Added PolicyChangeRegistrar, to observe specific policies at the PolicyService.

chrome/browser/policy/policy_service_unittest.cc

 // 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 "chrome/browser/policy/policy_service_impl.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "chrome/browser/policy/mock_configuration_policy_provider.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::AnyNumber;
 using ::testing::Mock;
 using ::testing::_;
 
 namespace policy {
 
 namespace {
 
 class MockPolicyServiceObserver : public PolicyService::Observer {
  public:
   virtual ~MockPolicyServiceObserver() {}
   MOCK_METHOD4(OnPolicyUpdated, void(PolicyDomain,
                                      const std::string&,
                                      const PolicyMap& previous,
                                      const PolicyMap& current));
 };
 
+class MockPolicyValueObserver : public PolicyChangeRegistrar::Observer {
+ public:
+  virtual ~MockPolicyValueObserver() {}
+  MOCK_METHOD5(OnPolicyValueUpdated, void(PolicyDomain,
+                                          const std::string&,
+                                          const std::string&,
+                                          const Value*,
+                                          const Value*));
+};
+
 // Helper to compare the arguments to an EXPECT_CALL of OnPolicyUpdated() with
 // their expected values.
 MATCHER_P(PolicyEquals, expected, "") {
   return arg.Equals(*expected);
 }
 
+// Helper to compare the arguments to an EXPECT_CALL of OnPolicyValueUpdated()
+// with their expected values.
+MATCHER_P(ValueEquals, expected, "") {
+  return base::Value::Equals(arg, expected);
+}
+
 }  // namespace
 
 class PolicyServiceTest : public testing::Test {
  public:
   PolicyServiceTest() {}
 
   void SetUp() OVERRIDE {
     provider0_.AddMandatoryPolicy("pre", base::Value::CreateIntegerValue(13));
     provider0_.SetInitializationComplete(true);
     provider1_.SetInitializationComplete(true);
     provider2_.SetInitializationComplete(true);
     PolicyServiceImpl::Providers providers;
     providers.push_back(&provider0_);
     providers.push_back(&provider1_);
     providers.push_back(&provider2_);
     policy_service_.reset(new PolicyServiceImpl(providers));
-    policy_service_->AddObserver(POLICY_DOMAIN_CHROME, "", &observer_);
-  }
-
-  void TearDown() OVERRIDE {
-    policy_service_->RemoveObserver(POLICY_DOMAIN_CHROME, "", &observer_);
   }
 
   // Returns true if the policies for |domain|, |component_id| match |expected|.
   bool VerifyPolicies(PolicyDomain domain,
                       const std::string& component_id,
                       const PolicyMap& expected) {
     const PolicyMap* policies =
         policy_service_->GetPolicies(domain, component_id);
     return policies && policies->Equals(expected);
   }
 
  protected:
   MockConfigurationPolicyProvider provider0_;
   MockConfigurationPolicyProvider provider1_;
   MockConfigurationPolicyProvider provider2_;
   scoped_ptr<PolicyServiceImpl> policy_service_;
-  MockPolicyServiceObserver observer_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PolicyServiceTest);
 };
 
 TEST_F(PolicyServiceTest, LoadsPoliciesBeforeProvidersRefresh) {
   PolicyMap expected;
   expected.Set("pre", POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER,
                base::Value::CreateIntegerValue(13));
   EXPECT_TRUE(VerifyPolicies(POLICY_DOMAIN_CHROME, "", expected));
 }
 
 TEST_F(PolicyServiceTest, NotifyObservers) {
+  MockPolicyServiceObserver observer;
+  policy_service_->AddObserver(POLICY_DOMAIN_CHROME, "", &observer);
+
   PolicyMap expectedPrevious;
   expectedPrevious.Set("pre", POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER,
                        base::Value::CreateIntegerValue(13));
 
   PolicyMap expectedCurrent;
   expectedCurrent.CopyFrom(expectedPrevious);
   expectedCurrent.Set("aaa", POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER,
                       base::Value::CreateIntegerValue(123));
   provider0_.AddMandatoryPolicy("aaa", base::Value::CreateIntegerValue(123));
-  EXPECT_CALL(observer_, OnPolicyUpdated(POLICY_DOMAIN_CHROME, "",
-                                         PolicyEquals(&expectedPrevious),
-                                         PolicyEquals(&expectedCurrent)));
+  EXPECT_CALL(observer, OnPolicyUpdated(POLICY_DOMAIN_CHROME, "",
+                                        PolicyEquals(&expectedPrevious),
+                                        PolicyEquals(&expectedCurrent)));
   provider0_.RefreshPolicies();
-  Mock::VerifyAndClearExpectations(&observer_);
+  Mock::VerifyAndClearExpectations(&observer);
 
