Implement cloud policy invalidations using the invalidation service framework.

chrome/browser/policy/cloud/cloud_policy_invalidator_unittest.cc

+// Copyright (c) 2013 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 <string>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_samples.h"
+#include "base/metrics/sample_map.h"
+#include "base/metrics/statistics_recorder.h"
+#include "base/test/test_simple_task_runner.h"
+#include "base/time/time.h"
+#include "base/values.h"
+#include "chrome/browser/invalidation/fake_invalidation_service.h"
+#include "chrome/browser/policy/cloud/cloud_policy_core.h"
+#include "chrome/browser/policy/cloud/cloud_policy_invalidator.h"
+#include "chrome/browser/policy/cloud/cloud_policy_service.h"
+#include "chrome/browser/policy/cloud/enterprise_metrics.h"
+#include "chrome/browser/policy/cloud/mock_cloud_policy_client.h"
+#include "chrome/browser/policy/cloud/mock_cloud_policy_store.h"
+#include "chrome/browser/policy/policy_types.h"
+#include "chrome/browser/policy/proto/cloud/device_management_backend.pb.h"
+#include "policy/policy_constants.h"
+#include "sync/notifier/invalidation_util.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace policy {
+
+class CloudPolicyInvalidatorTest : public testing::Test,
+                                   public CloudPolicyInvalidationHandler {
+ protected:
+  // Policy objects which can be used in tests.
+  enum PolicyObject {
+    POLICY_OBJECT_NONE,
+    POLICY_OBJECT_A,
+    POLICY_OBJECT_B
+  };
+
+  CloudPolicyInvalidatorTest();
+
+  virtual void SetUp() OVERRIDE;
+
+  virtual void TearDown() OVERRIDE;
+
+  // Starts the invalidator which will be tested.
+  void StartInvalidator(bool initialize);
+  void StartInvalidator() {
+    StartInvalidator(true /* initialize */);
+  }
+
+  // Simulates storing a new policy to the policy store.
+  // |object| determines which policy object the store will report the
+  // invalidator should register for. May be POLICY_OBJECT_NONE for no object.
+  // |invalidation_version| determines what invalidation the store will report.
+  // |policy_changed| determines whether the store will report that the
+  // policy changed.
+  // |timestamp| determines the response timestamp the store will report.
+  void StorePolicy(
+      PolicyObject object,
+      int64 invalidation_version,
+      bool policy_changed,
+      int64 timestamp);
+  void StorePolicy(
+      PolicyObject object,
+      int64 invalidation_version,
+      bool policy_changed) {
+    StorePolicy(object, invalidation_version, policy_changed, ++timestamp_);
+  }
+  void StorePolicy(PolicyObject object, int64 invalidation_version) {
+    StorePolicy(object, invalidation_version, false);
+  }
+  void StorePolicy(PolicyObject object) {
+    StorePolicy(object, 0);
+  }
+
+  // Disables the invalidation service. It is enabled by default.
+  void DisableInvalidationService();
+
+  // Enables the invalidation service. It is enabled by default.
+  void EnableInvalidationService();
+
+  // Causes the invalidation service to fire an invalidation. Returns an ack
+  // handle which be used to verify that the invalidation was acknowledged.
+  syncer::AckHandle FireInvalidation(
+      PolicyObject object,
+      int64 version,
+      const std::string& payload);
+
+  // Causes the invalidation service to fire an invalidation with unknown
+  // version. Returns an ack handle which be used to verify that the
+  // invalidation was acknowledged.
+  syncer::AckHandle FireInvalidation(PolicyObject object);
+
+  // Checks the expected value of the currently set invalidation info.
+  bool CheckInvalidationInfo(int64 version, const std::string& payload);
+
+  // Checks that the invalidate callback was not called.
+  bool CheckInvalidateNotCalled();
+
+  // Checks that the invalidate callback was called within an appropriate
+  // timeframe depending on whether the invalidation had unknown version.
+  bool CheckInvalidateCalled(bool unknown_version);
+  bool CheckInvalidateCalled() {
+    return CheckInvalidateCalled(true);
+  }
+
+  // Checks that the state changed callback of the invalidation handler was not
+  // called.
