PreferencesManager

chrome/browser/prefs/preferences_manager_unittest.cc

+// Copyright 2016 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/prefs/preferences_manager.h"
+
+#include "base/macros.h"
+#include "base/run_loop.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+#include "chrome/browser/prefs/browser_prefs.h"
+#include "chrome/test/base/testing_browser_process.h"
+#include "chrome/test/base/testing_profile.h"
+#include "chrome/test/base/testing_profile_manager.h"
+#include "components/pref_registry/pref_registry_syncable.h"
+#include "components/prefs/pref_change_registrar.h"
+#include "components/prefs/pref_service.h"
+#include "components/sync_preferences/testing_pref_service_syncable.h"
+#include "content/public/test/test_browser_thread_bundle.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "services/preferences/public/interfaces/preferences.mojom.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+// Test implementation of prefs::mojom::PreferencesObserver which just tracks
+// calls to OnPreferencesChanged.
+class TestPreferencesObserver : public prefs::mojom::PreferencesObserver {
+ public:
+  TestPreferencesObserver(
+      mojo::InterfaceRequest<prefs::mojom::PreferencesObserver> request)
+      : on_preferences_changed_called_(false),
+        binding_(this, std::move(request)) {}
+  ~TestPreferencesObserver() override {}
+
+  // Returns true is |key| was in the last set of preferences changed.
+  bool KeyReceived(const std::string& key);
+
+  // Clears the values set from the last OnPreferencesChanged.
+  void Reset();
+
+  bool on_preferences_changed_called() {
+    return on_preferences_changed_called_;
+  }
+
+  const base::Value* on_preferences_changed_values() {
+    return on_preferences_changed_values_.get();
+  }
+
+ private:
+  // prefs::mojom::PreferencesObserver:
+  void OnPreferencesChanged(
+      std::unique_ptr<base::DictionaryValue> preferences) override {
+    on_preferences_changed_called_ = true;
+    on_preferences_changed_values_ = std::move(preferences);
+  }
+
+  bool on_preferences_changed_called_;
+  std::unique_ptr<base::Value> on_preferences_changed_values_;
+
+  mojo::Binding<PreferencesObserver> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestPreferencesObserver);
+};
+
+bool TestPreferencesObserver::KeyReceived(const std::string& key) {
+  base::DictionaryValue* dictionary = nullptr;
+  on_preferences_changed_values_->GetAsDictionary(&dictionary);
+  return dictionary->HasKey(key);
+}
+
+void TestPreferencesObserver::Reset() {
+  on_preferences_changed_called_ = false;
+  on_preferences_changed_values_.reset();
+}
+
+}  // namespace
+
+namespace test {
+class PreferencesManagerTest : public testing::Test {
+ public:
+  PreferencesManagerTest();
+  ~PreferencesManagerTest() override;
+
+  // Initializes the connection between |observer_| and |manager_|, subscribing
+  // to changes to |preferences|.
+  void InitObserver(const std::vector<std::string>& preferences);
+
+  // Initializes a preference with |registry_| with a default |value|.
+  void InitPreference(const std::string& key, int value);
+
+  // Has |manager_| update the PrefStore with |preferences|.
+  void SetPreferences(std::unique_ptr<base::DictionaryValue> preferences);
+
+  PreferencesManager* manager() { return manager_.get(); }
+  TestPreferencesObserver* observer() { return observer_.get(); }
+  PrefChangeRegistrar* preferences_change_registrar() {
+    return manager_->preferences_change_registrar_.get();
+  }
+  TestingProfile* profile() { return profile_; }
+  user_prefs::PrefRegistrySyncable* registry() { return registry_; }
+  PrefService* service() { return profile_->GetPrefs(); }
+
+  // testing::Test:
+  void SetUp() override;
+  void TearDown() override;
+
+ private:
+  // Sets up threads needed for |testing_profile_manager_|
+  content::TestBrowserThreadBundle thread_bundle_;
+
+  // Handles creation of profiles for testing.
