path: root/components/user_prefs/tracked/pref_hash_filter_unittest.cc

// Copyright 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 "components/user_prefs/tracked/pref_hash_filter.h"

#include <map>
#include <set>
#include <string>
#include <utility>
#include <vector>

#include "base/basictypes.h"
#include "base/bind.h"
#include "base/callback_forward.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/histogram_samples.h"
#include "base/metrics/statistics_recorder.h"
#include "base/prefs/testing_pref_store.h"
#include "base/values.h"
#include "components/user_prefs/tracked/hash_store_contents.h"
#include "components/user_prefs/tracked/mock_validation_delegate.h"
#include "components/user_prefs/tracked/pref_hash_store.h"
#include "components/user_prefs/tracked/pref_hash_store_transaction.h"
#include "components/user_prefs/tracked/pref_names.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace {

const char kAtomicPref[] = "atomic_pref";
const char kAtomicPref2[] = "atomic_pref2";
const char kAtomicPref3[] = "pref3";
const char kAtomicPref4[] = "pref4";
const char kReportOnlyPref[] = "report_only";
const char kReportOnlySplitPref[] = "report_only_split_pref";
const char kSplitPref[] = "split_pref";

const PrefHashFilter::TrackedPreferenceMetadata kTestTrackedPrefs[] = {
    {0,
     kAtomicPref,
     PrefHashFilter::ENFORCE_ON_LOAD,
     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
     PrefHashFilter::VALUE_PERSONAL},
    {1,
     kReportOnlyPref,
     PrefHashFilter::NO_ENFORCEMENT,
     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
     PrefHashFilter::VALUE_IMPERSONAL},
    {2,
     kSplitPref,
     PrefHashFilter::ENFORCE_ON_LOAD,
     PrefHashFilter::TRACKING_STRATEGY_SPLIT,
     PrefHashFilter::VALUE_IMPERSONAL},
    {3,
     kReportOnlySplitPref,
     PrefHashFilter::NO_ENFORCEMENT,
     PrefHashFilter::TRACKING_STRATEGY_SPLIT,
     PrefHashFilter::VALUE_IMPERSONAL},
    {4,
     kAtomicPref2,
     PrefHashFilter::ENFORCE_ON_LOAD,
     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
     PrefHashFilter::VALUE_IMPERSONAL},
    {5,
     kAtomicPref3,
     PrefHashFilter::ENFORCE_ON_LOAD,
     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
     PrefHashFilter::VALUE_IMPERSONAL},
    {6,
     kAtomicPref4,
     PrefHashFilter::ENFORCE_ON_LOAD,
     PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
     PrefHashFilter::VALUE_IMPERSONAL},
};

}  // namespace

// A PrefHashStore that allows simulation of CheckValue results and captures
// checked and stored values.
class MockPrefHashStore : public PrefHashStore {
 public:
  typedef std::pair<const void*, PrefHashFilter::PrefTrackingStrategy>
      ValuePtrStrategyPair;

  MockPrefHashStore()
      : stamp_super_mac_result_(false),
        is_super_mac_valid_result_(false),
        transactions_performed_(0),
        transaction_active_(false) {}

  ~MockPrefHashStore() override { EXPECT_FALSE(transaction_active_); }

  // Set the result that will be returned when |path| is passed to
  // |CheckValue/CheckSplitValue|.
  void SetCheckResult(const std::string& path,
                      PrefHashStoreTransaction::ValueState result);

  // Set the invalid_keys that will be returned when |path| is passed to
  // |CheckSplitValue|. SetCheckResult should already have been called for
  // |path| with |result == CHANGED| for this to make any sense.
  void SetInvalidKeysResult(
      const std::string& path,
      const std::vector<std::string>& invalid_keys_result);

  // Sets the value that will be returned from
  // PrefHashStoreTransaction::StampSuperMAC().
  void set_stamp_super_mac_result(bool result) {
    stamp_super_mac_result_ = result;
  }

  // Sets the value that will be returned from
  // PrefHashStoreTransaction::IsSuperMACValid().
  void set_is_super_mac_valid_result(bool result) {
    is_super_mac_valid_result_ = result;
  }

  // Returns the number of transactions that were performed.
  size_t transactions_performed() { return transactions_performed_; }

  // Returns the number of paths checked.
  size_t checked_paths_count() const { return checked_values_.size(); }

  // Returns the number of paths stored.
  size_t stored_paths_count() const { return stored_values_.size(); }

  // Returns the pointer value and strategy that was passed to
  // |CheckHash/CheckSplitHash| for |path|. The returned pointer could since
  // have been freed and is thus not safe to dereference.
  ValuePtrStrategyPair checked_value(const std::string& path) const {
    std::map<std::string, ValuePtrStrategyPair>::const_iterator value =
        checked_values_.find(path);
    if (value != checked_values_.end())
      return value->second;
    return std::make_pair(
        reinterpret_cast<void*>(0xBAD),
        static_cast<PrefHashFilter::PrefTrackingStrategy>(-1));
  }

  // Returns the pointer value that was passed to |StoreHash/StoreSplitHash| for
  // |path|. The returned pointer could since have been freed and is thus not
  // safe to dereference.
  ValuePtrStrategyPair stored_value(const std::string& path) const {
    std::map<std::string, ValuePtrStrategyPair>::const_iterator value =
        stored_values_.find(path);
    if (value != stored_values_.end())
      return value->second;
    return std::make_pair(
        reinterpret_cast<void*>(0xBAD),
        static_cast<PrefHashFilter::PrefTrackingStrategy>(-1));
  }

  // PrefHashStore implementation.
  scoped_ptr<PrefHashStoreTransaction> BeginTransaction(
      scoped_ptr<HashStoreContents> storage) override;

 private:
  // A MockPrefHashStoreTransaction is handed to the caller on
  // MockPrefHashStore::BeginTransaction(). It then stores state in its
  // underlying MockPrefHashStore about calls it receives from that same caller
  // which can later be verified in tests.
  class MockPrefHashStoreTransaction : public PrefHashStoreTransaction {
   public:
    explicit MockPrefHashStoreTransaction(MockPrefHashStore* outer)
        : outer_(outer) {}

