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      1 // Copyright (c) 2011 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 "chrome/browser/prefs/scoped_user_pref_update.h"
      6 #include "chrome/browser/prefs/pref_change_registrar.h"
      7 #include "chrome/browser/prefs/pref_observer_mock.h"
      8 #include "chrome/test/testing_pref_service.h"
      9 #include "testing/gmock/include/gmock/gmock.h"
     10 #include "testing/gtest/include/gtest/gtest.h"
     11 
     12 using testing::_;
     13 using testing::Mock;
     14 
     15 class ScopedUserPrefUpdateTest : public testing::Test {
     16  public:
     17   ~ScopedUserPrefUpdateTest() {}
     18 
     19  protected:
     20   virtual void SetUp() {
     21     prefs_.RegisterDictionaryPref(kPref);
     22     registrar_.Init(&prefs_);
     23     registrar_.Add(kPref, &observer_);
     24   }
     25 
     26   static const char kPref[];
     27   static const char kKey[];
     28   static const char kValue[];
     29 
     30   TestingPrefService prefs_;
     31   PrefObserverMock observer_;
     32   PrefChangeRegistrar registrar_;
     33 };
     34 
     35 const char ScopedUserPrefUpdateTest::kPref[] = "name";
     36 const char ScopedUserPrefUpdateTest::kKey[] = "key";
     37 const char ScopedUserPrefUpdateTest::kValue[] = "value";
     38 
     39 TEST_F(ScopedUserPrefUpdateTest, RegularUse) {
     40   // Dictionary that will be expected to be set at the end.
     41   DictionaryValue expected_dictionary;
     42   expected_dictionary.SetString(kKey, kValue);
     43 
     44   {
     45     EXPECT_CALL(observer_, Observe(_, _, _)).Times(0);
     46     DictionaryPrefUpdate update(&prefs_, kPref);
     47     DictionaryValue* value = update.Get();
     48     ASSERT_TRUE(value);
     49     value->SetString(kKey, kValue);
     50 
     51     // The dictionary was created for us but the creation should have happened
     52     // silently without notifications.
     53     Mock::VerifyAndClearExpectations(&observer_);
     54 
     55     // Modifications happen online and are instantly visible, though.
     56     const DictionaryValue* current_value = prefs_.GetDictionary(kPref);
     57     ASSERT_TRUE(current_value);
     58     EXPECT_TRUE(expected_dictionary.Equals(current_value));
     59 
     60     // Now we are leaving the scope of the update so we should be notified.
     61     observer_.Expect(&prefs_, kPref, &expected_dictionary);
     62   }
     63   Mock::VerifyAndClearExpectations(&observer_);
     64 
     65   const DictionaryValue* current_value = prefs_.GetDictionary(kPref);
     66   ASSERT_TRUE(current_value);
     67   EXPECT_TRUE(expected_dictionary.Equals(current_value));
     68 }
     69 
     70 TEST_F(ScopedUserPrefUpdateTest, NeverTouchAnything) {
     71   const DictionaryValue* old_value = prefs_.GetDictionary(kPref);
     72   EXPECT_CALL(observer_, Observe(_, _, _)).Times(0);
     73   {
     74     DictionaryPrefUpdate update(&prefs_, kPref);
     75   }
     76   const DictionaryValue* new_value = prefs_.GetDictionary(kPref);
     77   EXPECT_EQ(old_value, new_value);
     78   Mock::VerifyAndClearExpectations(&observer_);
     79 }
     80