Implementation of leveldb-backed PrefStore

base/prefs/leveldb_pref_store_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 "base/prefs/leveldb_pref_store.h"
+
+#include "base/file_util.h"
+#include "base/files/scoped_temp_dir.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/path_service.h"
+#include "base/prefs/pref_filter.h"
+#include "base/run_loop.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/values.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+namespace {
+
+class MockPrefStoreObserver : public PrefStore::Observer {
+ public:
+  MOCK_METHOD1(OnPrefValueChanged, void(const std::string&));
+  MOCK_METHOD1(OnInitializationCompleted, void(bool));
+};
+
+class MockReadErrorDelegate : public PersistentPrefStore::ReadErrorDelegate {
+ public:
+  MOCK_METHOD1(OnError, void(PersistentPrefStore::PrefReadError));
+};
+
+}  // namespace
+
+class LevelDBPrefStoreTest : public testing::Test {
+ protected:
+  virtual void SetUp() OVERRIDE {
+    ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
+
+    ASSERT_TRUE(PathService::Get(base::DIR_TEST_DATA, &data_dir_));
+    data_dir_ = data_dir_.AppendASCII("prefs");
+    ASSERT_TRUE(PathExists(data_dir_));
+  }
+
+  void Open() {
+    pref_store_ = new LevelDBPrefStore(
+        temp_dir_.path(), message_loop_.message_loop_proxy().get());
+    EXPECT_EQ(LevelDBPrefStore::PREF_READ_ERROR_NONE, pref_store_->ReadPrefs());
+  }
+
+  void CloseAndReopen() {
+    pref_store_ = NULL;
+    RunLoop().RunUntilIdle();
+    Open();
+  }
+
+  // The path to temporary directory used to contain the test operations.
+  base::ScopedTempDir temp_dir_;
+  // The path to the directory where the test data is stored in the source tree.
+  base::FilePath data_dir_;
+  // A message loop that we can use as the file thread message loop.
+  MessageLoop message_loop_;
+
+  scoped_refptr<LevelDBPrefStore> pref_store_;
+};
+
+TEST_F(LevelDBPrefStoreTest, PutAndGet) {
+  Open();
+  const std::string key = "some.key";
+  pref_store_->SetValue(key, new FundamentalValue(5));
+  RunLoop().RunUntilIdle();
+  FundamentalValue orig_value(5);
+  const base::Value* actual_value;
+  EXPECT_TRUE(pref_store_->GetValue(key, &actual_value));
+  EXPECT_TRUE(orig_value.Equals(actual_value));
+}
+
+TEST_F(LevelDBPrefStoreTest, PutAndGetPersistent) {
+  Open();
+  const std::string key = "some.key";
+  base::Value* value = new FundamentalValue(5);
+  pref_store_->SetValue(key, value);
+  RunLoop().RunUntilIdle();
+
+  CloseAndReopen();
+  const base::Value* actual_value = NULL;
+  FundamentalValue orig_value(5);
+  EXPECT_TRUE(pref_store_->GetValue(key, &actual_value));
+  EXPECT_TRUE(orig_value.Equals(actual_value));
+}
+
+TEST_F(LevelDBPrefStoreTest, BasicObserver) {
+  scoped_refptr<LevelDBPrefStore> pref_store = new LevelDBPrefStore(
+      temp_dir_.path(), message_loop_.message_loop_proxy().get());
+  MockPrefStoreObserver mock_observer;
+  pref_store->AddObserver(&mock_observer);
+  EXPECT_CALL(mock_observer, OnInitializationCompleted(true)).Times(1);
+  EXPECT_EQ(PersistentPrefStore::PREF_READ_ERROR_NONE, pref_store->ReadPrefs());
+  ::testing::Mock::VerifyAndClearExpectations(&mock_observer);
+
+  const std::string key = "some.key";
+  base::Value* value = new FundamentalValue(5);
+  EXPECT_CALL(mock_observer, OnPrefValueChanged(key)).Times(1);