    ~MockPrefHashStoreTransaction() override {
      outer_->transaction_active_ = false;
      ++outer_->transactions_performed_;
    }

    // PrefHashStoreTransaction implementation.
    PrefHashStoreTransaction::ValueState CheckValue(
        const std::string& path,
        const base::Value* value) const override;
    void StoreHash(const std::string& path,
                   const base::Value* new_value) override;
    PrefHashStoreTransaction::ValueState CheckSplitValue(
        const std::string& path,
        const base::DictionaryValue* initial_split_value,
        std::vector<std::string>* invalid_keys) const override;
    void StoreSplitHash(const std::string& path,
                        const base::DictionaryValue* split_value) override;
    bool HasHash(const std::string& path) const override;
    void ImportHash(const std::string& path, const base::Value* hash) override;
    void ClearHash(const std::string& path) override;
    bool IsSuperMACValid() const override;
    bool StampSuperMac() override;

   private:
    MockPrefHashStore* outer_;

    DISALLOW_COPY_AND_ASSIGN(MockPrefHashStoreTransaction);
  };

  // Records a call to this mock's CheckValue/CheckSplitValue methods.
  PrefHashStoreTransaction::ValueState RecordCheckValue(
      const std::string& path,
      const base::Value* value,
      PrefHashFilter::PrefTrackingStrategy strategy);

  // Records a call to this mock's StoreHash/StoreSplitHash methods.
  void RecordStoreHash(const std::string& path,
                       const base::Value* new_value,
                       PrefHashFilter::PrefTrackingStrategy strategy);

  std::map<std::string, PrefHashStoreTransaction::ValueState> check_results_;
  std::map<std::string, std::vector<std::string>> invalid_keys_results_;

  bool stamp_super_mac_result_;
  bool is_super_mac_valid_result_;

  std::map<std::string, ValuePtrStrategyPair> checked_values_;
  std::map<std::string, ValuePtrStrategyPair> stored_values_;

  // Number of transactions that were performed via this MockPrefHashStore.
  size_t transactions_performed_;

  // Whether a transaction is currently active (only one transaction should be
  // active at a time).
  bool transaction_active_;

  DISALLOW_COPY_AND_ASSIGN(MockPrefHashStore);
};

void MockPrefHashStore::SetCheckResult(
    const std::string& path,
    PrefHashStoreTransaction::ValueState result) {
  check_results_.insert(std::make_pair(path, result));
}

void MockPrefHashStore::SetInvalidKeysResult(
    const std::string& path,
    const std::vector<std::string>& invalid_keys_result) {
  // Ensure |check_results_| has a CHANGED entry for |path|.
  std::map<std::string, PrefHashStoreTransaction::ValueState>::const_iterator
      result = check_results_.find(path);
  ASSERT_TRUE(result != check_results_.end());
  ASSERT_EQ(PrefHashStoreTransaction::CHANGED, result->second);

  invalid_keys_results_.insert(std::make_pair(path, invalid_keys_result));
}

scoped_ptr<PrefHashStoreTransaction> MockPrefHashStore::BeginTransaction(
    scoped_ptr<HashStoreContents> storage) {
  EXPECT_FALSE(transaction_active_);
  return scoped_ptr<PrefHashStoreTransaction>(
      new MockPrefHashStoreTransaction(this));
}

PrefHashStoreTransaction::ValueState MockPrefHashStore::RecordCheckValue(
    const std::string& path,
    const base::Value* value,
    PrefHashFilter::PrefTrackingStrategy strategy) {
  // Record that |path| was checked and validate that it wasn't previously
  // checked.
  EXPECT_TRUE(checked_values_.insert(std::make_pair(
                                         path, std::make_pair(value, strategy)))
                  .second);
  std::map<std::string, PrefHashStoreTransaction::ValueState>::const_iterator
      result = check_results_.find(path);
  if (result != check_results_.end())
    return result->second;
  return PrefHashStoreTransaction::UNCHANGED;
}

void MockPrefHashStore::RecordStoreHash(
    const std::string& path,
    const base::Value* new_value,
    PrefHashFilter::PrefTrackingStrategy strategy) {
  EXPECT_TRUE(
      stored_values_.insert(std::make_pair(path,
                                           std::make_pair(new_value, strategy)))
          .second);
}

PrefHashStoreTransaction::ValueState
MockPrefHashStore::MockPrefHashStoreTransaction::CheckValue(
    const std::string& path,
    const base::Value* value) const {
  return outer_->RecordCheckValue(path, value,
                                  PrefHashFilter::TRACKING_STRATEGY_ATOMIC);
}

void MockPrefHashStore::MockPrefHashStoreTransaction::StoreHash(
    const std::string& path,
    const base::Value* new_value) {
  outer_->RecordStoreHash(path, new_value,
                          PrefHashFilter::TRACKING_STRATEGY_ATOMIC);
}

