Add test to verify that the stacking controller picks the correct activatable window for menu.

ui/aura_shell/stacking_controller_unittest.cc

 // Copyright (c) 2011 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 "ui/aura_shell/stacking_controller.h"
 
 #include "ui/aura/desktop.h"
+#include "ui/aura/test/event_generator.h"
 #include "ui/aura/test/test_windows.h"
 #include "ui/aura/test/test_window_delegate.h"
 #include "ui/aura_shell/test/aura_shell_test_base.h"
 
 namespace aura_shell {
 namespace test {
 
 typedef aura_shell::test::AuraShellTestBase StackingControllerTest;
 
 TEST_F(StackingControllerTest, GetTopmostWindowToActivate) {
   aura::test::ActivateWindowDelegate activate;
   aura::test::ActivateWindowDelegate non_activate(false);
 
   scoped_ptr<aura::Window> w1(aura::test::CreateTestWindowWithDelegate(
       &non_activate, 1, gfx::Rect(), NULL));
   scoped_ptr<aura::Window> w2(aura::test::CreateTestWindowWithDelegate(
       &activate, 2, gfx::Rect(), NULL));
   scoped_ptr<aura::Window> w3(aura::test::CreateTestWindowWithDelegate(
       &non_activate, 3, gfx::Rect(), NULL));
   EXPECT_EQ(w2.get(), aura::Desktop::GetInstance()->stacking_client()->
       GetTopmostWindowToActivate(NULL));
 }
 
+// Test if the clicking on a menu picks the transient parent as activatable
+// window.
+TEST_F(StackingControllerTest, ClickOnMenu) {
+  aura::test::ActivateWindowDelegate activate;
+  aura::test::ActivateWindowDelegate non_activate(false);
+
+  scoped_ptr<aura::Window> w1(aura::test::CreateTestWindowWithDelegate(
+      &activate, 1, gfx::Rect(100, 100), NULL));
+  EXPECT_EQ(NULL, aura::Desktop::GetInstance()->active_window());
+
+  // Clicking on an activatable window activtes the window.
+  aura::test::EventGenerator generator(w1.get());
+  generator.ClickLeftButton();
+  EXPECT_EQ(w1.get(), aura::Desktop::GetInstance()->active_window());
+
+  // Creates a menu that covers the transient parent.
+  scoped_ptr<aura::Window> menu(aura::test::CreateTestWindowWithDelegateAndType(
+      &non_activate, aura::WINDOW_TYPE_MENU, 2, gfx::Rect(100, 100), NULL));
+  w1->AddTransientChild(menu.get());
+
+  // Clicking on a menu whose transient parent is active window shouldn't
+  // change the active window.
+  generator.ClickLeftButton();
+  EXPECT_EQ(w1.get(), aura::Desktop::GetInstance()->active_window());
+}
+
 }  // namespace test
 }  // namespace aura_shell