+  bool CheckStateChangedNotCalled();
+
+  // Checks that the state changed callback of the invalidation handler was
+  // called with the given state.
+  bool CheckStateChangedCalled(bool invalidations_enabled);
+
+  // Determines if the invalidation with the given ack handle has been
+  // acknowledged.
+  bool IsInvalidationAcknowledged(const syncer::AckHandle& ack_handle);
+
+  // Get the current count for the given metric.
+  base::HistogramBase::Count GetCount(MetricPolicyRefresh metric);
+  base::HistogramBase::Count GetCount(MetricPolicyInvalidations metric);
+
+  // CloudPolicyInvalidationHandler:
+  virtual void SetInvalidationInfo(
+      int64 version,
+      const std::string& payload) OVERRIDE;
+  virtual void InvalidatePolicy() OVERRIDE;
+  virtual void OnInvalidatorStateChanged(bool invalidations_enabled) OVERRIDE;
+
+ private:
+  // Returns the object id of the given policy object.
+  const invalidation::ObjectId& GetPolicyObjectId(PolicyObject object) const;
+
+  // Get histogram samples for the given histogram.
+  scoped_ptr<base::HistogramSamples> GetHistogramSamples(
+      const std::string& name) const;
+
+  // Objects the invalidator depends on.
+  invalidation::FakeInvalidationService invalidation_service_;
+  MockCloudPolicyStore store_;
+  scoped_refptr<base::TestSimpleTaskRunner> task_runner_;
+
+  // The invalidator which will be tested.
+  scoped_ptr<CloudPolicyInvalidator> invalidator_;
+
+  // The latest invalidation info set by the invalidator.
+  int64 invalidation_version_;
+  std::string invalidation_payload_;
+
+  // Object ids for the test policy objects.
+  invalidation::ObjectId object_id_a_;
+  invalidation::ObjectId object_id_b_;
+
+  // Increasing policy timestamp.
+  int64 timestamp_;
+
+  // Fake policy values which are alternated to cause the store to report a
+  // changed policy.
+  const char* policy_value_a_;
+  const char* policy_value_b_;
+
+  // The currently used policy value.
+  const char* policy_value_cur_;
+
+  // Stores how many times the invalidate callback was called.
+  int invalidate_callback_count_;
+
+  // Stores how many times the state change callback was called for each state.
+  int state_change_enabled_callback_count_;
+  int state_change_disabled_callback_count_;
+
+  // Stores starting histogram counts for kMetricPolicyRefresh.
+  scoped_ptr<base::HistogramSamples> refresh_samples_;
+
+  // Stores starting histogram counts for kMetricPolicyInvalidations.
+  scoped_ptr<base::HistogramSamples> invalidations_samples_;
+};
+
+CloudPolicyInvalidatorTest::CloudPolicyInvalidatorTest()
+    : task_runner_(new base::TestSimpleTaskRunner()),
+      invalidation_version_(0),
+      object_id_a_(135, "asdf"),
+      object_id_b_(246, "zxcv"),
+      timestamp_(123456),
+      policy_value_a_("asdf"),
+      policy_value_b_("zxcv"),
+      policy_value_cur_(policy_value_a_),
+      invalidate_callback_count_(0),
+      state_change_enabled_callback_count_(0),
+      state_change_disabled_callback_count_(0) {}
+
+void CloudPolicyInvalidatorTest::SetUp() {
+  base::StatisticsRecorder::Initialize();
+  refresh_samples_ = GetHistogramSamples(kMetricPolicyRefresh);
+  invalidations_samples_ = GetHistogramSamples(kMetricPolicyInvalidations);
+}
+
+void CloudPolicyInvalidatorTest::TearDown() {
+  EXPECT_FALSE(invalidation_service_.ReceivedInvalidAcknowledgement());
+  if (invalidator_)
+    invalidator_->Shutdown();
+}
+
+void CloudPolicyInvalidatorTest::StartInvalidator(bool initialize) {
+  invalidator_.reset(new CloudPolicyInvalidator(
+      this /* invalidation_handler */,
+      &store_,
+      task_runner_));
+  if (initialize)
+    invalidator_->InitializeWithService(&invalidation_service_);
+}
+
+void CloudPolicyInvalidatorTest::StorePolicy(
+    PolicyObject object,
+    int64 invalidation_version,
+    bool policy_changed,
+    int64 timestamp) {
+  enterprise_management::PolicyData* data =
+      new enterprise_management::PolicyData();
+  if (object != POLICY_OBJECT_NONE) {
+    data->set_invalidation_source(GetPolicyObjectId(object).source());
+    data->set_invalidation_name(GetPolicyObjectId(object).name());
+  }
+  data->set_timestamp(timestamp);
+  // Swap the policy value if a policy change is desired.