PrefHashStoreTransaction::ValueState
MockPrefHashStore::MockPrefHashStoreTransaction::CheckSplitValue(
    const std::string& path,
    const base::DictionaryValue* initial_split_value,
    std::vector<std::string>* invalid_keys) const {
  EXPECT_TRUE(invalid_keys && invalid_keys->empty());

  std::map<std::string, std::vector<std::string>>::const_iterator
      invalid_keys_result = outer_->invalid_keys_results_.find(path);
  if (invalid_keys_result != outer_->invalid_keys_results_.end()) {
    invalid_keys->insert(invalid_keys->begin(),
                         invalid_keys_result->second.begin(),
                         invalid_keys_result->second.end());
  }

  return outer_->RecordCheckValue(path, initial_split_value,
                                  PrefHashFilter::TRACKING_STRATEGY_SPLIT);
}

void MockPrefHashStore::MockPrefHashStoreTransaction::StoreSplitHash(
    const std::string& path,
    const base::DictionaryValue* new_value) {
  outer_->RecordStoreHash(path, new_value,
                          PrefHashFilter::TRACKING_STRATEGY_SPLIT);
}

bool MockPrefHashStore::MockPrefHashStoreTransaction::HasHash(
    const std::string& path) const {
  ADD_FAILURE() << "Unexpected call.";
  return false;
}

void MockPrefHashStore::MockPrefHashStoreTransaction::ImportHash(
    const std::string& path,
    const base::Value* hash) {
  ADD_FAILURE() << "Unexpected call.";
}

void MockPrefHashStore::MockPrefHashStoreTransaction::ClearHash(
    const std::string& path) {
  // Allow this to be called by PrefHashFilter's deprecated tracked prefs
  // cleanup tasks.
}

bool MockPrefHashStore::MockPrefHashStoreTransaction::IsSuperMACValid() const {
  return outer_->is_super_mac_valid_result_;
}

bool MockPrefHashStore::MockPrefHashStoreTransaction::StampSuperMac() {
  return outer_->stamp_super_mac_result_;
}

std::vector<PrefHashFilter::TrackedPreferenceMetadata> GetConfiguration(
    PrefHashFilter::EnforcementLevel max_enforcement_level) {
  std::vector<PrefHashFilter::TrackedPreferenceMetadata> configuration(
      kTestTrackedPrefs, kTestTrackedPrefs + arraysize(kTestTrackedPrefs));
  for (std::vector<PrefHashFilter::TrackedPreferenceMetadata>::iterator it =
           configuration.begin();
       it != configuration.end(); ++it) {
    if (it->enforcement_level > max_enforcement_level)
      it->enforcement_level = max_enforcement_level;
  }
  return configuration;
}

class PrefHashFilterTest
    : public testing::TestWithParam<PrefHashFilter::EnforcementLevel> {
 public:
  PrefHashFilterTest()
      : mock_pref_hash_store_(NULL),
        pref_store_contents_(new base::DictionaryValue),
        reset_recorded_(false) {}

  void SetUp() override {
    base::StatisticsRecorder::Initialize();
    Reset();
  }

 protected:
  // Reset the PrefHashFilter instance.
  void Reset() {
    // Construct a PrefHashFilter and MockPrefHashStore for the test.
    InitializePrefHashFilter(GetConfiguration(GetParam()));
  }

  // Initializes |pref_hash_filter_| with a PrefHashFilter that uses a
  // MockPrefHashStore. The raw pointer to the MockPrefHashStore (owned by the
  // PrefHashFilter) is stored in |mock_pref_hash_store_|.
  void InitializePrefHashFilter(const std::vector<
      PrefHashFilter::TrackedPreferenceMetadata>& configuration) {
    scoped_ptr<MockPrefHashStore> temp_mock_pref_hash_store(
        new MockPrefHashStore);
    mock_pref_hash_store_ = temp_mock_pref_hash_store.get();
    pref_hash_filter_.reset(new PrefHashFilter(
        temp_mock_pref_hash_store.Pass(), configuration,
        base::Bind(&PrefHashFilterTest::RecordReset, base::Unretained(this)),
        &mock_validation_delegate_, arraysize(kTestTrackedPrefs), true));
  }

  // Verifies whether a reset was reported by the PrefHashFiler. Also verifies
  // that kPreferenceResetTime was set (or not) accordingly.
  void VerifyRecordedReset(bool reset_expected) {
    EXPECT_EQ(reset_expected, reset_recorded_);
    EXPECT_EQ(reset_expected,
              pref_store_contents_->Get(
                  user_prefs::kPreferenceResetTime, NULL));
  }

  // Calls FilterOnLoad() on |pref_hash_Filter_|. |pref_store_contents_| is
  // handed off, but should be given back to us synchronously through
  // GetPrefsBack() as there is no FilterOnLoadInterceptor installed on
  // |pref_hash_filter_|.
  void DoFilterOnLoad(bool expect_prefs_modifications) {
    pref_hash_filter_->FilterOnLoad(
        base::Bind(&PrefHashFilterTest::GetPrefsBack, base::Unretained(this),
                   expect_prefs_modifications),
        pref_store_contents_.Pass());
  }

  MockPrefHashStore* mock_pref_hash_store_;
  scoped_ptr<base::DictionaryValue> pref_store_contents_;
  MockValidationDelegate mock_validation_delegate_;
  scoped_ptr<PrefHashFilter> pref_hash_filter_;

 private:
  // Stores |prefs| back in |pref_store_contents| and ensure
  // |expected_schedule_write| matches the reported |schedule_write|.
  void GetPrefsBack(bool expected_schedule_write,
                    scoped_ptr<base::DictionaryValue> prefs,
                    bool schedule_write) {
    pref_store_contents_ = prefs.Pass();
    EXPECT_TRUE(pref_store_contents_);
    EXPECT_EQ(expected_schedule_write, schedule_write);
  }

  void RecordReset() {
    // As-is |reset_recorded_| is only designed to remember a single reset, make
    // sure none was previously recorded.
    EXPECT_FALSE(reset_recorded_);
    reset_recorded_ = true;
  }

  bool reset_recorded_;

  DISALLOW_COPY_AND_ASSIGN(PrefHashFilterTest);
};

TEST_P(PrefHashFilterTest, EmptyAndUnchanged) {
  DoFilterOnLoad(false);
  // All paths checked.
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_pref_hash_store_->checked_paths_count());
  // No paths stored, since they all return |UNCHANGED|.
  ASSERT_EQ(0u, mock_pref_hash_store_->stored_paths_count());
  // Since there was nothing in |pref_store_contents_| the checked value should
  // have been NULL for all tracked preferences.
  for (size_t i = 0; i < arraysize(kTestTrackedPrefs); ++i) {
    ASSERT_EQ(
        NULL,
        mock_pref_hash_store_->checked_value(kTestTrackedPrefs[i].name).first);
  }
  ASSERT_EQ(1u, mock_pref_hash_store_->transactions_performed());
  VerifyRecordedReset(false);