+  pref_store->SetValue(key, value);
+
+  pref_store->RemoveObserver(&mock_observer);
+}
+
+TEST_F(LevelDBPrefStoreTest, SetValueSilently) {
+  Open();
+
+  MockPrefStoreObserver mock_observer;
+  pref_store_->AddObserver(&mock_observer);
+  const std::string key = "some.key";
+  base::Value* value = new FundamentalValue(30);
+  EXPECT_CALL(mock_observer, OnPrefValueChanged(key)).Times(0);
+  pref_store_->SetValueSilently(key, value);
+  RunLoop().RunUntilIdle();
+  pref_store_->RemoveObserver(&mock_observer);
+
+  CloseAndReopen();
+  value = new FundamentalValue(30);
+  const base::Value* actual_value = NULL;
+  EXPECT_TRUE(pref_store_->GetValue(key, &actual_value));
+  EXPECT_TRUE(base::Value::Equals(value, actual_value));
+}
+
+TEST_F(LevelDBPrefStoreTest, GetMutableValue) {
+  Open();
+
+  const std::string key = "some.key";
+  base::DictionaryValue* orig_value = new DictionaryValue;
+  orig_value->SetInteger("key2", 25);
+  pref_store_->SetValue(key, orig_value);
+  base::Value* actual_value;
+
+  EXPECT_TRUE(pref_store_->GetMutableValue(key, &actual_value));
+  EXPECT_TRUE(orig_value->Equals(actual_value));
+  base::DictionaryValue* dict_value =
+      static_cast<base::DictionaryValue*>(actual_value);
+  dict_value->SetInteger("key2", 30);
+  pref_store_->ReportValueChanged(key);
+  RunLoop().RunUntilIdle();
+
+  // Ensure the new value is stored in memory.
+  const base::Value* retrieved_value;
+  EXPECT_TRUE(pref_store_->GetValue(key, &retrieved_value));
+  const base::DictionaryValue* dictionary;
+  EXPECT_TRUE(retrieved_value->GetAsDictionary(&dictionary));
+  const base::Value* inner_value;
+  EXPECT_TRUE(dictionary->Get("key2", &inner_value));
+  int inner_integer;
+  EXPECT_TRUE(inner_value->GetAsInteger(&inner_integer));
+  EXPECT_EQ(30, inner_integer);
+
+  // Ensure the new value is persisted to disk.
+  CloseAndReopen();
+  EXPECT_TRUE(pref_store_->GetValue(key, &retrieved_value));
+  EXPECT_TRUE(retrieved_value->GetAsDictionary(&dictionary));
+  EXPECT_TRUE(dictionary->Get("key2", &inner_value));
+  EXPECT_TRUE(inner_value->GetAsInteger(&inner_integer));
+  EXPECT_EQ(30, inner_integer);
+}
+
+TEST_F(LevelDBPrefStoreTest, Remove) {
+  Open();
+  const std::string key = "some.key";
+  base::Value* orig_value = new FundamentalValue(5);
+  pref_store_->SetValue(key, orig_value);
+  MockPrefStoreObserver mock_observer;
+  pref_store_->AddObserver(&mock_observer);
+  EXPECT_CALL(mock_observer, OnPrefValueChanged(key)).Times(1);
+  pref_store_->RemoveValue(key);
+  pref_store_->RemoveObserver(&mock_observer);
+  RunLoop().RunUntilIdle();
+
+  CloseAndReopen();
+  const base::Value* retrieved_value;
+  EXPECT_FALSE(pref_store_->GetValue(key, &retrieved_value));
+}
+
+TEST_F(LevelDBPrefStoreTest, OpenAsync) {
+  pref_store_ = new LevelDBPrefStore(
+          temp_dir_.path(), message_loop_.message_loop_proxy().get());
+  MockReadErrorDelegate* delegate = new MockReadErrorDelegate;
+  pref_store_->ReadPrefsAsync(delegate);
+  EXPECT_CALL(*delegate,
+      OnError(PersistentPrefStore::PREF_READ_ERROR_NO_FILE)).Times(0);
+  MockPrefStoreObserver mock_observer;
+  pref_store_->AddObserver(&mock_observer);
+  EXPECT_CALL(mock_observer, OnInitializationCompleted(true)).Times(1);
+  RunLoop().RunUntilIdle();
+  pref_store_->RemoveObserver(&mock_observer);
+}
+
+}  // namespace base