+  if (policy_changed)
+    policy_value_cur_ = policy_value_cur_ == policy_value_a_ ?
+        policy_value_b_ : policy_value_a_;
+  data->set_policy_value(policy_value_cur_);
+  store_.invalidation_version_ = invalidation_version;
+  store_.policy_.reset(data);
+  base::DictionaryValue policies;
+  policies.SetInteger(
+      key::kMaxInvalidationFetchDelay,
+      CloudPolicyInvalidator::kMaxFetchDelayMin);
+  store_.policy_map_.LoadFrom(
+      &policies,
+      POLICY_LEVEL_MANDATORY,
+      POLICY_SCOPE_MACHINE);
+  store_.NotifyStoreLoaded();
+}
+
+void CloudPolicyInvalidatorTest::DisableInvalidationService() {
+  invalidation_service_.SetInvalidatorState(
+      syncer::TRANSIENT_INVALIDATION_ERROR);
+}
+
+void CloudPolicyInvalidatorTest::EnableInvalidationService() {
+  invalidation_service_.SetInvalidatorState(syncer::INVALIDATIONS_ENABLED);
+}
+
+syncer::AckHandle CloudPolicyInvalidatorTest::FireInvalidation(
+    PolicyObject object,
+    int64 version,
+    const std::string& payload) {
+  return invalidation_service_.EmitInvalidationForTest(
+      GetPolicyObjectId(object),
+      version,
+      payload);
+}
+
+syncer::AckHandle CloudPolicyInvalidatorTest::FireInvalidation(
+    PolicyObject object) {
+  return invalidation_service_.EmitInvalidationForTest(
+      GetPolicyObjectId(object),
+      syncer::Invalidation::kUnknownVersion,
+      std::string());
+}
+
+bool CloudPolicyInvalidatorTest::CheckInvalidationInfo(
+    int64 version,
+    const std::string& payload) {
+  return version == invalidation_version_ && payload == invalidation_payload_;
+}
+
+bool CloudPolicyInvalidatorTest::CheckInvalidateNotCalled() {
+  bool result = true;
+  if (invalidate_callback_count_ != 0)
+    result = false;
+  task_runner_->RunUntilIdle();
+  if (invalidate_callback_count_ != 0)
+    result = false;
+  return result;
+}
+
+bool CloudPolicyInvalidatorTest::CheckInvalidateCalled(bool unknown_version) {
+  base::TimeDelta min_delay;
+  base::TimeDelta max_delay = base::TimeDelta::FromMilliseconds(
+      CloudPolicyInvalidator::kMaxFetchDelayMin);
+  if (unknown_version) {
+    base::TimeDelta additional_delay = base::TimeDelta::FromMinutes(
+        CloudPolicyInvalidator::kMissingPayloadDelay);
+    min_delay += additional_delay;
+    max_delay += additional_delay;
+  }
+
+  if (task_runner_->GetPendingTasks().empty())
+    return false;
+  base::TimeDelta actual_delay = task_runner_->GetPendingTasks().back().delay;
+  EXPECT_GE(actual_delay, min_delay);
+  EXPECT_LE(actual_delay, max_delay);
+
+  bool result = true;
+  if (invalidate_callback_count_ != 0)
+    result = false;
+  task_runner_->RunUntilIdle();
+  if (invalidate_callback_count_ != 1)
+    result = false;
+  invalidate_callback_count_ = 0;
+  return result;
+}
+
+bool CloudPolicyInvalidatorTest::CheckStateChangedNotCalled() {
+  return state_change_enabled_callback_count_ == 0 &&
+      state_change_disabled_callback_count_ == 0;
+}
+
+bool CloudPolicyInvalidatorTest::CheckStateChangedCalled(
