base/prefs/pref_notifier_impl_unittest.cc

   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 "base/bind.h"
   6 #include "base/callback.h"
   7 #include "base/prefs/mock_pref_change_callback.h"
   8 #include "base/prefs/pref_notifier_impl.h"
   9 #include "base/prefs/pref_observer.h"
  10 #include "base/prefs/pref_registry_simple.h"
  11 #include "base/prefs/pref_service.h"
  12 #include "base/prefs/pref_value_store.h"
  13 #include "base/prefs/testing_pref_service.h"
  14 #include "testing/gmock/include/gmock/gmock.h"
  15 #include "testing/gtest/include/gtest/gtest.h"
  16
  17 using testing::_;
  18 using testing::Field;
  19 using testing::Invoke;
  20 using testing::Mock;
  21 using testing::Truly;
  22
  23 namespace {
  24
  25 const char kChangedPref[] = "changed_pref";
  26 const char kUnchangedPref[] = "unchanged_pref";
  27
  28 class MockPrefInitObserver {
  29  public:
  30   MOCK_METHOD1(OnInitializationCompleted, void(bool));
  31 };
  32
  33 // This is an unmodified PrefNotifierImpl, except we make
  34 // OnPreferenceChanged public for tests.
  35 class TestingPrefNotifierImpl : public PrefNotifierImpl {
  36  public:
  37   explicit TestingPrefNotifierImpl(PrefService* service)
  38       : PrefNotifierImpl(service) {
  39   }
  40
  41   // Make public for tests.
  42   using PrefNotifierImpl::OnPreferenceChanged;
  43 };
  44
  45 // Mock PrefNotifier that allows tracking of observers and notifications.
  46 class MockPrefNotifier : public PrefNotifierImpl {
  47  public:
  48   explicit MockPrefNotifier(PrefService* pref_service)
  49       : PrefNotifierImpl(pref_service) {}
  50   virtual ~MockPrefNotifier() {}
  51
  52   MOCK_METHOD1(FireObservers, void(const std::string& path));
  53
  54   size_t CountObserver(const char* path, PrefObserver* obs) {
  55     PrefObserverMap::const_iterator observer_iterator =
  56         pref_observers()->find(path);
  57     if (observer_iterator == pref_observers()->end())
  58       return false;
  59
  60     PrefObserverList* observer_list = observer_iterator->second;
  61     PrefObserverList::Iterator it(*observer_list);
  62     PrefObserver* existing_obs;
  63     size_t count = 0;
  64     while ((existing_obs = it.GetNext()) != NULL) {
  65       if (existing_obs == obs)
  66         count++;
  67     }
  68
  69     return count;
  70   }
  71
  72   // Make public for tests below.
  73   using PrefNotifierImpl::OnPreferenceChanged;
  74   using PrefNotifierImpl::OnInitializationCompleted;
  75 };
  76
  77 class PrefObserverMock : public PrefObserver {
  78  public:
  79   PrefObserverMock() {}
  80   virtual ~PrefObserverMock() {}
  81
  82   MOCK_METHOD2(OnPreferenceChanged, void(PrefService*, const std::string&));
  83 };
  84
  85 // Test fixture class.
  86 class PrefNotifierTest : public testing::Test {
  87  protected:
  88   virtual void SetUp() {
  89     pref_service_.registry()->RegisterBooleanPref(kChangedPref, true);
  90     pref_service_.registry()->RegisterBooleanPref(kUnchangedPref, true);
  91   }
  92
  93   TestingPrefServiceSimple pref_service_;
  94
  95   PrefObserverMock obs1_;
  96   PrefObserverMock obs2_;
  97 };
  98
  99 TEST_F(PrefNotifierTest, OnPreferenceChanged) {
 100   MockPrefNotifier notifier(&pref_service_);
 101   EXPECT_CALL(notifier, FireObservers(kChangedPref)).Times(1);
 102   notifier.OnPreferenceChanged(kChangedPref);
 103 }
 104
 105 TEST_F(PrefNotifierTest, OnInitializationCompleted) {
 106   MockPrefNotifier notifier(&pref_service_);
 107   MockPrefInitObserver observer;
 108   notifier.AddInitObserver(
 109       base::Bind(&MockPrefInitObserver::OnInitializationCompleted,
 110                  base::Unretained(&observer)));
 111   EXPECT_CALL(observer, OnInitializationCompleted(true));
 112   notifier.OnInitializationCompleted(true);
 113 }
 114
 115 TEST_F(PrefNotifierTest, AddAndRemovePrefObservers) {
 116   const char pref_name[] = "homepage";
 117   const char pref_name2[] = "proxy";
 118
 119   MockPrefNotifier notifier(&pref_service_);
 120   notifier.AddPrefObserver(pref_name, &obs1_);
 121   ASSERT_EQ(1u, notifier.CountObserver(pref_name, &obs1_));
 122   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs1_));
 123   ASSERT_EQ(0u, notifier.CountObserver(pref_name, &obs2_));
 124   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs2_));
 125
 126   // Re-adding the same observer for the same pref doesn't change anything.
 127   // Skip this in debug mode, since it hits a DCHECK and death tests aren't
 128   // thread-safe.
 129 #if defined(NDEBUG) && !defined(DCHECK_ALWAYS_ON)
 130   notifier.AddPrefObserver(pref_name, &obs1_);
 131   ASSERT_EQ(1u, notifier.CountObserver(pref_name, &obs1_));
 132   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs1_));
 133   ASSERT_EQ(0u, notifier.CountObserver(pref_name, &obs2_));
 134   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs2_));
 135 #endif
 136
 137   // Ensure that we can add the same observer to a different pref.
