Revert of Move base/prefs to components/prefs

base/prefs/pref_service_unittest.cc

Index: base/prefs/pref_service_unittest.cc
diff --git a/base/prefs/pref_service_unittest.cc b/base/prefs/pref_service_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..649c35fcf7fe9657d78743f013f30d3fb20e9ec6
--- /dev/null
+++ b/base/prefs/pref_service_unittest.cc
@@ -0,0 +1,430 @@
+// 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 <stddef.h>
+#include <stdint.h>
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/prefs/json_pref_store.h"
+#include "base/prefs/mock_pref_change_callback.h"
+#include "base/prefs/pref_change_registrar.h"
+#include "base/prefs/pref_registry_simple.h"
+#include "base/prefs/pref_service_factory.h"
+#include "base/prefs/pref_value_store.h"
+#include "base/prefs/testing_pref_service.h"
+#include "base/prefs/testing_pref_store.h"
+#include "base/values.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using testing::_;
+using testing::Mock;
+
+const char kPrefName[] = "pref.name";
+
+TEST(PrefServiceTest, NoObserverFire) {
+  TestingPrefServiceSimple prefs;
+
+  const char pref_name[] = "homepage";
+  prefs.registry()->RegisterStringPref(pref_name, std::string());
+
+  const char new_pref_value[] = "http://www.google.com/";
+  MockPrefChangeCallback obs(&prefs);
+  PrefChangeRegistrar registrar;
+  registrar.Init(&prefs);
+  registrar.Add(pref_name, obs.GetCallback());
+
+  // This should fire the checks in MockPrefChangeCallback::OnPreferenceChanged.
+  const base::StringValue expected_value(new_pref_value);
+  obs.Expect(pref_name, &expected_value);
+  prefs.SetString(pref_name, new_pref_value);
+  Mock::VerifyAndClearExpectations(&obs);
+
+  // Setting the pref to the same value should not set the pref value a second
+  // time.
+  EXPECT_CALL(obs, OnPreferenceChanged(_)).Times(0);
+  prefs.SetString(pref_name, new_pref_value);
+  Mock::VerifyAndClearExpectations(&obs);
+
+  // Clearing the pref should cause the pref to fire.
+  const base::StringValue expected_default_value((std::string()));
+  obs.Expect(pref_name, &expected_default_value);
+  prefs.ClearPref(pref_name);
+  Mock::VerifyAndClearExpectations(&obs);
+
+  // Clearing the pref again should not cause the pref to fire.
+  EXPECT_CALL(obs, OnPreferenceChanged(_)).Times(0);
+  prefs.ClearPref(pref_name);
+  Mock::VerifyAndClearExpectations(&obs);
+}
+
+TEST(PrefServiceTest, HasPrefPath) {
+  TestingPrefServiceSimple prefs;
+
+  const char path[] = "fake.path";
+
+  // Shouldn't initially have a path.
+  EXPECT_FALSE(prefs.HasPrefPath(path));
+
+  // Register the path. This doesn't set a value, so the path still shouldn't
+  // exist.
+  prefs.registry()->RegisterStringPref(path, std::string());
+  EXPECT_FALSE(prefs.HasPrefPath(path));
+
+  // Set a value and make sure we have a path.
+  prefs.SetString(path, "blah");
+  EXPECT_TRUE(prefs.HasPrefPath(path));
+}
+
+TEST(PrefServiceTest, Observers) {
+  const char pref_name[] = "homepage";
+
+  TestingPrefServiceSimple prefs;
+  prefs.SetUserPref(pref_name,
+                    new base::StringValue("http://www.cnn.com"));
+  prefs.registry()->RegisterStringPref(pref_name, std::string());
+
+  const char new_pref_value[] = "http://www.google.com/";
+  const base::StringValue expected_new_pref_value(new_pref_value);
+  MockPrefChangeCallback obs(&prefs);
+  PrefChangeRegistrar registrar;
+  registrar.Init(&prefs);
+  registrar.Add(pref_name, obs.GetCallback());
+
+  PrefChangeRegistrar registrar_two;
+  registrar_two.Init(&prefs);
+
+  // This should fire the checks in MockPrefChangeCallback::OnPreferenceChanged.
+  obs.Expect(pref_name, &expected_new_pref_value);
+  prefs.SetString(pref_name, new_pref_value);
+  Mock::VerifyAndClearExpectations(&obs);
+
+  // Now try adding a second pref observer.
