Overview Tray Button should not be visible on login screen

ash/system/overview/overview_button_tray_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/system/overview/overview_button_tray.h"
 
 #include "ash/display/display_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/system/status_area_widget.h"
+#include "ash/system/user/login_status.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/overview/window_selector_controller.h"
 #include "base/time/time.h"
 #include "ui/events/event.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/gestures/gesture_types.h"
 #include "ui/views/controls/image_view.h"
 
 namespace ash {
 
@@ skipping 88 matching lines @@
 TEST_F(OverviewButtonTrayTest, SecondaryTrayCreatedVisible) {
   if (!SupportsMultipleDisplays())
     return;
 
   Shell::GetInstance()->EnableMaximizeModeWindowManager(true);
   UpdateDisplay("400x400,200x200");
   EXPECT_TRUE(GetSecondaryTray()->visible());
   Shell::GetInstance()->EnableMaximizeModeWindowManager(false);
 }
 
+// Tests that the tray loses visibility when a user logs out, and that it
+// regains visibility when a user logs back in.
+TEST_F(OverviewButtonTrayTest, VisibilityChangesForLoginStatus) {
+  Shell::GetInstance()->EnableMaximizeModeWindowManager(true);
+  SetUserLoggedIn(false);
+  Shell::GetInstance()->UpdateAfterLoginStatusChange(user::LOGGED_IN_NONE);
+  EXPECT_FALSE(GetTray()->visible());
+  SetUserLoggedIn(true);
+  SetSessionStarted(true);
+  Shell::GetInstance()->UpdateAfterLoginStatusChange(user::LOGGED_IN_USER);
+  EXPECT_TRUE(GetTray()->visible());
+  Shell::GetInstance()->EnableMaximizeModeWindowManager(false);
+}
+
 }  // namespace ash