  // Delegate saw all paths, and all unchanged.
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_validation_delegate_.recorded_validations_count());
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_validation_delegate_.CountValidationsOfState(
                PrefHashStoreTransaction::UNCHANGED));
}

TEST_P(PrefHashFilterTest, StampSuperMACAltersStore) {
  mock_pref_hash_store_->set_stamp_super_mac_result(true);
  DoFilterOnLoad(true);
  // No paths stored, since they all return |UNCHANGED|. The StampSuperMAC
  // result is the only reason the prefs were considered altered.
  ASSERT_EQ(0u, mock_pref_hash_store_->stored_paths_count());
}

TEST_P(PrefHashFilterTest, FilterTrackedPrefUpdate) {
  base::DictionaryValue root_dict;
  // Ownership of |string_value| is transfered to |root_dict|.
  base::Value* string_value = new base::StringValue("string value");
  root_dict.Set(kAtomicPref, string_value);

  // No path should be stored on FilterUpdate.
  pref_hash_filter_->FilterUpdate(kAtomicPref);
  ASSERT_EQ(0u, mock_pref_hash_store_->stored_paths_count());

  // One path should be stored on FilterSerializeData.
  pref_hash_filter_->FilterSerializeData(&root_dict);
  ASSERT_EQ(1u, mock_pref_hash_store_->stored_paths_count());
  MockPrefHashStore::ValuePtrStrategyPair stored_value =
      mock_pref_hash_store_->stored_value(kAtomicPref);
  ASSERT_EQ(string_value, stored_value.first);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_ATOMIC, stored_value.second);

  ASSERT_EQ(1u, mock_pref_hash_store_->transactions_performed());
  VerifyRecordedReset(false);
}

TEST_P(PrefHashFilterTest, ReportSuperMacValidity) {
  // Do this once just to force the histogram to be defined.
  DoFilterOnLoad(false);

  base::HistogramBase* histogram = base::StatisticsRecorder::FindHistogram(
      "Settings.HashesDictionaryTrusted");
  ASSERT_TRUE(histogram);

  base::HistogramBase::Count initial_untrusted =
      histogram->SnapshotSamples()->GetCount(0);
  base::HistogramBase::Count initial_trusted =
      histogram->SnapshotSamples()->GetCount(1);

  Reset();

  // Run with an invalid super MAC.
  mock_pref_hash_store_->set_is_super_mac_valid_result(false);

  DoFilterOnLoad(false);

  // Verify that the invalidity was reported.
  ASSERT_EQ(initial_untrusted + 1, histogram->SnapshotSamples()->GetCount(0));
  ASSERT_EQ(initial_trusted, histogram->SnapshotSamples()->GetCount(1));

  Reset();

  // Run with a valid super MAC.
  mock_pref_hash_store_->set_is_super_mac_valid_result(true);

  DoFilterOnLoad(false);

  // Verify that the validity was reported.
  ASSERT_EQ(initial_untrusted + 1, histogram->SnapshotSamples()->GetCount(0));
  ASSERT_EQ(initial_trusted + 1, histogram->SnapshotSamples()->GetCount(1));
}

TEST_P(PrefHashFilterTest, FilterSplitPrefUpdate) {
  base::DictionaryValue root_dict;
  // Ownership of |dict_value| is transfered to |root_dict|.
  base::DictionaryValue* dict_value = new base::DictionaryValue;
  dict_value->SetString("a", "foo");
  dict_value->SetInteger("b", 1234);
  root_dict.Set(kSplitPref, dict_value);

  // No path should be stored on FilterUpdate.
  pref_hash_filter_->FilterUpdate(kSplitPref);
  ASSERT_EQ(0u, mock_pref_hash_store_->stored_paths_count());

  // One path should be stored on FilterSerializeData.
  pref_hash_filter_->FilterSerializeData(&root_dict);
  ASSERT_EQ(1u, mock_pref_hash_store_->stored_paths_count());
  MockPrefHashStore::ValuePtrStrategyPair stored_value =
      mock_pref_hash_store_->stored_value(kSplitPref);
  ASSERT_EQ(dict_value, stored_value.first);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_SPLIT, stored_value.second);

  ASSERT_EQ(1u, mock_pref_hash_store_->transactions_performed());
  VerifyRecordedReset(false);
}

TEST_P(PrefHashFilterTest, FilterUntrackedPrefUpdate) {
  base::DictionaryValue root_dict;
  root_dict.Set("untracked", new base::StringValue("some value"));
  pref_hash_filter_->FilterUpdate("untracked");

  // No paths should be stored on FilterUpdate.
  ASSERT_EQ(0u, mock_pref_hash_store_->stored_paths_count());

  // Nor on FilterSerializeData.
  pref_hash_filter_->FilterSerializeData(&root_dict);
  ASSERT_EQ(0u, mock_pref_hash_store_->stored_paths_count());

  // No transaction should even be started on FilterSerializeData() if there are
  // no updates to perform.
  ASSERT_EQ(0u, mock_pref_hash_store_->transactions_performed());
}

TEST_P(PrefHashFilterTest, MultiplePrefsFilterSerializeData) {
  base::DictionaryValue root_dict;
  // Ownership of the following values is transfered to |root_dict|.
  base::Value* int_value1 = new base::FundamentalValue(1);
  base::Value* int_value2 = new base::FundamentalValue(2);
  base::Value* int_value3 = new base::FundamentalValue(3);
  base::Value* int_value4 = new base::FundamentalValue(4);
  base::DictionaryValue* dict_value = new base::DictionaryValue;
  dict_value->Set("a", new base::FundamentalValue(true));
  root_dict.Set(kAtomicPref, int_value1);
  root_dict.Set(kAtomicPref2, int_value2);
  root_dict.Set(kAtomicPref3, int_value3);
  root_dict.Set("untracked", int_value4);
  root_dict.Set(kSplitPref, dict_value);