+  const char new_pref_value2[] = "http://www.youtube.com/";
+  const base::StringValue expected_new_pref_value2(new_pref_value2);
+  MockPrefChangeCallback obs2(&prefs);
+  obs.Expect(pref_name, &expected_new_pref_value2);
+  obs2.Expect(pref_name, &expected_new_pref_value2);
+  registrar_two.Add(pref_name, obs2.GetCallback());
+  // This should fire the checks in obs and obs2.
+  prefs.SetString(pref_name, new_pref_value2);
+  Mock::VerifyAndClearExpectations(&obs);
+  Mock::VerifyAndClearExpectations(&obs2);
+
+  // Set a recommended value.
+  const base::StringValue recommended_pref_value("http://www.gmail.com/");
+  obs.Expect(pref_name, &expected_new_pref_value2);
+  obs2.Expect(pref_name, &expected_new_pref_value2);
+  // This should fire the checks in obs and obs2 but with an unchanged value
+  // as the recommended value is being overridden by the user-set value.
+  prefs.SetRecommendedPref(pref_name, recommended_pref_value.DeepCopy());
+  Mock::VerifyAndClearExpectations(&obs);
+  Mock::VerifyAndClearExpectations(&obs2);
+
+  // Make sure obs2 still works after removing obs.
+  registrar.Remove(pref_name);
+  EXPECT_CALL(obs, OnPreferenceChanged(_)).Times(0);
+  obs2.Expect(pref_name, &expected_new_pref_value);
+  // This should only fire the observer in obs2.
+  prefs.SetString(pref_name, new_pref_value);
+  Mock::VerifyAndClearExpectations(&obs);
+  Mock::VerifyAndClearExpectations(&obs2);
+}
+
+// Make sure that if a preference changes type, so the wrong type is stored in
+// the user pref file, it uses the correct fallback value instead.
+TEST(PrefServiceTest, GetValueChangedType) {
+  const int kTestValue = 10;
+  TestingPrefServiceSimple prefs;
+  prefs.registry()->RegisterIntegerPref(kPrefName, kTestValue);
+
+  // Check falling back to a recommended value.
+  prefs.SetUserPref(kPrefName,
+                    new base::StringValue("not an integer"));
+  const PrefService::Preference* pref = prefs.FindPreference(kPrefName);
+  ASSERT_TRUE(pref);
+  const base::Value* value = pref->GetValue();
+  ASSERT_TRUE(value);
+  EXPECT_EQ(base::Value::TYPE_INTEGER, value->GetType());
+  int actual_int_value = -1;
+  EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
+  EXPECT_EQ(kTestValue, actual_int_value);
+}
+
+TEST(PrefServiceTest, GetValueAndGetRecommendedValue) {
+  const int kDefaultValue = 5;
+  const int kUserValue = 10;
+  const int kRecommendedValue = 15;
+  TestingPrefServiceSimple prefs;
+  prefs.registry()->RegisterIntegerPref(kPrefName, kDefaultValue);
+
+  // Create pref with a default value only.
+  const PrefService::Preference* pref = prefs.FindPreference(kPrefName);
+  ASSERT_TRUE(pref);
+
+  // Check that GetValue() returns the default value.
+  const base::Value* value = pref->GetValue();
+  ASSERT_TRUE(value);
+  EXPECT_EQ(base::Value::TYPE_INTEGER, value->GetType());
+  int actual_int_value = -1;
+  EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
+  EXPECT_EQ(kDefaultValue, actual_int_value);
+
+  // Check that GetRecommendedValue() returns no value.
+  value = pref->GetRecommendedValue();
+  ASSERT_FALSE(value);
+
+  // Set a user-set value.
+  prefs.SetUserPref(kPrefName, new base::FundamentalValue(kUserValue));
+
+  // Check that GetValue() returns the user-set value.
+  value = pref->GetValue();
+  ASSERT_TRUE(value);
+  EXPECT_EQ(base::Value::TYPE_INTEGER, value->GetType());
+  actual_int_value = -1;
+  EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
+  EXPECT_EQ(kUserValue, actual_int_value);
+
+  // Check that GetRecommendedValue() returns no value.
+  value = pref->GetRecommendedValue();
+  ASSERT_FALSE(value);
+
+  // Set a recommended value.
+  prefs.SetRecommendedPref(kPrefName,
+                           new base::FundamentalValue(kRecommendedValue));
+
+  // Check that GetValue() returns the user-set value.
+  value = pref->GetValue();
+  ASSERT_TRUE(value);
+  EXPECT_EQ(base::Value::TYPE_INTEGER, value->GetType());
+  actual_int_value = -1;
+  EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
+  EXPECT_EQ(kUserValue, actual_int_value);
+
+  // Check that GetRecommendedValue() returns the recommended value.