+    bool invalidations_enabled) {
+  int expected_enabled_count_ = invalidations_enabled ? 1 : 0;
+  int expected_disabled_count_ = invalidations_enabled ? 0 : 1;
+  bool result = state_change_enabled_callback_count_ == expected_enabled_count_
+      && state_change_disabled_callback_count_ == expected_disabled_count_;
+  state_change_enabled_callback_count_ = 0;
+  state_change_disabled_callback_count_ = 0;
+  return result;
+}
+
+bool CloudPolicyInvalidatorTest::IsInvalidationAcknowledged(
+    const syncer::AckHandle& ack_handle) {
+  return invalidation_service_.IsInvalidationAcknowledged(ack_handle);
+}
+
+base::HistogramBase::Count CloudPolicyInvalidatorTest::GetCount(
+    MetricPolicyRefresh metric) {
+  return GetHistogramSamples(kMetricPolicyRefresh)->GetCount(metric) -
+      refresh_samples_->GetCount(metric);
+}
+
+base::HistogramBase::Count CloudPolicyInvalidatorTest::GetCount(
+    MetricPolicyInvalidations metric) {
+  return GetHistogramSamples(kMetricPolicyInvalidations)->GetCount(metric) -
+      invalidations_samples_->GetCount(metric);
+}
+
+void CloudPolicyInvalidatorTest::SetInvalidationInfo(
+    int64 version,
+    const std::string& payload) {
+  invalidation_version_ = version;
+  invalidation_payload_ = payload;
+}
+
+void CloudPolicyInvalidatorTest::InvalidatePolicy() {
+  ++invalidate_callback_count_;
+}
+
+void CloudPolicyInvalidatorTest::OnInvalidatorStateChanged(
+    bool invalidations_enabled) {
+  if (invalidator_.get())
+    EXPECT_EQ(invalidations_enabled, invalidator_->invalidations_enabled());
+  if (invalidations_enabled)
+    ++state_change_enabled_callback_count_;
+  else
+    ++state_change_disabled_callback_count_;
+}
+
+const invalidation::ObjectId& CloudPolicyInvalidatorTest::GetPolicyObjectId(
+    PolicyObject object) const {
+  EXPECT_TRUE(object == POLICY_OBJECT_A || object == POLICY_OBJECT_B);
+  return object == POLICY_OBJECT_A ? object_id_a_ : object_id_b_;
+}
+
+scoped_ptr<base::HistogramSamples>
+    CloudPolicyInvalidatorTest::GetHistogramSamples(
+        const std::string& name) const {
+  base::HistogramBase* histogram =
+      base::StatisticsRecorder::FindHistogram(name);
+  if (!histogram)
+    return scoped_ptr<base::HistogramSamples>(new base::SampleMap());
+  return histogram->SnapshotSamples();
+}
+
+TEST_F(CloudPolicyInvalidatorTest, Uninitialized) {
+  // No invalidations should be processed if the invalidator is not intialized.
+  StartInvalidator(false /* initialize */);
+  StorePolicy(POLICY_OBJECT_A);
+  FireInvalidation(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckInvalidateNotCalled());
+}
+
+TEST_F(CloudPolicyInvalidatorTest, RegisterOnStoreLoaded) {
+  // No registration when store is not loaded.
+  StartInvalidator();
+  EXPECT_TRUE(CheckStateChangedNotCalled());
+  FireInvalidation(POLICY_OBJECT_A);
+  FireInvalidation(POLICY_OBJECT_B);
+  EXPECT_TRUE(CheckInvalidateNotCalled());
+
+  // No registration when store is loaded with no invalidation object id.