  // Only update kAtomicPref, kAtomicPref3, and kSplitPref.
  pref_hash_filter_->FilterUpdate(kAtomicPref);
  pref_hash_filter_->FilterUpdate(kAtomicPref3);
  pref_hash_filter_->FilterUpdate(kSplitPref);
  ASSERT_EQ(0u, mock_pref_hash_store_->stored_paths_count());

  // Update kAtomicPref3 again, nothing should be stored still.
  base::Value* int_value5 = new base::FundamentalValue(5);
  root_dict.Set(kAtomicPref3, int_value5);
  ASSERT_EQ(0u, mock_pref_hash_store_->stored_paths_count());

  // On FilterSerializeData, only kAtomicPref, kAtomicPref3, and kSplitPref
  // should get a new hash.
  pref_hash_filter_->FilterSerializeData(&root_dict);
  ASSERT_EQ(3u, mock_pref_hash_store_->stored_paths_count());
  MockPrefHashStore::ValuePtrStrategyPair stored_value_atomic1 =
      mock_pref_hash_store_->stored_value(kAtomicPref);
  ASSERT_EQ(int_value1, stored_value_atomic1.first);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
            stored_value_atomic1.second);
  ASSERT_EQ(1u, mock_pref_hash_store_->transactions_performed());

  MockPrefHashStore::ValuePtrStrategyPair stored_value_atomic3 =
      mock_pref_hash_store_->stored_value(kAtomicPref3);
  ASSERT_EQ(int_value5, stored_value_atomic3.first);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
            stored_value_atomic3.second);

  MockPrefHashStore::ValuePtrStrategyPair stored_value_split =
      mock_pref_hash_store_->stored_value(kSplitPref);
  ASSERT_EQ(dict_value, stored_value_split.first);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_SPLIT, stored_value_split.second);
}

TEST_P(PrefHashFilterTest, UnknownNullValue) {
  ASSERT_FALSE(pref_store_contents_->Get(kAtomicPref, NULL));
  ASSERT_FALSE(pref_store_contents_->Get(kSplitPref, NULL));
  // NULL values are always trusted by the PrefHashStore.
  mock_pref_hash_store_->SetCheckResult(
      kAtomicPref, PrefHashStoreTransaction::TRUSTED_NULL_VALUE);
  mock_pref_hash_store_->SetCheckResult(
      kSplitPref, PrefHashStoreTransaction::TRUSTED_NULL_VALUE);
  DoFilterOnLoad(false);
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_pref_hash_store_->checked_paths_count());
  ASSERT_EQ(2u, mock_pref_hash_store_->stored_paths_count());
  ASSERT_EQ(1u, mock_pref_hash_store_->transactions_performed());

  MockPrefHashStore::ValuePtrStrategyPair stored_atomic_value =
      mock_pref_hash_store_->stored_value(kAtomicPref);
  ASSERT_EQ(NULL, stored_atomic_value.first);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
            stored_atomic_value.second);

  MockPrefHashStore::ValuePtrStrategyPair stored_split_value =
      mock_pref_hash_store_->stored_value(kSplitPref);
  ASSERT_EQ(NULL, stored_split_value.first);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_SPLIT, stored_split_value.second);

  // Delegate saw all prefs, two of which had the expected value_state.
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_validation_delegate_.recorded_validations_count());
  ASSERT_EQ(2u, mock_validation_delegate_.CountValidationsOfState(
                    PrefHashStoreTransaction::TRUSTED_NULL_VALUE));
  ASSERT_EQ(arraysize(kTestTrackedPrefs) - 2u,
            mock_validation_delegate_.CountValidationsOfState(
                PrefHashStoreTransaction::UNCHANGED));

  const MockValidationDelegate::ValidationEvent* validated_split_pref =
      mock_validation_delegate_.GetEventForPath(kSplitPref);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_SPLIT,
            validated_split_pref->strategy);
  ASSERT_FALSE(validated_split_pref->is_personal);
  const MockValidationDelegate::ValidationEvent* validated_atomic_pref =
      mock_validation_delegate_.GetEventForPath(kAtomicPref);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
            validated_atomic_pref->strategy);
  ASSERT_TRUE(validated_atomic_pref->is_personal);
}

TEST_P(PrefHashFilterTest, InitialValueUnknown) {
  // Ownership of these values is transfered to |pref_store_contents_|.
  base::StringValue* string_value = new base::StringValue("string value");
  pref_store_contents_->Set(kAtomicPref, string_value);

  base::DictionaryValue* dict_value = new base::DictionaryValue;
  dict_value->SetString("a", "foo");
  dict_value->SetInteger("b", 1234);
  pref_store_contents_->Set(kSplitPref, dict_value);

  ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref, NULL));
  ASSERT_TRUE(pref_store_contents_->Get(kSplitPref, NULL));

  mock_pref_hash_store_->SetCheckResult(
      kAtomicPref, PrefHashStoreTransaction::UNTRUSTED_UNKNOWN_VALUE);
  mock_pref_hash_store_->SetCheckResult(
      kSplitPref, PrefHashStoreTransaction::UNTRUSTED_UNKNOWN_VALUE);
  // If we are enforcing, expect this to report changes.
  DoFilterOnLoad(GetParam() >= PrefHashFilter::ENFORCE_ON_LOAD);
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_pref_hash_store_->checked_paths_count());
  ASSERT_EQ(2u, mock_pref_hash_store_->stored_paths_count());
  ASSERT_EQ(1u, mock_pref_hash_store_->transactions_performed());