+  value = pref->GetRecommendedValue();
+  ASSERT_TRUE(value);
+  EXPECT_EQ(base::Value::TYPE_INTEGER, value->GetType());
+  actual_int_value = -1;
+  EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
+  EXPECT_EQ(kRecommendedValue, actual_int_value);
+
+  // Remove the user-set value.
+  prefs.RemoveUserPref(kPrefName);
+
+  // Check that GetValue() returns the recommended value.
+  value = pref->GetValue();
+  ASSERT_TRUE(value);
+  EXPECT_EQ(base::Value::TYPE_INTEGER, value->GetType());
+  actual_int_value = -1;
+  EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
+  EXPECT_EQ(kRecommendedValue, actual_int_value);
+
+  // Check that GetRecommendedValue() returns the recommended value.
+  value = pref->GetRecommendedValue();
+  ASSERT_TRUE(value);
+  EXPECT_EQ(base::Value::TYPE_INTEGER, value->GetType());
+  actual_int_value = -1;
+  EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
+  EXPECT_EQ(kRecommendedValue, actual_int_value);
+}
+
+// A PrefStore which just stores the last write flags that were used to write
+// values to it.
+class WriteFlagChecker : public TestingPrefStore {
+ public:
+  WriteFlagChecker() {}
+
+  void ReportValueChanged(const std::string& key, uint32_t flags) override {
+    SetLastWriteFlags(flags);
+  }
+
+  void SetValue(const std::string& key,
+                scoped_ptr<base::Value> value,
+                uint32_t flags) override {
+    SetLastWriteFlags(flags);
+  }
+
+  void SetValueSilently(const std::string& key,
+                        scoped_ptr<base::Value> value,
+                        uint32_t flags) override {
+    SetLastWriteFlags(flags);
+  }
+
+  void RemoveValue(const std::string& key, uint32_t flags) override {
+    SetLastWriteFlags(flags);
+  }
+
+  uint32_t GetLastFlagsAndClear() {
+    CHECK(last_write_flags_set_);
+    uint32_t result = last_write_flags_;
+    last_write_flags_set_ = false;
+    last_write_flags_ = WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS;
+    return result;
+  }
+
+  bool last_write_flags_set() { return last_write_flags_set_; }
+
+ private:
+  ~WriteFlagChecker() override {}
+
+  void SetLastWriteFlags(uint32_t flags) {
+    CHECK(!last_write_flags_set_);
+    last_write_flags_set_ = true;
+    last_write_flags_ = flags;
+  }
+
+  bool last_write_flags_set_ = false;
+  uint32_t last_write_flags_ = WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS;
+};
+
+TEST(PrefServiceTest, WriteablePrefStoreFlags) {
+  scoped_refptr<WriteFlagChecker> flag_checker(new WriteFlagChecker);
+  scoped_refptr<PrefRegistrySimple> registry(new PrefRegistrySimple);
+  base::PrefServiceFactory factory;
+  factory.set_user_prefs(flag_checker);
+  scoped_ptr<PrefService> prefs(factory.Create(registry.get()));
+
+  // The first 8 bits of write flags are reserved for subclasses. Create a
+  // custom flag in this range
+  uint32_t kCustomRegistrationFlag = 1 << 2;
+
+  // A map of the registration flags that will be tested and the write flags
+  // they are expected to convert to.