+  StorePolicy(POLICY_OBJECT_NONE);
+  EXPECT_TRUE(CheckStateChangedNotCalled());
+  FireInvalidation(POLICY_OBJECT_A);
+  FireInvalidation(POLICY_OBJECT_B);
+  EXPECT_TRUE(CheckInvalidateNotCalled());
+
+  // Check registration when store is loaded for object A.
+  StorePolicy(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckStateChangedCalled(true));
+  FireInvalidation(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckInvalidateCalled());
+  FireInvalidation(POLICY_OBJECT_B);
+  EXPECT_TRUE(CheckInvalidateNotCalled());
+}
+
+TEST_F(CloudPolicyInvalidatorTest, ChangeRegistration) {
+  // Register for object A.
+  StartInvalidator();
+  StorePolicy(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckStateChangedCalled(true));
+  FireInvalidation(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckInvalidateCalled());
+  FireInvalidation(POLICY_OBJECT_B);
+  EXPECT_TRUE(CheckInvalidateNotCalled());
+  syncer::AckHandle ack = FireInvalidation(POLICY_OBJECT_A);
+
+  // Check re-registration for object B. Make sure the pending invalidation for
+  // object A is acknowledged without making the callback.
+  StorePolicy(POLICY_OBJECT_B);
+  EXPECT_TRUE(CheckStateChangedNotCalled());
+  EXPECT_TRUE(IsInvalidationAcknowledged(ack));
+  EXPECT_TRUE(CheckInvalidateNotCalled());
+
+  // Make sure future invalidations for object A are ignored and for object B
+  // are processed.
+  FireInvalidation(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckInvalidateNotCalled());
+  FireInvalidation(POLICY_OBJECT_B);
+  EXPECT_TRUE(CheckInvalidateCalled());
+}
+
+TEST_F(CloudPolicyInvalidatorTest, UnregisterOnStoreLoaded) {
+  // Register for object A.
+  StartInvalidator();
+  StorePolicy(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckStateChangedCalled(true));
+  FireInvalidation(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckInvalidateCalled());
+
+  // Check unregistration when store is loaded with no invalidation object id.
+  syncer::AckHandle ack = FireInvalidation(POLICY_OBJECT_A);
+  EXPECT_FALSE(IsInvalidationAcknowledged(ack));
+  StorePolicy(POLICY_OBJECT_NONE);
+  EXPECT_TRUE(IsInvalidationAcknowledged(ack));
+  EXPECT_TRUE(CheckStateChangedCalled(false));
+  FireInvalidation(POLICY_OBJECT_A);
+  FireInvalidation(POLICY_OBJECT_B);
+  EXPECT_TRUE(CheckInvalidateNotCalled());
+
+  // Check re-registration for object B.
+  StorePolicy(POLICY_OBJECT_B);
+  EXPECT_TRUE(CheckStateChangedCalled(true));
+  FireInvalidation(POLICY_OBJECT_B);
+  EXPECT_TRUE(CheckInvalidateCalled());
+}
+
+TEST_F(CloudPolicyInvalidatorTest, HandleInvalidation) {
+  // Register and fire invalidation
+  StorePolicy(POLICY_OBJECT_A);
+  StartInvalidator();
+  EXPECT_TRUE(CheckStateChangedCalled(true));
+  syncer::AckHandle ack = FireInvalidation(POLICY_OBJECT_A, 12, "test_payload");
+
+  // Make sure client info is set as soon as the invalidation is received.
+  EXPECT_TRUE(CheckInvalidationInfo(12, "test_payload"));
+  EXPECT_TRUE(CheckInvalidateCalled(false /* unknown_version */));
+
+  // Make sure invalidation is not acknowledged until the store is loaded.
+  EXPECT_FALSE(IsInvalidationAcknowledged(ack));
+  EXPECT_TRUE(CheckInvalidationInfo(12, "test_payload"));
+  StorePolicy(POLICY_OBJECT_A, 12);
+  EXPECT_TRUE(IsInvalidationAcknowledged(ack));
+  EXPECT_TRUE(CheckInvalidationInfo(0, std::string()));
+}
+
+TEST_F(CloudPolicyInvalidatorTest, HandleInvalidationWithUnknownVersion) {
+  // Register and fire invalidation with unknown version.
