[zoom bubble] Add tests for ZoomController::UpdateState() handling empty hosts.

chrome/browser/ui/zoom/zoom_controller_unittest.cc

+// Copyright (c) 2012 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 "base/message_loop.h"
+#include "chrome/browser/prefs/pref_service.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/zoom/zoom_controller.h"
+#include "chrome/browser/ui/zoom/zoom_observer.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/test/base/chrome_render_view_host_test_harness.h"
+#include "chrome/test/base/testing_profile.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/host_zoom_map.h"
+#include "content/public/browser/navigation_details.h"
+#include "content/public/browser/notification_details.h"
+#include "content/public/browser/notification_source.h"
+#include "content/public/browser/notification_types.h"
+#include "content/public/common/frame_navigate_params.h"
+#include "content/public/test/test_browser_thread.h"
+#include "content/public/test/test_utils.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+class TestZoomObserver : public ZoomObserver {
+ public:
+  MOCK_METHOD2(OnZoomChanged, void(content::WebContents*, bool));
+};
+
+class ZoomControllerTest : public ChromeRenderViewHostTestHarness {
+ public:
+  ZoomControllerTest()
+      : ui_thread_(content::BrowserThread::UI, MessageLoop::current()) {}
+
+  virtual void SetUp() OVERRIDE {
+    ChromeRenderViewHostTestHarness::SetUp();
+    zoom_controller_.reset(new ZoomController(web_contents()));
+    zoom_controller_->set_observer(&zoom_observer_);
+  }
+
+  virtual void TearDown() OVERRIDE {
+    zoom_controller_.reset();
+    ChromeRenderViewHostTestHarness::TearDown();
+  }
+
+ protected:
+  scoped_ptr<ZoomController> zoom_controller_;
+  TestZoomObserver zoom_observer_;
+
+ private:
+  content::TestBrowserThread ui_thread_;
+  DISALLOW_COPY_AND_ASSIGN(ZoomControllerTest);
+};
+
+TEST_F(ZoomControllerTest, DidNavigateMainFrame) {
+  EXPECT_CALL(zoom_observer_, OnZoomChanged(web_contents(), false)).Times(1);
+  zoom_controller_->DidNavigateMainFrame(content::LoadCommittedDetails(),
+                                         content::FrameNavigateParams());
+}
+
+TEST_F(ZoomControllerTest, OnPreferenceChanged) {
+  EXPECT_CALL(zoom_observer_, OnZoomChanged(web_contents(), false)).Times(1);
+  profile()->GetPrefs()->SetDouble(prefs::kDefaultZoomLevel, 110.0f);
+}
+
+TEST_F(ZoomControllerTest, Observe) {
+  EXPECT_CALL(zoom_observer_, OnZoomChanged(web_contents(), false)).Times(1);
+
+  content::HostZoomMap* host_zoom_map =
+      content::HostZoomMap::GetForBrowserContext(
+          web_contents()->GetBrowserContext());
+
+  content::WindowedNotificationObserver notification_observer(
+      content::NOTIFICATION_ZOOM_LEVEL_CHANGED,
+      content::NotificationService::AllSources());
+
+  host_zoom_map->SetZoomLevel(std::string(), 110.0f);
+
+  notification_observer.Wait();
+}