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// 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/macros.h"
#include "components/prefs/default_pref_store.h"
#include "testing/gtest/include/gtest/gtest.h"
using base::StringValue;
using base::Value;
namespace {
class MockPrefStoreObserver : public PrefStore::Observer {
public:
explicit MockPrefStoreObserver(DefaultPrefStore* pref_store);
~MockPrefStoreObserver() override;
int change_count() {
return change_count_;
}
// PrefStore::Observer implementation:
void OnPrefValueChanged(const std::string& key) override;
void OnInitializationCompleted(bool succeeded) override {}
private:
DefaultPrefStore* pref_store_;
int change_count_;
DISALLOW_COPY_AND_ASSIGN(MockPrefStoreObserver);
};
MockPrefStoreObserver::MockPrefStoreObserver(DefaultPrefStore* pref_store)
: pref_store_(pref_store), change_count_(0) {
pref_store_->AddObserver(this);
}
MockPrefStoreObserver::~MockPrefStoreObserver() {
pref_store_->RemoveObserver(this);
}
void MockPrefStoreObserver::OnPrefValueChanged(const std::string& key) {
change_count_++;
}
} // namespace
TEST(DefaultPrefStoreTest, NotifyPrefValueChanged) {
scoped_refptr<DefaultPrefStore> pref_store(new DefaultPrefStore);
MockPrefStoreObserver observer(pref_store.get());
std::string kPrefKey("pref_key");
// Setting a default value shouldn't send a change notification.
pref_store->SetDefaultValue(kPrefKey,
std::unique_ptr<Value>(new StringValue("foo")));
EXPECT_EQ(0, observer.change_count());
// Replacing the default value should send a change notification...
pref_store->ReplaceDefaultValue(
kPrefKey, std::unique_ptr<Value>(new StringValue("bar")));
EXPECT_EQ(1, observer.change_count());
// But only if the value actually changed.
pref_store->ReplaceDefaultValue(
kPrefKey, std::unique_ptr<Value>(new StringValue("bar")));
EXPECT_EQ(1, observer.change_count());
}
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