Decompose BrowserStateMonitor into two parts, simplifying unit tests and APIs.

chrome/browser/chromeos/input_method/input_method_persistence_unittest.cc

Index: chrome/browser/chromeos/input_method/input_method_persistence_unittest.cc
diff --git a/chrome/browser/chromeos/input_method/input_method_persistence_unittest.cc b/chrome/browser/chromeos/input_method/input_method_persistence_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2581070563cc2d488a845232fdc41271c7b52a12
--- /dev/null
+++ b/chrome/browser/chromeos/input_method/input_method_persistence_unittest.cc
@@ -0,0 +1,111 @@
+// 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/chromeos/input_method/input_method_persistence.h"
+
+#include "base/command_line.h"
+#include "chrome/browser/chromeos/input_method/mock_input_method_manager.h"
+#include "chrome/browser/chromeos/language_preferences.h"
+#include "chrome/browser/prefs/pref_service.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/test/base/testing_browser_process.h"
+#include "chrome/test/base/testing_pref_service.h"
+#include "chrome/test/base/testing_profile.h"
+#include "chrome/test/base/testing_profile_manager.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace chromeos {
+namespace input_method {
+
+namespace {
+const char kInputId1[] = "xkb:us:dvorak:eng";
+const char kInputId2[] = "xkb:us:colemak:eng";
+const char kProfileName[] = "input_method_test";
+}
+
+class InputMethodPersistenceTest : public testing::Test {
+ protected:
+  InputMethodPersistenceTest()
+      : mock_profile_manager_(
+          static_cast<TestingBrowserProcess*>(g_browser_process)) {
+  }
+
+  virtual void SetUp() OVERRIDE {
+    // Set up a profile that will be returned by
+    // ProfileManager::GetDefaultProfile().
+    ASSERT_TRUE(mock_profile_manager_.SetUp());
+    TestingProfile* mock_profile =
+        mock_profile_manager_.CreateTestingProfile(kProfileName);
+    CommandLine *cl = CommandLine::ForCurrentProcess();
+    cl->AppendSwitchASCII(switches::kLoginProfile, kProfileName);
+    mock_profile_manager_.SetLoggedIn(true);
+    EXPECT_TRUE(ProfileManager::GetDefaultProfile() != NULL);
+    mock_user_prefs_ = mock_profile->GetTestingPrefService();
+  }
+
+  // Verifies that the user and system prefs contain the expected values.
+  void VerifyPrefs(const std::string& current_input_method,
+                   const std::string& previous_input_method,
+                   const std::string& preferred_keyboard_layout) {
+    EXPECT_EQ(current_input_method,
+              mock_user_prefs_->GetString(prefs::kLanguageCurrentInputMethod));
+    EXPECT_EQ(previous_input_method,
+              mock_user_prefs_->GetString(prefs::kLanguagePreviousInputMethod));
+    EXPECT_EQ(preferred_keyboard_layout,
+              g_browser_process->local_state()->GetString(
+                  language_prefs::kPreferredKeyboardLayout));
+  }
+
+  TestingPrefService* mock_user_prefs_;
+  MockInputMethodManager mock_manager_;
+  TestingProfileManager mock_profile_manager_;
+};
+
+TEST_F(InputMethodPersistenceTest, TestLifetime) {
+  {
+    InputMethodPersistence persistence(&mock_manager_);
+    EXPECT_EQ(1, mock_manager_.add_observer_count_);
+  }
+  EXPECT_EQ(1, mock_manager_.remove_observer_count_);
+}
+
+TEST_F(InputMethodPersistenceTest, TestPrefPersistenceByState) {
+  InputMethodPersistence persistence(&mock_manager_);
+
+  persistence.OnSessionStateChange(InputMethodManager::STATE_LOGIN_SCREEN);
+  mock_manager_.SetCurrentInputMethodId(kInputId1);
+  persistence.InputMethodChanged(&mock_manager_, false);
+  VerifyPrefs("", "", kInputId1);
+
+  persistence.OnSessionStateChange(InputMethodManager::STATE_BROWSER_SCREEN);
+  mock_manager_.SetCurrentInputMethodId(kInputId2);
+  persistence.InputMethodChanged(&mock_manager_, false);
+  VerifyPrefs(kInputId2, "", kInputId1);
+
+  persistence.OnSessionStateChange(InputMethodManager::STATE_LOCK_SCREEN);
+  mock_manager_.SetCurrentInputMethodId(kInputId1);
+  persistence.InputMethodChanged(&mock_manager_, false);
+  VerifyPrefs(kInputId2, "", kInputId1);
+
+  persistence.OnSessionStateChange(InputMethodManager::STATE_TERMINATING);
+  mock_manager_.SetCurrentInputMethodId(kInputId1);
+  persistence.InputMethodChanged(&mock_manager_, false);
+  VerifyPrefs(kInputId2, "", kInputId1);
+
+  persistence.OnSessionStateChange(InputMethodManager::STATE_LOGIN_SCREEN);
+  mock_manager_.SetCurrentInputMethodId(kInputId2);
+  persistence.InputMethodChanged(&mock_manager_, false);
+  VerifyPrefs(kInputId2, "", kInputId2);
+
+  persistence.OnSessionStateChange(InputMethodManager::STATE_BROWSER_SCREEN);
+  mock_manager_.SetCurrentInputMethodId(kInputId1);
+  persistence.InputMethodChanged(&mock_manager_, false);
+  VerifyPrefs(kInputId1, kInputId2, kInputId2);
+}
+
+}  // namespace input_method
+}  // namespace chromeos