1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/prefs/default_pref_store.h"
6#include "testing/gtest/include/gtest/gtest.h"
7
8using base::StringValue;
9using base::Value;
10
11namespace {
12
13class MockPrefStoreObserver : public PrefStore::Observer {
14 public:
15  explicit MockPrefStoreObserver(DefaultPrefStore* pref_store);
16  virtual ~MockPrefStoreObserver();
17
18  int change_count() {
19    return change_count_;
20  }
21
22  // PrefStore::Observer implementation:
23  virtual void OnPrefValueChanged(const std::string& key) OVERRIDE;
24  virtual void OnInitializationCompleted(bool succeeded) OVERRIDE {}
25
26 private:
27  DefaultPrefStore* pref_store_;
28
29  int change_count_;
30
31  DISALLOW_COPY_AND_ASSIGN(MockPrefStoreObserver);
32};
33
34MockPrefStoreObserver::MockPrefStoreObserver(DefaultPrefStore* pref_store)
35    : pref_store_(pref_store), change_count_(0) {
36  pref_store_->AddObserver(this);
37}
38
39MockPrefStoreObserver::~MockPrefStoreObserver() {
40  pref_store_->RemoveObserver(this);
41}
42
43void MockPrefStoreObserver::OnPrefValueChanged(const std::string& key) {
44  change_count_++;
45}
46
47}  // namespace
48
49TEST(DefaultPrefStoreTest, NotifyPrefValueChanged) {
50  scoped_refptr<DefaultPrefStore> pref_store(new DefaultPrefStore);
51  MockPrefStoreObserver observer(pref_store.get());
52  std::string kPrefKey("pref_key");
53
54  // Setting a default value shouldn't send a change notification.
55  pref_store->SetDefaultValue(kPrefKey,
56                              scoped_ptr<Value>(new StringValue("foo")));
57  EXPECT_EQ(0, observer.change_count());
58
59  // Replacing the default value should send a change notification...
60  pref_store->ReplaceDefaultValue(kPrefKey,
61                                  scoped_ptr<Value>(new StringValue("bar")));
62  EXPECT_EQ(1, observer.change_count());
63
64  // But only if the value actually changed.
65  pref_store->ReplaceDefaultValue(kPrefKey,
66                                  scoped_ptr<Value>(new StringValue("bar")));
67  EXPECT_EQ(1, observer.change_count());
68}
69
70