   // No changes.
-  EXPECT_CALL(observer_, OnPolicyUpdated(_, _, _, _)).Times(0);
+  EXPECT_CALL(observer, OnPolicyUpdated(_, _, _, _)).Times(0);
   provider0_.RefreshPolicies();
-  Mock::VerifyAndClearExpectations(&observer_);
+  Mock::VerifyAndClearExpectations(&observer);
   EXPECT_TRUE(VerifyPolicies(POLICY_DOMAIN_CHROME, "", expectedCurrent));
 
   // New policy.
   expectedPrevious.CopyFrom(expectedCurrent);
   expectedCurrent.Set("bbb", POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER,
                       base::Value::CreateIntegerValue(456));
   provider0_.AddMandatoryPolicy("bbb", base::Value::CreateIntegerValue(456));
-  EXPECT_CALL(observer_, OnPolicyUpdated(POLICY_DOMAIN_CHROME, "",
-                                         PolicyEquals(&expectedPrevious),
-                                         PolicyEquals(&expectedCurrent)));
+  EXPECT_CALL(observer, OnPolicyUpdated(POLICY_DOMAIN_CHROME, "",
+                                        PolicyEquals(&expectedPrevious),
+                                        PolicyEquals(&expectedCurrent)));
   provider0_.RefreshPolicies();
-  Mock::VerifyAndClearExpectations(&observer_);
+  Mock::VerifyAndClearExpectations(&observer);
 
   // Removed policy.
   expectedPrevious.CopyFrom(expectedCurrent);
   expectedCurrent.Erase("bbb");
   provider0_.RemovePolicy("bbb");
-  EXPECT_CALL(observer_, OnPolicyUpdated(POLICY_DOMAIN_CHROME, "",
-                                         PolicyEquals(&expectedPrevious),
-                                         PolicyEquals(&expectedCurrent)));
+  EXPECT_CALL(observer, OnPolicyUpdated(POLICY_DOMAIN_CHROME, "",
+                                        PolicyEquals(&expectedPrevious),
+                                        PolicyEquals(&expectedCurrent)));
   provider0_.RefreshPolicies();
-  Mock::VerifyAndClearExpectations(&observer_);
+  Mock::VerifyAndClearExpectations(&observer);
 
   // Changed policy.
   expectedPrevious.CopyFrom(expectedCurrent);
   expectedCurrent.Set("aaa", POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER,
                       base::Value::CreateIntegerValue(789));
   provider0_.AddMandatoryPolicy("aaa", base::Value::CreateIntegerValue(789));
-  EXPECT_CALL(observer_, OnPolicyUpdated(POLICY_DOMAIN_CHROME, "",
-                                         PolicyEquals(&expectedPrevious),
-                                         PolicyEquals(&expectedCurrent)));
+  EXPECT_CALL(observer, OnPolicyUpdated(POLICY_DOMAIN_CHROME, "",
+                                        PolicyEquals(&expectedPrevious),
+                                        PolicyEquals(&expectedCurrent)));
   provider0_.RefreshPolicies();
-  Mock::VerifyAndClearExpectations(&observer_);
+  Mock::VerifyAndClearExpectations(&observer);
 
   // No changes again.
-  EXPECT_CALL(observer_, OnPolicyUpdated(_, _, _, _)).Times(0);
+  EXPECT_CALL(observer, OnPolicyUpdated(_, _, _, _)).Times(0);
   provider0_.RefreshPolicies();
-  Mock::VerifyAndClearExpectations(&observer_);
+  Mock::VerifyAndClearExpectations(&observer);
   EXPECT_TRUE(VerifyPolicies(POLICY_DOMAIN_CHROME, "", expectedCurrent));
+
+  policy_service_->RemoveObserver(POLICY_DOMAIN_CHROME, "", &observer);
 }
 