+  TestingProfileManager testing_profile_manager_;
+
+  // Not owned
+  TestingProfile* profile_;
+  user_prefs::PrefRegistrySyncable* registry_;
+
+  prefs::mojom::PreferencesObserverPtr proxy_;
+  std::unique_ptr<TestPreferencesObserver> observer_;
+  std::unique_ptr<PreferencesManager> manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(PreferencesManagerTest);
+};
+
+PreferencesManagerTest::PreferencesManagerTest()
+    : testing_profile_manager_(TestingBrowserProcess::GetGlobal()) {}
+
+PreferencesManagerTest::~PreferencesManagerTest() {}
+
+void PreferencesManagerTest::InitObserver(
+    const std::vector<std::string>& preferences) {
+  manager_->Subscribe(preferences);
+  base::RunLoop().RunUntilIdle();
+}
+
+void PreferencesManagerTest::InitPreference(const std::string& key, int value) {
+  registry_->RegisterIntegerPref(key, value);
+  base::FundamentalValue fundamental_value(value);
+  profile_->GetPrefs()->Set(key, fundamental_value);
+}
+
+void PreferencesManagerTest::SetPreferences(
+    std::unique_ptr<base::DictionaryValue> preferences) {
+  manager_->SetPreferences(std::move(preferences));
+  base::RunLoop().RunUntilIdle();
+}
+
+void PreferencesManagerTest::SetUp() {
+  ASSERT_TRUE(testing_profile_manager_.SetUp());
+
+  std::unique_ptr<sync_preferences::TestingPrefServiceSyncable> service(
+      base::MakeUnique<sync_preferences::TestingPrefServiceSyncable>());
+  registry_ = service->registry();
+  chrome::RegisterUserProfilePrefs(registry_);
+
+  const std::string kName = "navi";
+  profile_ = testing_profile_manager_.CreateTestingProfile(
+      kName, std::move(service), base::UTF8ToUTF16(kName), 0, std::string(),
+      TestingProfile::TestingFactories());
+  ASSERT_NE(nullptr, profile_->GetPrefs());
+
+  observer_.reset(new TestPreferencesObserver(mojo::MakeRequest(&proxy_)));
+  manager_ = base::MakeUnique<PreferencesManager>(profile_);
+  ASSERT_TRUE(manager_->preferences_change_registrar_->IsEmpty());
+  manager_->AddObserver(std::move(proxy_));
+}
+
+void PreferencesManagerTest::TearDown() {
+  testing_profile_manager_.DeleteAllTestingProfiles();
+}
+
+// Tests that when the PrefService is empty that no subscriptions are made.
+TEST_F(PreferencesManagerTest, EmptyService) {
+  const std::string kKey = "hey";
+  std::vector<std::string> preferences;
+  preferences.push_back(kKey);
+  InitObserver(preferences);
+  EXPECT_FALSE(preferences_change_registrar()->IsObserved(kKey));
+  EXPECT_FALSE(observer()->on_preferences_changed_called());
+}
+
+// Tests that when the PrefService has the desired key, that a subscription is
+// setup and that the PreferenceObserver is notified.
+TEST_F(PreferencesManagerTest, ServiceHasValues) {
+  const std::string kKey = "hey";
+  const int kValue = 42;
+  InitPreference(kKey, kValue);
+
+  std::vector<std::string> preferences;
+  preferences.push_back(kKey);
+  InitObserver(preferences);
+  EXPECT_TRUE(preferences_change_registrar()->IsObserved(kKey));
+  EXPECT_TRUE(observer()->on_preferences_changed_called());
+  EXPECT_TRUE(observer()->KeyReceived(kKey));
+}
+
+// Tests that mulitple keys can be subscribed to.
