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      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 
      8 using base::StringValue;
      9 using base::Value;
     10 
     11 namespace {
     12 
     13 class 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 
     34 MockPrefStoreObserver::MockPrefStoreObserver(DefaultPrefStore* pref_store)
     35     : pref_store_(pref_store), change_count_(0) {
     36   pref_store_->AddObserver(this);
     37 }
     38 
     39 MockPrefStoreObserver::~MockPrefStoreObserver() {
     40   pref_store_->RemoveObserver(this);
     41 }
     42 
     43 void MockPrefStoreObserver::OnPrefValueChanged(const std::string& key) {
     44   change_count_++;
     45 }
     46 
     47 }  // namespace
     48 
     49 TEST(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