base/prefs/scoped_user_pref_update_unittest.cc

   1 // Copyright 2013 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/mock_pref_change_callback.h"
   6 #include "base/prefs/pref_change_registrar.h"
   7 #include "base/prefs/pref_registry_simple.h"
   8 #include "base/prefs/scoped_user_pref_update.h"
   9 #include "base/prefs/testing_pref_service.h"
  10 #include "testing/gmock/include/gmock/gmock.h"
  11 #include "testing/gtest/include/gtest/gtest.h"
  12
  13 using testing::_;
  14 using testing::Mock;
  15
  16 class ScopedUserPrefUpdateTest : public testing::Test {
  17  public:
  18   ScopedUserPrefUpdateTest() : observer_(&prefs_) {}
  19   ~ScopedUserPrefUpdateTest() override {}
  20
  21  protected:
  22   void SetUp() override {
  23     prefs_.registry()->RegisterDictionaryPref(kPref);
  24     registrar_.Init(&prefs_);
  25     registrar_.Add(kPref, observer_.GetCallback());
  26   }
  27
  28   static const char kPref[];
  29   static const char kKey[];
  30   static const char kValue[];
  31
  32   TestingPrefServiceSimple prefs_;
  33   MockPrefChangeCallback observer_;
  34   PrefChangeRegistrar registrar_;
  35 };
  36
  37 const char ScopedUserPrefUpdateTest::kPref[] = "name";
  38 const char ScopedUserPrefUpdateTest::kKey[] = "key";
  39 const char ScopedUserPrefUpdateTest::kValue[] = "value";
  40
  41 TEST_F(ScopedUserPrefUpdateTest, RegularUse) {
  42   // Dictionary that will be expected to be set at the end.
  43   base::DictionaryValue expected_dictionary;
  44   expected_dictionary.SetString(kKey, kValue);
  45
  46   {
  47     EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
  48     DictionaryPrefUpdate update(&prefs_, kPref);
  49     base::DictionaryValue* value = update.Get();
  50     ASSERT_TRUE(value);
  51     value->SetString(kKey, kValue);
  52
  53     // The dictionary was created for us but the creation should have happened
  54     // silently without notifications.
  55     Mock::VerifyAndClearExpectations(&observer_);
  56
  57     // Modifications happen online and are instantly visible, though.
  58     const base::DictionaryValue* current_value = prefs_.GetDictionary(kPref);
  59     ASSERT_TRUE(current_value);
  60     EXPECT_TRUE(expected_dictionary.Equals(current_value));
  61
  62     // Now we are leaving the scope of the update so we should be notified.
  63     observer_.Expect(kPref, &expected_dictionary);
  64   }
  65   Mock::VerifyAndClearExpectations(&observer_);
  66
  67   const base::DictionaryValue* current_value = prefs_.GetDictionary(kPref);
  68   ASSERT_TRUE(current_value);
  69   EXPECT_TRUE(expected_dictionary.Equals(current_value));
  70 }
  71
  72 TEST_F(ScopedUserPrefUpdateTest, NeverTouchAnything) {
  73   const base::DictionaryValue* old_value = prefs_.GetDictionary(kPref);
  74   EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
  75   {
  76     DictionaryPrefUpdate update(&prefs_, kPref);
  77   }
  78   const base::DictionaryValue* new_value = prefs_.GetDictionary(kPref);
  79   EXPECT_EQ(old_value, new_value);
  80   Mock::VerifyAndClearExpectations(&observer_);
  81 }