+  StorePolicy(POLICY_OBJECT_A);
+  StartInvalidator();
+  syncer::AckHandle ack = FireInvalidation(POLICY_OBJECT_A);
+
+  // Make sure client info is not set until after the invalidation callback is
+  // made.
+  EXPECT_TRUE(CheckInvalidationInfo(0, std::string()));
+  EXPECT_TRUE(CheckInvalidateCalled());
+  EXPECT_TRUE(CheckInvalidationInfo(-1, std::string()));
+
+  // Make sure invalidation is not acknowledged until the store is loaded.
+  EXPECT_FALSE(IsInvalidationAcknowledged(ack));
+  StorePolicy(POLICY_OBJECT_A, -1);
+  EXPECT_TRUE(IsInvalidationAcknowledged(ack));
+  EXPECT_TRUE(CheckInvalidationInfo(0, std::string()));
+}
+
+TEST_F(CloudPolicyInvalidatorTest, HandleMultipleInvalidations) {
+  // Generate multiple invalidations.
+  StorePolicy(POLICY_OBJECT_A);
+  StartInvalidator();
+  syncer::AckHandle ack1 = FireInvalidation(POLICY_OBJECT_A, 1, "test1");
+  EXPECT_TRUE(CheckInvalidationInfo(1, "test1"));
+  syncer::AckHandle ack2 = FireInvalidation(POLICY_OBJECT_A, 2, "test2");
+  EXPECT_TRUE(CheckInvalidationInfo(2, "test2"));
+  syncer::AckHandle ack3= FireInvalidation(POLICY_OBJECT_A, 3, "test3");
+  EXPECT_TRUE(CheckInvalidationInfo(3, "test3"));
+
+  // Make sure the replaced invalidations are acknowledged.
+  EXPECT_TRUE(IsInvalidationAcknowledged(ack1));
+  EXPECT_TRUE(IsInvalidationAcknowledged(ack2));
+
+  // Make sure the invalidate callback is called once.
+  EXPECT_TRUE(CheckInvalidateCalled(false /* unknown_version */));
+
+  // Make sure that the last invalidation is only acknowledged after the store
+  // is loaded with the latest version.
+  StorePolicy(POLICY_OBJECT_A, 1);
+  EXPECT_FALSE(IsInvalidationAcknowledged(ack3));
+  StorePolicy(POLICY_OBJECT_A, 2);
+  EXPECT_FALSE(IsInvalidationAcknowledged(ack3));
+  StorePolicy(POLICY_OBJECT_A, 3);
+  EXPECT_TRUE(IsInvalidationAcknowledged(ack3));
+}
+
+TEST_F(CloudPolicyInvalidatorTest,
+       HandleMultipleInvalidationsWithUnknownVersion) {
+  // Validate that multiple invalidations with unknown version each generate
+  // unique invalidation version numbers.
+  StorePolicy(POLICY_OBJECT_A);
+  StartInvalidator();
+  syncer::AckHandle ack1 = FireInvalidation(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckInvalidationInfo(0, std::string()));
+  EXPECT_TRUE(CheckInvalidateCalled());
+  EXPECT_TRUE(CheckInvalidationInfo(-1, std::string()));
+  syncer::AckHandle ack2 = FireInvalidation(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckInvalidationInfo(0, std::string()));
+  EXPECT_TRUE(CheckInvalidateCalled());
+  EXPECT_TRUE(CheckInvalidationInfo(-2, std::string()));
+  syncer::AckHandle ack3 = FireInvalidation(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckInvalidationInfo(0, std::string()));
+  EXPECT_TRUE(CheckInvalidateCalled());
+  EXPECT_TRUE(CheckInvalidationInfo(-3, std::string()));
+
+  // Make sure the replaced invalidations are acknowledged.