+TEST_F(PreferencesManagerTest, MultipleSubscriptions) {
+  const std::string kKey1 = "hey";
+  const int kValue1 = 42;
+  InitPreference(kKey1, kValue1);
+
+  const std::string kKey2 = "listen";
+  const int kValue2 = 9001;
+  InitPreference(kKey2, kValue2);
+
+  std::vector<std::string> preferences;
+  preferences.push_back(kKey1);
+  preferences.push_back(kKey2);
+  InitObserver(preferences);
+  EXPECT_TRUE(preferences_change_registrar()->IsObserved(kKey1));
+  EXPECT_TRUE(preferences_change_registrar()->IsObserved(kKey2));
+  EXPECT_TRUE(observer()->KeyReceived(kKey1));
+  EXPECT_TRUE(observer()->KeyReceived(kKey2));
+}
+
+// Tests that when all keys are not in the PrefService that subscriptions are
+// set for the available key.
+TEST_F(PreferencesManagerTest, PartialSubsriptionAvailable) {
+  const std::string kKey1 = "hey";
+  const int kValue1 = 42;
+  InitPreference(kKey1, kValue1);
+
+  const std::string kKey2 = "listen";
+  std::vector<std::string> preferences;
+  preferences.push_back(kKey1);
+  preferences.push_back(kKey2);
+  InitObserver(preferences);
+  EXPECT_TRUE(preferences_change_registrar()->IsObserved(kKey1));
+  EXPECT_FALSE(preferences_change_registrar()->IsObserved(kKey2));
+  EXPECT_TRUE(observer()->KeyReceived(kKey1));
+  EXPECT_FALSE(observer()->KeyReceived(kKey2));
+}
+
+// Tests that when a preference is changed that the PreferenceObserver is
+// notified.
+TEST_F(PreferencesManagerTest, PreferenceChanged) {
+  const std::string kKey = "hey";
+  const int kValue = 42;
+  InitPreference(kKey, kValue);
+
+  std::vector<std::string> preferences;
+  preferences.push_back(kKey);
+  InitObserver(preferences);
+  observer()->Reset();
+
+  const int kNewValue = 1337;
+  service()->SetInteger(kKey, kNewValue);
+  base::RunLoop().RunUntilIdle();
+
+  EXPECT_TRUE(observer()->on_preferences_changed_called());
+  const base::Value* values = observer()->on_preferences_changed_values();
+  const base::DictionaryValue* dictionary = nullptr;
+  values->GetAsDictionary(&dictionary);
+  int result = 0;
+  dictionary->GetInteger(kKey, &result);
+  EXPECT_EQ(kNewValue, result);
+}
+
+// Tests that when a non subscribed preference is changed that the
+// PreferenceObserver is not notified.
+TEST_F(PreferencesManagerTest, UnrelatedPreferenceChanged) {
+  const std::string kKey1 = "hey";
+  const int kValue1 = 42;
+  InitPreference(kKey1, kValue1);
+
+  const std::string kKey2 = "listen";
+  const int kValue2 = 9001;
+  InitPreference(kKey2, kValue2);
+
+  std::vector<std::string> preferences;
+  preferences.push_back(kKey1);
+  InitObserver(preferences);
+  observer()->Reset();
+
+  const int kNewValue = 1337;
+  service()->SetInteger(kKey2, kNewValue);
+  base::RunLoop().RunUntilIdle();
+
+  EXPECT_FALSE(observer()->on_preferences_changed_called());
+}
+
+// Tests that when the PreferenceManager updates a preference that the
+// PreferenceObserver is not notified.
+TEST_F(PreferencesManagerTest, NoNotificationsForSelfChange) {
+  const std::string kKey = "hey";
+  const int kValue = 42;
+  InitPreference(kKey, kValue);
+
+  std::vector<std::string> preferences;
+  preferences.push_back(kKey);
+  InitObserver(preferences);
+  observer()->Reset();
+
+  const int kNewValue = 1337;
+  std::unique_ptr<base::DictionaryValue> dictionary =
+      base::MakeUnique<base::DictionaryValue>();
+  dictionary->SetInteger(kKey, kNewValue);
+  SetPreferences(std::move(dictionary));
+
+  EXPECT_FALSE(observer()->on_preferences_changed_called());
+  EXPECT_EQ(kNewValue, service()->GetInteger(kKey));
+}
+
+}  // namespace test