 138   notifier.AddPrefObserver(pref_name2, &obs1_);
 139   ASSERT_EQ(1u, notifier.CountObserver(pref_name, &obs1_));
 140   ASSERT_EQ(1u, notifier.CountObserver(pref_name2, &obs1_));
 141   ASSERT_EQ(0u, notifier.CountObserver(pref_name, &obs2_));
 142   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs2_));
 143
 144   // Ensure that we can add another observer to the same pref.
 145   notifier.AddPrefObserver(pref_name, &obs2_);
 146   ASSERT_EQ(1u, notifier.CountObserver(pref_name, &obs1_));
 147   ASSERT_EQ(1u, notifier.CountObserver(pref_name2, &obs1_));
 148   ASSERT_EQ(1u, notifier.CountObserver(pref_name, &obs2_));
 149   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs2_));
 150
 151   // Ensure that we can remove all observers, and that removing a non-existent
 152   // observer is harmless.
 153   notifier.RemovePrefObserver(pref_name, &obs1_);
 154   ASSERT_EQ(0u, notifier.CountObserver(pref_name, &obs1_));
 155   ASSERT_EQ(1u, notifier.CountObserver(pref_name2, &obs1_));
 156   ASSERT_EQ(1u, notifier.CountObserver(pref_name, &obs2_));
 157   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs2_));
 158
 159   notifier.RemovePrefObserver(pref_name, &obs2_);
 160   ASSERT_EQ(0u, notifier.CountObserver(pref_name, &obs1_));
 161   ASSERT_EQ(1u, notifier.CountObserver(pref_name2, &obs1_));
 162   ASSERT_EQ(0u, notifier.CountObserver(pref_name, &obs2_));
 163   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs2_));
 164
 165   notifier.RemovePrefObserver(pref_name, &obs1_);
 166   ASSERT_EQ(0u, notifier.CountObserver(pref_name, &obs1_));
 167   ASSERT_EQ(1u, notifier.CountObserver(pref_name2, &obs1_));
 168   ASSERT_EQ(0u, notifier.CountObserver(pref_name, &obs2_));
 169   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs2_));
 170
 171   notifier.RemovePrefObserver(pref_name2, &obs1_);
 172   ASSERT_EQ(0u, notifier.CountObserver(pref_name, &obs1_));
 173   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs1_));
 174   ASSERT_EQ(0u, notifier.CountObserver(pref_name, &obs2_));
 175   ASSERT_EQ(0u, notifier.CountObserver(pref_name2, &obs2_));
 176 }
 177
 178 TEST_F(PrefNotifierTest, FireObservers) {
 179   TestingPrefNotifierImpl notifier(&pref_service_);
 180   notifier.AddPrefObserver(kChangedPref, &obs1_);
 181   notifier.AddPrefObserver(kUnchangedPref, &obs1_);
 182
 183   EXPECT_CALL(obs1_, OnPreferenceChanged(&pref_service_, kChangedPref));
 184   EXPECT_CALL(obs2_, OnPreferenceChanged(_, _)).Times(0);
 185   notifier.OnPreferenceChanged(kChangedPref);
 186   Mock::VerifyAndClearExpectations(&obs1_);
 187   Mock::VerifyAndClearExpectations(&obs2_);
 188
 189   notifier.AddPrefObserver(kChangedPref, &obs2_);
 190   notifier.AddPrefObserver(kUnchangedPref, &obs2_);
 191
 192   EXPECT_CALL(obs1_, OnPreferenceChanged(&pref_service_, kChangedPref));
 193   EXPECT_CALL(obs2_, OnPreferenceChanged(&pref_service_, kChangedPref));
 194   notifier.OnPreferenceChanged(kChangedPref);
 195   Mock::VerifyAndClearExpectations(&obs1_);
 196   Mock::VerifyAndClearExpectations(&obs2_);
 197
 198   // Make sure removing an observer from one pref doesn't affect anything else.
 199   notifier.RemovePrefObserver(kChangedPref, &obs1_);
 200
 201   EXPECT_CALL(obs1_, OnPreferenceChanged(_, _)).Times(0);
 202   EXPECT_CALL(obs2_, OnPreferenceChanged(&pref_service_, kChangedPref));
 203   notifier.OnPreferenceChanged(kChangedPref);
 204   Mock::VerifyAndClearExpectations(&obs1_);
 205   Mock::VerifyAndClearExpectations(&obs2_);
 206
 207   // Make sure removing an observer entirely doesn't affect anything else.
 208   notifier.RemovePrefObserver(kUnchangedPref, &obs1_);
 209
 210   EXPECT_CALL(obs1_, OnPreferenceChanged(_, _)).Times(0);
 211   EXPECT_CALL(obs2_, OnPreferenceChanged(&pref_service_, kChangedPref));
 212   notifier.OnPreferenceChanged(kChangedPref);
 213   Mock::VerifyAndClearExpectations(&obs1_);
 214   Mock::VerifyAndClearExpectations(&obs2_);
 215
 216   notifier.RemovePrefObserver(kChangedPref, &obs2_);
 217   notifier.RemovePrefObserver(kUnchangedPref, &obs2_);
 218 }
 219
 220 }  // namespace