  // Delegate saw all prefs, two of which had the expected value_state.
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_validation_delegate_.recorded_validations_count());
  ASSERT_EQ(2u, mock_validation_delegate_.CountValidationsOfState(
                    PrefHashStoreTransaction::UNTRUSTED_UNKNOWN_VALUE));
  ASSERT_EQ(arraysize(kTestTrackedPrefs) - 2u,
            mock_validation_delegate_.CountValidationsOfState(
                PrefHashStoreTransaction::UNCHANGED));

  MockPrefHashStore::ValuePtrStrategyPair stored_atomic_value =
      mock_pref_hash_store_->stored_value(kAtomicPref);
  MockPrefHashStore::ValuePtrStrategyPair stored_split_value =
      mock_pref_hash_store_->stored_value(kSplitPref);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
            stored_atomic_value.second);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_SPLIT, stored_split_value.second);
  if (GetParam() == PrefHashFilter::ENFORCE_ON_LOAD) {
    // Ensure the prefs were cleared and the hashes for NULL were restored if
    // the current enforcement level denies seeding.
    ASSERT_FALSE(pref_store_contents_->Get(kAtomicPref, NULL));
    ASSERT_EQ(NULL, stored_atomic_value.first);

    ASSERT_FALSE(pref_store_contents_->Get(kSplitPref, NULL));
    ASSERT_EQ(NULL, stored_split_value.first);

    VerifyRecordedReset(true);
  } else {
    // Otherwise the values should have remained intact and the hashes should
    // have been updated to match them.
    const base::Value* atomic_value_in_store;
    ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref, &atomic_value_in_store));
    ASSERT_EQ(string_value, atomic_value_in_store);
    ASSERT_EQ(string_value, stored_atomic_value.first);

    const base::Value* split_value_in_store;
    ASSERT_TRUE(pref_store_contents_->Get(kSplitPref, &split_value_in_store));
    ASSERT_EQ(dict_value, split_value_in_store);
    ASSERT_EQ(dict_value, stored_split_value.first);

    VerifyRecordedReset(false);
  }
}

TEST_P(PrefHashFilterTest, InitialValueTrustedUnknown) {
  // Ownership of this value is transfered to |pref_store_contents_|.
  base::Value* string_value = new base::StringValue("test");
  pref_store_contents_->Set(kAtomicPref, string_value);

  base::DictionaryValue* dict_value = new base::DictionaryValue;
  dict_value->SetString("a", "foo");
  dict_value->SetInteger("b", 1234);
  pref_store_contents_->Set(kSplitPref, dict_value);

  ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref, NULL));
  ASSERT_TRUE(pref_store_contents_->Get(kSplitPref, NULL));

  mock_pref_hash_store_->SetCheckResult(
      kAtomicPref, PrefHashStoreTransaction::TRUSTED_UNKNOWN_VALUE);
  mock_pref_hash_store_->SetCheckResult(
      kSplitPref, PrefHashStoreTransaction::TRUSTED_UNKNOWN_VALUE);
  DoFilterOnLoad(false);
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_pref_hash_store_->checked_paths_count());
  ASSERT_EQ(2u, mock_pref_hash_store_->stored_paths_count());
  ASSERT_EQ(1u, mock_pref_hash_store_->transactions_performed());

  // Delegate saw all prefs, two of which had the expected value_state.
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_validation_delegate_.recorded_validations_count());
  ASSERT_EQ(2u, mock_validation_delegate_.CountValidationsOfState(
                    PrefHashStoreTransaction::TRUSTED_UNKNOWN_VALUE));
  ASSERT_EQ(arraysize(kTestTrackedPrefs) - 2u,
            mock_validation_delegate_.CountValidationsOfState(
                PrefHashStoreTransaction::UNCHANGED));

  // Seeding is always allowed for trusted unknown values.
  const base::Value* atomic_value_in_store;
  ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref, &atomic_value_in_store));
  ASSERT_EQ(string_value, atomic_value_in_store);
  MockPrefHashStore::ValuePtrStrategyPair stored_atomic_value =
      mock_pref_hash_store_->stored_value(kAtomicPref);
  ASSERT_EQ(string_value, stored_atomic_value.first);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
            stored_atomic_value.second);

  const base::Value* split_value_in_store;
  ASSERT_TRUE(pref_store_contents_->Get(kSplitPref, &split_value_in_store));
  ASSERT_EQ(dict_value, split_value_in_store);
  MockPrefHashStore::ValuePtrStrategyPair stored_split_value =
      mock_pref_hash_store_->stored_value(kSplitPref);
  ASSERT_EQ(dict_value, stored_split_value.first);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_SPLIT, stored_split_value.second);
}

TEST_P(PrefHashFilterTest, InitialValueChanged) {
  // Ownership of this value is transfered to |pref_store_contents_|.
  base::Value* int_value = new base::FundamentalValue(1234);
  pref_store_contents_->Set(kAtomicPref, int_value);

  base::DictionaryValue* dict_value = new base::DictionaryValue;
  dict_value->SetString("a", "foo");
  dict_value->SetInteger("b", 1234);
  dict_value->SetInteger("c", 56);
  dict_value->SetBoolean("d", false);
  pref_store_contents_->Set(kSplitPref, dict_value);

  ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref, NULL));
  ASSERT_TRUE(pref_store_contents_->Get(kSplitPref, NULL));

  mock_pref_hash_store_->SetCheckResult(kAtomicPref,
                                        PrefHashStoreTransaction::CHANGED);
  mock_pref_hash_store_->SetCheckResult(kSplitPref,
                                        PrefHashStoreTransaction::CHANGED);

  std::vector<std::string> mock_invalid_keys;
  mock_invalid_keys.push_back("a");
  mock_invalid_keys.push_back("c");
  mock_pref_hash_store_->SetInvalidKeysResult(kSplitPref, mock_invalid_keys);

