
+
+  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('http://mochi.test:8888/', {inBackground: true});
+    gBrowser.loadOneTab('http://mochi.test:8888/', {inBackground: true});
+
+    let groupItemId = groupItem.id;
+    registerCleanupFunction(function() {
+      let groupItem = cw.GroupItems.groupItem(groupItemId);
+      if (groupItem)
+        groupItem.close();
+    });
+  }
+
+  let getGroupItem = function (index) {
+    return cw.GroupItems.groupItems[index];
+  }
+
+  let activateFirstGroupItem = function () {
+    let activeTabItem = getGroupItem(0).getChild(0);
+    cw.GroupItems.updateActiveGroupItemAndTabBar(activeTabItem);
+  }
+
+  let assertTabViewIsHidden = function () {
+    ok(!TabView.isVisible(), prefix + ': tabview is hidden');
+  }
+
+  let assertNumberOfGroups = function (num) {
+    is(cw.GroupItems.groupItems.length, num, prefix + ': there are ' + num + ' groups');
+  }
+
+  let assertNumberOfTabs = function (num) {
+    is(gBrowser.visibleTabs.length, num, prefix + ': there are ' + num + ' tabs');
+  }
+
+  let assertNumberOfPinnedTabs = function (num) {
+    is(gBrowser._numPinnedTabs, num, prefix + ': there are ' + num + ' pinned tabs');
+  }
+
+  let assertNumberOfTabsInGroup = function (groupItem, num) {
+    is(groupItem.getChildren().length, num, prefix + ': there are ' + num + ' tabs in the group');
+  }
+
+  let assertValidPrerequisites = function () {
+    assertNumberOfTabs(1);
+    assertNumberOfGroups(1);
+    assertNumberOfPinnedTabs(0);
+  }
+
+  let finishTest = function () {
+    prefix = 'finish';
+    assertValidPrerequisites();
+    assertTabViewIsHidden();
+    finish();
+  }
+
+  let testRestoreTabFromInactiveGroup = function () {
+    prefix = 'restore';
+    activateFirstGroupItem();
+
+    let groupItem = getGroupItem(1);
+    let tabItem = groupItem.getChild(0);
+
+    EventUtils.synthesizeMouseAtCenter(
+      tabItem.$close[0], {}, TabView.getContentWindow());
+    assertNumberOfTabsInGroup(groupItem, 1);
+
+    restoreTab(function () {
+      assertNumberOfTabsInGroup(groupItem, 2);
+
+      activateFirstGroupItem();
+      gBrowser.removeTab(gBrowser.tabs[1]);
+      gBrowser.removeTab(gBrowser.tabs[1]);
+      hideTabView(finishTest);
+    });
+  }
+
+  waitForExplicitFinish();
+  assertTabViewIsHidden();
+  registerCleanupFunction(function () TabView.hide());
+
+  showTabView(function () {
+    cw = TabView.getContentWindow();
+    assertValidPrerequisites();
+
+    createGroupItem();
+    afterAllTabsLoaded(testRestoreTabFromInactiveGroup);
+  });
+}