 TEST_F(PolicyServiceTest, Priorities) {
   PolicyMap expected;
   expected.Set("pre", POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER,
                base::Value::CreateIntegerValue(13));
-  EXPECT_CALL(observer_, OnPolicyUpdated(_, _, _, _)).Times(AnyNumber());
-
   expected.Set("aaa", POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER,
                base::Value::CreateIntegerValue(0));
   provider0_.AddMandatoryPolicy("aaa", base::Value::CreateIntegerValue(0));
   provider1_.AddMandatoryPolicy("aaa", base::Value::CreateIntegerValue(1));
   provider2_.AddMandatoryPolicy("aaa", base::Value::CreateIntegerValue(2));
   provider0_.RefreshPolicies();
   provider1_.RefreshPolicies();
   provider2_.RefreshPolicies();
   EXPECT_TRUE(VerifyPolicies(POLICY_DOMAIN_CHROME, "", expected));
 
   expected.Set("aaa", POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER,
                base::Value::CreateIntegerValue(1));
   provider0_.RemovePolicy("aaa");
   provider0_.RefreshPolicies();
   EXPECT_TRUE(VerifyPolicies(POLICY_DOMAIN_CHROME, "", expected));
 
   expected.Set("aaa", POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER,
                base::Value::CreateIntegerValue(2));
   provider1_.AddRecommendedPolicy("aaa", base::Value::CreateIntegerValue(1));
   provider1_.RefreshPolicies();
   EXPECT_TRUE(VerifyPolicies(POLICY_DOMAIN_CHROME, "", expected));
 }
 
+TEST_F(PolicyServiceTest, PolicyChangeRegistrar) {
+  MockPolicyValueObserver observer;
+  scoped_ptr<PolicyChangeRegistrar> registrar(
+      new PolicyChangeRegistrar(
+          policy_service_.get(), POLICY_DOMAIN_CHROME, "", &observer));
+
+  // Not observing any policy yet.
+  EXPECT_CALL(observer, OnPolicyValueUpdated(_, _, _, _, _)).Times(0);
+  const base::FundamentalValue kValue0(0);
+  provider0_.AddMandatoryPolicy("aaa", kValue0.DeepCopy());
+  provider0_.RefreshPolicies();
+  Mock::VerifyAndClearExpectations(&observer);
+
+  // Starting to observe existing policies doesn't trigger notification.
+  EXPECT_CALL(observer, OnPolicyValueUpdated(_, _, _, _, _)).Times(0);
+  registrar->Add("aaa");
+  Mock::VerifyAndClearExpectations(&observer);
+
+  // Changing it now triggers a notification.
+  base::FundamentalValue kValue1(1);
+  EXPECT_CALL(observer, OnPolicyValueUpdated(POLICY_DOMAIN_CHROME, "", "aaa",
+                                             ValueEquals(&kValue0),
+                                             ValueEquals(&kValue1)));
+  provider0_.AddMandatoryPolicy("aaa", kValue1.DeepCopy());
+  provider0_.RefreshPolicies();
+  Mock::VerifyAndClearExpectations(&observer);
+
+  // Changing other values doesn't trigger a notification.
+  EXPECT_CALL(observer, OnPolicyValueUpdated(_, _, _, _, _)).Times(0);
+  provider0_.AddMandatoryPolicy("bbb", kValue0.DeepCopy());
+  provider0_.RefreshPolicies();
+  Mock::VerifyAndClearExpectations(&observer);
+
+  // Modifying the value triggers a notification.
+  base::FundamentalValue kValue2(2);
+  EXPECT_CALL(observer, OnPolicyValueUpdated(POLICY_DOMAIN_CHROME, "", "aaa",
+                                             ValueEquals(&kValue1),
+                                             ValueEquals(&kValue2)));
+  provider0_.AddMandatoryPolicy("aaa", kValue2.DeepCopy());
+  provider0_.RefreshPolicies();
+  Mock::VerifyAndClearExpectations(&observer);
+
+  // Removing the value triggers a notification.
+  EXPECT_CALL(observer, OnPolicyValueUpdated(POLICY_DOMAIN_CHROME, "", "aaa",
+                                             ValueEquals(&kValue2),
+                                             NULL));
+  provider0_.RemovePolicy("aaa");
+  provider0_.RefreshPolicies();
+  Mock::VerifyAndClearExpectations(&observer);
+
+  // No more notifications after destroying the registrar.
+  EXPECT_CALL(observer, OnPolicyValueUpdated(_, _, _, _, _)).Times(0);
+  registrar.reset();
+  provider0_.AddMandatoryPolicy("aaa", kValue1.DeepCopy());
+  provider0_.RefreshPolicies();
+  Mock::VerifyAndClearExpectations(&observer);
+}
+
 }  // namespace policy