  DoFilterOnLoad(GetParam() >= PrefHashFilter::ENFORCE_ON_LOAD);
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_pref_hash_store_->checked_paths_count());
  ASSERT_EQ(2u, mock_pref_hash_store_->stored_paths_count());
  ASSERT_EQ(1u, mock_pref_hash_store_->transactions_performed());

  MockPrefHashStore::ValuePtrStrategyPair stored_atomic_value =
      mock_pref_hash_store_->stored_value(kAtomicPref);
  MockPrefHashStore::ValuePtrStrategyPair stored_split_value =
      mock_pref_hash_store_->stored_value(kSplitPref);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
            stored_atomic_value.second);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_SPLIT, stored_split_value.second);
  if (GetParam() == PrefHashFilter::ENFORCE_ON_LOAD) {
    // Ensure the atomic pref was cleared and the hash for NULL was restored if
    // the current enforcement level prevents changes.
    ASSERT_FALSE(pref_store_contents_->Get(kAtomicPref, NULL));
    ASSERT_EQ(NULL, stored_atomic_value.first);

    // The split pref on the other hand should only have been stripped of its
    // invalid keys.
    const base::Value* split_value_in_store;
    ASSERT_TRUE(pref_store_contents_->Get(kSplitPref, &split_value_in_store));
    ASSERT_EQ(2U, dict_value->size());
    ASSERT_FALSE(dict_value->HasKey("a"));
    ASSERT_TRUE(dict_value->HasKey("b"));
    ASSERT_FALSE(dict_value->HasKey("c"));
    ASSERT_TRUE(dict_value->HasKey("d"));
    ASSERT_EQ(dict_value, stored_split_value.first);

    VerifyRecordedReset(true);
  } else {
    // Otherwise the value should have remained intact and the hash should have
    // been updated to match it.
    const base::Value* atomic_value_in_store;
    ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref, &atomic_value_in_store));
    ASSERT_EQ(int_value, atomic_value_in_store);
    ASSERT_EQ(int_value, stored_atomic_value.first);

    const base::Value* split_value_in_store;
    ASSERT_TRUE(pref_store_contents_->Get(kSplitPref, &split_value_in_store));
    ASSERT_EQ(dict_value, split_value_in_store);
    ASSERT_EQ(4U, dict_value->size());
    ASSERT_TRUE(dict_value->HasKey("a"));
    ASSERT_TRUE(dict_value->HasKey("b"));
    ASSERT_TRUE(dict_value->HasKey("c"));
    ASSERT_TRUE(dict_value->HasKey("d"));
    ASSERT_EQ(dict_value, stored_split_value.first);

    VerifyRecordedReset(false);
  }
}

TEST_P(PrefHashFilterTest, EmptyCleared) {
  ASSERT_FALSE(pref_store_contents_->Get(kAtomicPref, NULL));
  ASSERT_FALSE(pref_store_contents_->Get(kSplitPref, NULL));
  mock_pref_hash_store_->SetCheckResult(kAtomicPref,
                                        PrefHashStoreTransaction::CLEARED);
  mock_pref_hash_store_->SetCheckResult(kSplitPref,
                                        PrefHashStoreTransaction::CLEARED);
  DoFilterOnLoad(false);
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_pref_hash_store_->checked_paths_count());
  ASSERT_EQ(2u, mock_pref_hash_store_->stored_paths_count());
  ASSERT_EQ(1u, mock_pref_hash_store_->transactions_performed());

  // Delegate saw all prefs, two of which had the expected value_state.
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_validation_delegate_.recorded_validations_count());
  ASSERT_EQ(2u, mock_validation_delegate_.CountValidationsOfState(
                    PrefHashStoreTransaction::CLEARED));
  ASSERT_EQ(arraysize(kTestTrackedPrefs) - 2u,
            mock_validation_delegate_.CountValidationsOfState(
                PrefHashStoreTransaction::UNCHANGED));

  // Regardless of the enforcement level, the only thing that should be done is
  // to restore the hash for NULL. The value itself should still be NULL.
  ASSERT_FALSE(pref_store_contents_->Get(kAtomicPref, NULL));
  MockPrefHashStore::ValuePtrStrategyPair stored_atomic_value =
      mock_pref_hash_store_->stored_value(kAtomicPref);
  ASSERT_EQ(NULL, stored_atomic_value.first);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
            stored_atomic_value.second);

  ASSERT_FALSE(pref_store_contents_->Get(kSplitPref, NULL));
  MockPrefHashStore::ValuePtrStrategyPair stored_split_value =
      mock_pref_hash_store_->stored_value(kSplitPref);
  ASSERT_EQ(NULL, stored_split_value.first);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_SPLIT, stored_split_value.second);
}

TEST_P(PrefHashFilterTest, InitialValueUnchangedLegacyId) {
  // Ownership of these values is transfered to |pref_store_contents_|.
  base::StringValue* string_value = new base::StringValue("string value");
  pref_store_contents_->Set(kAtomicPref, string_value);

  base::DictionaryValue* dict_value = new base::DictionaryValue;
  dict_value->SetString("a", "foo");
  dict_value->SetInteger("b", 1234);
  pref_store_contents_->Set(kSplitPref, dict_value);

  ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref, NULL));
  ASSERT_TRUE(pref_store_contents_->Get(kSplitPref, NULL));

  mock_pref_hash_store_->SetCheckResult(
      kAtomicPref, PrefHashStoreTransaction::SECURE_LEGACY);
  mock_pref_hash_store_->SetCheckResult(
      kSplitPref, PrefHashStoreTransaction::SECURE_LEGACY);
  DoFilterOnLoad(false);
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_pref_hash_store_->checked_paths_count());
  ASSERT_EQ(1u, mock_pref_hash_store_->transactions_performed());

  // Delegate saw all prefs, two of which had the expected value_state.
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_validation_delegate_.recorded_validations_count());
  ASSERT_EQ(2u, mock_validation_delegate_.CountValidationsOfState(
                    PrefHashStoreTransaction::SECURE_LEGACY));
  ASSERT_EQ(arraysize(kTestTrackedPrefs) - 2u,
            mock_validation_delegate_.CountValidationsOfState(
                PrefHashStoreTransaction::UNCHANGED));

  // Ensure that both the atomic and split hashes were restored.
  ASSERT_EQ(2u, mock_pref_hash_store_->stored_paths_count());

  // In all cases, the values should have remained intact and the hashes should
  // have been updated to match them.