+  EXPECT_TRUE(IsInvalidationAcknowledged(ack1));
+  EXPECT_TRUE(IsInvalidationAcknowledged(ack2));
+
+  // Make sure that the last invalidation is only acknowledged after the store
+  // is loaded with the last unknown version.
+  StorePolicy(POLICY_OBJECT_A, -1);
+  EXPECT_FALSE(IsInvalidationAcknowledged(ack3));
+  StorePolicy(POLICY_OBJECT_A, -2);
+  EXPECT_FALSE(IsInvalidationAcknowledged(ack3));
+  StorePolicy(POLICY_OBJECT_A, -3);
+  EXPECT_TRUE(IsInvalidationAcknowledged(ack3));
+}
+
+TEST_F(CloudPolicyInvalidatorTest, AcknowledgeBeforeInvalidateCallback) {
+  // Generate an invalidation.
+  StorePolicy(POLICY_OBJECT_A);
+  StartInvalidator();
+  syncer::AckHandle ack = FireInvalidation(POLICY_OBJECT_A, 3, "test");
+
+  // Ensure that the invalidate callback is not made and the invalidation is
+  // acknowledged if the store is loaded with the latest version before the
+  // callback is invoked.
+  StorePolicy(POLICY_OBJECT_A, 3);
+  EXPECT_TRUE(IsInvalidationAcknowledged(ack));
+  EXPECT_TRUE(CheckInvalidateNotCalled());
+}
+
+TEST_F(CloudPolicyInvalidatorTest, StateChanged) {
+  // Before registration, changes to the invalidation service state should not
+  // generate change state notifications.
+  StartInvalidator();
+  DisableInvalidationService();
+  EnableInvalidationService();
+  EXPECT_TRUE(CheckStateChangedNotCalled());
+
+  // After registration, changes to the invalidation service state should
+  // generate notifications.
+  StorePolicy(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckStateChangedCalled(true));
+  DisableInvalidationService();
+  EXPECT_TRUE(CheckStateChangedCalled(false));
+  DisableInvalidationService();
+  EXPECT_TRUE(CheckStateChangedNotCalled());
+  EnableInvalidationService();
+  EXPECT_TRUE(CheckStateChangedCalled(true));
+  EnableInvalidationService();
+  EXPECT_TRUE(CheckStateChangedNotCalled());
+
+  // When the invalidation service is enabled, changes to the registration
+  // state should generate notifications.
+  StorePolicy(POLICY_OBJECT_NONE);
+  EXPECT_TRUE(CheckStateChangedCalled(false));
+  StorePolicy(POLICY_OBJECT_NONE);
+  EXPECT_TRUE(CheckStateChangedNotCalled());
+  StorePolicy(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckStateChangedCalled(true));
+  StorePolicy(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckStateChangedNotCalled());
+
+  // When the invalidation service is disabled, changes to the registration
+  // state should not generate notifications.
+  DisableInvalidationService();
+  EXPECT_TRUE(CheckStateChangedCalled(false));
+  StorePolicy(POLICY_OBJECT_NONE);
+  StorePolicy(POLICY_OBJECT_A);
+  EXPECT_TRUE(CheckStateChangedNotCalled());
+}
+
+TEST_F(CloudPolicyInvalidatorTest, RefreshMetricsUnregistered) {
+  // Store loads occurring before invalidation registration are not counted.
+  StartInvalidator();
+  StorePolicy(POLICY_OBJECT_NONE, 0, false /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_NONE, 0, true /* policy_changed */);
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshChanged));
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshChangedNoInvalidations));
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshUnchanged));
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshInvalidatedChanged));
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshInvalidatedUnchanged));
+}
+
+TEST_F(CloudPolicyInvalidatorTest, RefreshMetricsNoInvalidations) {
+  // Store loads occurring while registered should be differentiated depending
+  // on whether the invalidation service was enabled or not.