+  struct RegistrationToWriteFlags {
+    const char* pref_name;
+    uint32_t registration_flags;
+    uint32_t write_flags;
+  };
+  const RegistrationToWriteFlags kRegistrationToWriteFlags[] = {
+      {"none",
+       PrefRegistry::NO_REGISTRATION_FLAGS,
+       WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS},
+      {"lossy",
+       PrefRegistry::LOSSY_PREF,
+       WriteablePrefStore::LOSSY_PREF_WRITE_FLAG},
+      {"custom",
+       kCustomRegistrationFlag,
+       WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS},
+      {"lossyandcustom",
+       PrefRegistry::LOSSY_PREF | kCustomRegistrationFlag,
+       WriteablePrefStore::LOSSY_PREF_WRITE_FLAG}};
+
+  for (size_t i = 0; i < arraysize(kRegistrationToWriteFlags); ++i) {
+    RegistrationToWriteFlags entry = kRegistrationToWriteFlags[i];
+    registry->RegisterDictionaryPref(
+        entry.pref_name, new base::DictionaryValue(), entry.registration_flags);
+
+    SCOPED_TRACE("Currently testing pref with name: " +
+                 std::string(entry.pref_name));
+
+    prefs->GetMutableUserPref(entry.pref_name, base::Value::TYPE_DICTIONARY);
+    EXPECT_TRUE(flag_checker->last_write_flags_set());
+    EXPECT_EQ(entry.write_flags, flag_checker->GetLastFlagsAndClear());
+
+    prefs->ReportUserPrefChanged(entry.pref_name);
+    EXPECT_TRUE(flag_checker->last_write_flags_set());
+    EXPECT_EQ(entry.write_flags, flag_checker->GetLastFlagsAndClear());
+
+    prefs->ClearPref(entry.pref_name);
+    EXPECT_TRUE(flag_checker->last_write_flags_set());
+    EXPECT_EQ(entry.write_flags, flag_checker->GetLastFlagsAndClear());
+
+    prefs->SetUserPrefValue(entry.pref_name, new base::DictionaryValue());
+    EXPECT_TRUE(flag_checker->last_write_flags_set());
+    EXPECT_EQ(entry.write_flags, flag_checker->GetLastFlagsAndClear());
+  }
+}
+
+class PrefServiceSetValueTest : public testing::Test {
+ protected:
+  static const char kName[];
+  static const char kValue[];
+
+  PrefServiceSetValueTest() : observer_(&prefs_) {}
+
+  TestingPrefServiceSimple prefs_;
+  MockPrefChangeCallback observer_;
+};
+
+const char PrefServiceSetValueTest::kName[] = "name";
+const char PrefServiceSetValueTest::kValue[] = "value";
+
+TEST_F(PrefServiceSetValueTest, SetStringValue) {
+  const char default_string[] = "default";
+  const base::StringValue default_value(default_string);
+  prefs_.registry()->RegisterStringPref(kName, default_string);
+
+  PrefChangeRegistrar registrar;
+  registrar.Init(&prefs_);
+  registrar.Add(kName, observer_.GetCallback());
+
+  // Changing the controlling store from default to user triggers notification.
+  observer_.Expect(kName, &default_value);
+  prefs_.Set(kName, default_value);
+  Mock::VerifyAndClearExpectations(&observer_);
+
+  EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
+  prefs_.Set(kName, default_value);
+  Mock::VerifyAndClearExpectations(&observer_);
+
+  base::StringValue new_value(kValue);
+  observer_.Expect(kName, &new_value);
+  prefs_.Set(kName, new_value);
+  Mock::VerifyAndClearExpectations(&observer_);
+}
+
+TEST_F(PrefServiceSetValueTest, SetDictionaryValue) {
+  prefs_.registry()->RegisterDictionaryPref(kName);
+  PrefChangeRegistrar registrar;
+  registrar.Init(&prefs_);
+  registrar.Add(kName, observer_.GetCallback());
+
+  EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
+  prefs_.RemoveUserPref(kName);
+  Mock::VerifyAndClearExpectations(&observer_);
+
+  base::DictionaryValue new_value;
+  new_value.SetString(kName, kValue);
+  observer_.Expect(kName, &new_value);
+  prefs_.Set(kName, new_value);
+  Mock::VerifyAndClearExpectations(&observer_);
+
+  EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
+  prefs_.Set(kName, new_value);
+  Mock::VerifyAndClearExpectations(&observer_);
+
+  base::DictionaryValue empty;
+  observer_.Expect(kName, &empty);
+  prefs_.Set(kName, empty);
+  Mock::VerifyAndClearExpectations(&observer_);
+}
+
+TEST_F(PrefServiceSetValueTest, SetListValue) {
+  prefs_.registry()->RegisterListPref(kName);
+  PrefChangeRegistrar registrar;
+  registrar.Init(&prefs_);
+  registrar.Add(kName, observer_.GetCallback());
+
+  EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
+  prefs_.RemoveUserPref(kName);
+  Mock::VerifyAndClearExpectations(&observer_);
+
+  base::ListValue new_value;
+  new_value.Append(new base::StringValue(kValue));
+  observer_.Expect(kName, &new_value);
+  prefs_.Set(kName, new_value);
+  Mock::VerifyAndClearExpectations(&observer_);
+
+  EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
+  prefs_.Set(kName, new_value);
+  Mock::VerifyAndClearExpectations(&observer_);
+
+  base::ListValue empty;
+  observer_.Expect(kName, &empty);
+  prefs_.Set(kName, empty);
+  Mock::VerifyAndClearExpectations(&observer_);
+}