  MockPrefHashStore::ValuePtrStrategyPair stored_atomic_value =
      mock_pref_hash_store_->stored_value(kAtomicPref);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_ATOMIC,
            stored_atomic_value.second);
  const base::Value* atomic_value_in_store;
  ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref, &atomic_value_in_store));
  ASSERT_EQ(string_value, atomic_value_in_store);
  ASSERT_EQ(string_value, stored_atomic_value.first);

  MockPrefHashStore::ValuePtrStrategyPair stored_split_value =
      mock_pref_hash_store_->stored_value(kSplitPref);
  ASSERT_EQ(PrefHashFilter::TRACKING_STRATEGY_SPLIT, stored_split_value.second);
  const base::Value* split_value_in_store;
  ASSERT_TRUE(pref_store_contents_->Get(kSplitPref, &split_value_in_store));
  ASSERT_EQ(dict_value, split_value_in_store);
  ASSERT_EQ(dict_value, stored_split_value.first);

  VerifyRecordedReset(false);
}

TEST_P(PrefHashFilterTest, DontResetReportOnly) {
  // Ownership of these values is transfered to |pref_store_contents_|.
  base::Value* int_value1 = new base::FundamentalValue(1);
  base::Value* int_value2 = new base::FundamentalValue(2);
  base::Value* report_only_val = new base::FundamentalValue(3);
  base::DictionaryValue* report_only_split_val = new base::DictionaryValue;
  report_only_split_val->SetInteger("a", 1234);
  pref_store_contents_->Set(kAtomicPref, int_value1);
  pref_store_contents_->Set(kAtomicPref2, int_value2);
  pref_store_contents_->Set(kReportOnlyPref, report_only_val);
  pref_store_contents_->Set(kReportOnlySplitPref, report_only_split_val);

  ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref, NULL));
  ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref2, NULL));
  ASSERT_TRUE(pref_store_contents_->Get(kReportOnlyPref, NULL));
  ASSERT_TRUE(pref_store_contents_->Get(kReportOnlySplitPref, NULL));

  mock_pref_hash_store_->SetCheckResult(kAtomicPref,
                                        PrefHashStoreTransaction::CHANGED);
  mock_pref_hash_store_->SetCheckResult(kAtomicPref2,
                                        PrefHashStoreTransaction::CHANGED);
  mock_pref_hash_store_->SetCheckResult(kReportOnlyPref,
                                        PrefHashStoreTransaction::CHANGED);
  mock_pref_hash_store_->SetCheckResult(kReportOnlySplitPref,
                                        PrefHashStoreTransaction::CHANGED);

  DoFilterOnLoad(GetParam() >= PrefHashFilter::ENFORCE_ON_LOAD);
  // All prefs should be checked and a new hash should be stored for each tested
  // pref.
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_pref_hash_store_->checked_paths_count());
  ASSERT_EQ(4u, mock_pref_hash_store_->stored_paths_count());
  ASSERT_EQ(1u, mock_pref_hash_store_->transactions_performed());

  // Delegate saw all prefs, four of which had the expected value_state.
  ASSERT_EQ(arraysize(kTestTrackedPrefs),
            mock_validation_delegate_.recorded_validations_count());
  ASSERT_EQ(4u, mock_validation_delegate_.CountValidationsOfState(
                    PrefHashStoreTransaction::CHANGED));
  ASSERT_EQ(arraysize(kTestTrackedPrefs) - 4u,
            mock_validation_delegate_.CountValidationsOfState(
                PrefHashStoreTransaction::UNCHANGED));

  // No matter what the enforcement level is, the report only pref should never
  // be reset.
  ASSERT_TRUE(pref_store_contents_->Get(kReportOnlyPref, NULL));
  ASSERT_TRUE(pref_store_contents_->Get(kReportOnlySplitPref, NULL));
  ASSERT_EQ(report_only_val,
            mock_pref_hash_store_->stored_value(kReportOnlyPref).first);
  ASSERT_EQ(report_only_split_val,
            mock_pref_hash_store_->stored_value(kReportOnlySplitPref).first);

  // All other prefs should have been reset if the enforcement level allows it.
  if (GetParam() == PrefHashFilter::ENFORCE_ON_LOAD) {
    ASSERT_FALSE(pref_store_contents_->Get(kAtomicPref, NULL));
    ASSERT_FALSE(pref_store_contents_->Get(kAtomicPref2, NULL));
    ASSERT_EQ(NULL, mock_pref_hash_store_->stored_value(kAtomicPref).first);
    ASSERT_EQ(NULL, mock_pref_hash_store_->stored_value(kAtomicPref2).first);

    VerifyRecordedReset(true);
  } else {
    const base::Value* value_in_store;
    const base::Value* value_in_store2;
    ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref, &value_in_store));
    ASSERT_TRUE(pref_store_contents_->Get(kAtomicPref2, &value_in_store2));
    ASSERT_EQ(int_value1, value_in_store);
    ASSERT_EQ(int_value1,
              mock_pref_hash_store_->stored_value(kAtomicPref).first);
    ASSERT_EQ(int_value2, value_in_store2);
    ASSERT_EQ(int_value2,
              mock_pref_hash_store_->stored_value(kAtomicPref2).first);

    VerifyRecordedReset(false);
  }
}

INSTANTIATE_TEST_CASE_P(PrefHashFilterTestInstance,
                        PrefHashFilterTest,
                        testing::Values(PrefHashFilter::NO_ENFORCEMENT,
                                        PrefHashFilter::ENFORCE_ON_LOAD));