+  StorePolicy(POLICY_OBJECT_A);
+  StartInvalidator();
+  StorePolicy(POLICY_OBJECT_A, 0, false /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 0, true /* policy_changed */);
+  DisableInvalidationService();
+  StorePolicy(POLICY_OBJECT_A, 0, false /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 0, true /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 0, false /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 0, true /* policy_changed */);
+  EXPECT_EQ(1, GetCount(kMetricPolicyRefreshChanged));
+  EXPECT_EQ(2, GetCount(kMetricPolicyRefreshChangedNoInvalidations));
+  EXPECT_EQ(3, GetCount(kMetricPolicyRefreshUnchanged));
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshInvalidatedChanged));
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshInvalidatedUnchanged));
+}
+
+TEST_F(CloudPolicyInvalidatorTest, RefreshMetricsStoreSameTimestamp) {
+  // Store loads with the same timestamp as the load which causes registration
+  // are not counted.
+  StartInvalidator();
+  StorePolicy(
+      POLICY_OBJECT_A, 0, false /* policy_changed */, 12 /* timestamp */);
+  StorePolicy(
+      POLICY_OBJECT_A, 0, false /* policy_changed */, 12 /* timestamp */);
+  StorePolicy(
+      POLICY_OBJECT_A, 0, true /* policy_changed */, 12 /* timestamp */);
+
+  // The next load with a different timestamp counts.
+  StorePolicy(
+      POLICY_OBJECT_A, 0, true /* policy_changed */, 13 /* timestamp */);
+
+  EXPECT_EQ(1, GetCount(kMetricPolicyRefreshChanged));
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshChangedNoInvalidations));
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshUnchanged));
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshInvalidatedChanged));
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshInvalidatedUnchanged));
+}
+
+TEST_F(CloudPolicyInvalidatorTest, RefreshMetricsInvalidation) {
+  // Store loads after an invalidation are counted as invalidated, even if
+  // the loads do not result in the invalidation being acknowledged.
+  StartInvalidator();
+  StorePolicy(POLICY_OBJECT_A);
+  FireInvalidation(POLICY_OBJECT_A, 5, "test");
+  StorePolicy(POLICY_OBJECT_A, 0, false /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 0, true /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 5, true /* policy_changed */);
+
+  // Store loads after the invalidation is complete are not counted as
+  // invalidated.
+  StorePolicy(POLICY_OBJECT_A, 0, false /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 0, true /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 0, false /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 0, true /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 0, false /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 0, true /* policy_changed */);
+  StorePolicy(POLICY_OBJECT_A, 0, false /* policy_changed */);
+
+  EXPECT_EQ(3, GetCount(kMetricPolicyRefreshChanged));
+  EXPECT_EQ(0, GetCount(kMetricPolicyRefreshChangedNoInvalidations));
+  EXPECT_EQ(4, GetCount(kMetricPolicyRefreshUnchanged));
+  EXPECT_EQ(2, GetCount(kMetricPolicyRefreshInvalidatedChanged));
+  EXPECT_EQ(1, GetCount(kMetricPolicyRefreshInvalidatedUnchanged));
+}
+
+TEST_F(CloudPolicyInvalidatorTest, InvalidationMetrics) {
+  // Generate a mix of versioned and unknown-version invalidations.
+  StorePolicy(POLICY_OBJECT_A);
+  StartInvalidator();
+  FireInvalidation(POLICY_OBJECT_B);
+  FireInvalidation(POLICY_OBJECT_A);
+  FireInvalidation(POLICY_OBJECT_B, 1, "test");
+  FireInvalidation(POLICY_OBJECT_A, 1, "test");
+  FireInvalidation(POLICY_OBJECT_A, 2, "test");
+  FireInvalidation(POLICY_OBJECT_A);
+  FireInvalidation(POLICY_OBJECT_A);
+  FireInvalidation(POLICY_OBJECT_A, 3, "test");
+  FireInvalidation(POLICY_OBJECT_A, 4, "test");
+
+  // Verify that received invalidations metrics are correct.
+  EXPECT_EQ(3, GetCount(kMetricPolicyInvalidationsNoPayload));
+  EXPECT_EQ(4, GetCount(kMetricPolicyInvalidationsPayload));
+}
+
+}  // namespace policy