chrome/browser/chromeos/input_method/ refactoring [part 6 of 6]

chrome/browser/chromeos/preferences_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/chromeos/preferences.h"
+
+#include "chrome/browser/chromeos/input_method/mock_input_method_manager.h"
+#include "chrome/browser/prefs/pref_member.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/test/base/testing_pref_service.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace chromeos {
+namespace {
+
+class MyMockInputMethodManager : public input_method::MockInputMethodManager {
+ public:
+  MyMockInputMethodManager(StringPrefMember* previous,
+                           StringPrefMember* current)
+      : previous_(previous),
+        current_(current) {
+  }
+  virtual ~MyMockInputMethodManager() {
+  }
+
+  virtual bool SetInputMethodConfig(
+      const std::string& section,
+      const std::string& config_name,
+      const input_method::InputMethodConfigValue& value) OVERRIDE {
+    // Assume the preload engines list is "KeyboardC,KeyboardA,KeyboardB".
+    // Switch to the first one, C.
+    ChangeInputMethod("KeyboardC");
+    return true;
+  }
+
+  virtual void ChangeInputMethod(const std::string& input_method_id) OVERRIDE {
+    last_input_method_id_ = input_method_id;
+    // Do the same thing as BrowserStateMonitor::UpdateUserPreferences.
+    const std::string current_input_method_on_pref = current_->GetValue();
+    if (current_input_method_on_pref == input_method_id)
+      return;
+    previous_->SetValue(current_input_method_on_pref);
+    current_->SetValue(input_method_id);
+  }
+
+  std::string last_input_method_id_;
+
+ private:
+  StringPrefMember* previous_;
+  StringPrefMember* current_;
+};
+
+}  // anonymous namespace
+
+TEST(PreferencesTest, TestUpdatePrefOnBrowserScreenDetails) {
+  TestingPrefService prefs;
+  Preferences::RegisterUserPrefs(&prefs);
+
+  StringPrefMember previous;
+  previous.Init(prefs::kLanguagePreviousInputMethod, &prefs, NULL);
+  previous.SetValue("KeyboardA");
+  StringPrefMember current;
+  current.Init(prefs::kLanguageCurrentInputMethod, &prefs, NULL);
+  current.SetValue("KeyboardB");
+
+  MyMockInputMethodManager mock_manager(&previous, &current);
+  Preferences testee(&mock_manager);
+  testee.InitUserPrefsForTesting(&prefs);
+  testee.SetInputMethodListForTesting();
+
+  // Confirm they're unchanged.
+  EXPECT_EQ("KeyboardA", previous.GetValue());
+  EXPECT_EQ("KeyboardB", current.GetValue());
+  EXPECT_EQ("KeyboardB", mock_manager.last_input_method_id_);
+}
+
+}  // namespace chromeos