[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 "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 "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 "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+typedef ChromeRenderViewHostTestHarness ZoomControllerTest;

[Evan Stade, 2012/11/16 18:34:43]

instead of just a typedef, create a ZoomControllerTest class that does the
initial setup for each test.

[Dan Beam, 2012/11/17 01:20:32]

Done.

+
+class TestZoomObserver : public ZoomObserver {
+ public:
+  MOCK_METHOD2(OnZoomChanged, void(content::WebContents*, bool));
+};
+
+TEST_F(ZoomControllerTest, DidNavigateMainFrame) {
+  ZoomController zoom_controller(web_contents());
+
+  TestZoomObserver zoom_observer;
+  zoom_controller.set_observer(&zoom_observer);
+
+  EXPECT_CALL(zoom_observer, OnZoomChanged(web_contents(), false)).Times(1);
+
+  zoom_controller.DidNavigateMainFrame(content::LoadCommittedDetails(),
+                                       content::FrameNavigateParams());
+}
+
+TEST_F(ZoomControllerTest, OnPreferenceChanged) {
+  ZoomController zoom_controller(web_contents());
+
+  TestZoomObserver zoom_observer;
+  zoom_controller.set_observer(&zoom_observer);
+
+  EXPECT_CALL(zoom_observer, OnZoomChanged(web_contents(), false)).Times(1);
+
+  zoom_controller.OnPreferenceChanged(NULL, prefs::kDefaultZoomLevel);

[Evan Stade, 2012/11/16 18:34:43]

could you actually change the preference instead of calling OnPreferenceChanged
directly?

[Dan Beam, 2012/11/17 01:20:32]

Done.

+}
+
+TEST_F(ZoomControllerTest, Observe) {
+  ZoomController zoom_controller(web_contents());
+
+  TestZoomObserver zoom_observer;
+  zoom_controller.set_observer(&zoom_observer);
+
+  EXPECT_CALL(zoom_observer, OnZoomChanged(web_contents(), false)).Times(1);
+
+  std::string host;
+  zoom_controller.Observe(content::NOTIFICATION_ZOOM_LEVEL_CHANGED,

[Evan Stade, 2012/11/16 18:34:43]

likewise, is it possible to get the HostZoomMap and call SetZoomLevel?

[Dan Beam, 2012/11/17 01:20:32]

Done.

+                          content::Source<content::WebContents>(web_contents()),
+                          content::Details<std::string>(&host));
+}