blob: 3bdcf351fc45c5f4b22836d925770d2f32ee9028 [file] [log] [blame]
// 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 <stddef.h>
#include <stdint.h>
#include <string>
#include "base/bind_helpers.h"
#include "base/stl_util.h"
#include "base/time/time.h"
#include "base/values.h"
#include "components/prefs/json_pref_store.h"
#include "components/prefs/mock_pref_change_callback.h"
#include "components/prefs/pref_change_registrar.h"
#include "components/prefs/pref_notifier_impl.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service_factory.h"
#include "components/prefs/pref_value_store.h"
#include "components/prefs/testing_pref_service.h"
#include "components/prefs/testing_pref_store.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
using testing::_;
using testing::Mock;
namespace {
const char kPrefName[] = "pref.name";
const char kManagedPref[] = "managed_pref";
const char kRecommendedPref[] = "recommended_pref";
const char kSupervisedPref[] = "supervised_pref";
} // namespace
TEST(PrefServiceTest, NoObserverFire) {
TestingPrefServiceSimple prefs;
const char pref_name[] = "homepage";
prefs.registry()->RegisterStringPref(pref_name, std::string());
const char new_pref_value[] = "http://www.google.com/";
MockPrefChangeCallback obs(&prefs);
PrefChangeRegistrar registrar;
registrar.Init(&prefs);
registrar.Add(pref_name, obs.GetCallback());
// This should fire the checks in MockPrefChangeCallback::OnPreferenceChanged.
const base::Value expected_value(new_pref_value);
obs.Expect(pref_name, &expected_value);
prefs.SetString(pref_name, new_pref_value);
Mock::VerifyAndClearExpectations(&obs);
// Setting the pref to the same value should not set the pref value a second
// time.
EXPECT_CALL(obs, OnPreferenceChanged(_)).Times(0);
prefs.SetString(pref_name, new_pref_value);
Mock::VerifyAndClearExpectations(&obs);
// Clearing the pref should cause the pref to fire.
const base::Value expected_default_value((std::string()));
obs.Expect(pref_name, &expected_default_value);
prefs.ClearPref(pref_name);
Mock::VerifyAndClearExpectations(&obs);
// Clearing the pref again should not cause the pref to fire.
EXPECT_CALL(obs, OnPreferenceChanged(_)).Times(0);
prefs.ClearPref(pref_name);
Mock::VerifyAndClearExpectations(&obs);
}
TEST(PrefServiceTest, HasPrefPath) {
TestingPrefServiceSimple prefs;
const char path[] = "fake.path";
// Shouldn't initially have a path.
EXPECT_FALSE(prefs.HasPrefPath(path));
// Register the path. This doesn't set a value, so the path still shouldn't
// exist.
prefs.registry()->RegisterStringPref(path, std::string());
EXPECT_FALSE(prefs.HasPrefPath(path));
// Set a value and make sure we have a path.
prefs.SetString(path, "blah");
EXPECT_TRUE(prefs.HasPrefPath(path));
}
TEST(PrefServiceTest, Observers) {
const char pref_name[] = "homepage";
TestingPrefServiceSimple prefs;
prefs.SetUserPref(pref_name,
std::make_unique<base::Value>("http://www.cnn.com"));
prefs.registry()->RegisterStringPref(pref_name, std::string());
const char new_pref_value[] = "http://www.google.com/";
const base::Value expected_new_pref_value(new_pref_value);
MockPrefChangeCallback obs(&prefs);
PrefChangeRegistrar registrar;
registrar.Init(&prefs);
registrar.Add(pref_name, obs.GetCallback());
PrefChangeRegistrar registrar_two;
registrar_two.Init(&prefs);
// This should fire the checks in MockPrefChangeCallback::OnPreferenceChanged.
obs.Expect(pref_name, &expected_new_pref_value);
prefs.SetString(pref_name, new_pref_value);
Mock::VerifyAndClearExpectations(&obs);
// Now try adding a second pref observer.
const char new_pref_value2[] = "http://www.youtube.com/";
const base::Value expected_new_pref_value2(new_pref_value2);
MockPrefChangeCallback obs2(&prefs);
obs.Expect(pref_name, &expected_new_pref_value2);
obs2.Expect(pref_name, &expected_new_pref_value2);
registrar_two.Add(pref_name, obs2.GetCallback());
// This should fire the checks in obs and obs2.
prefs.SetString(pref_name, new_pref_value2);
Mock::VerifyAndClearExpectations(&obs);
Mock::VerifyAndClearExpectations(&obs2);
// Set a recommended value.
const base::Value recommended_pref_value("http://www.gmail.com/");
obs.Expect(pref_name, &expected_new_pref_value2);
obs2.Expect(pref_name, &expected_new_pref_value2);
// This should fire the checks in obs and obs2 but with an unchanged value
// as the recommended value is being overridden by the user-set value.
prefs.SetRecommendedPref(pref_name, recommended_pref_value.CreateDeepCopy());
Mock::VerifyAndClearExpectations(&obs);
Mock::VerifyAndClearExpectations(&obs2);
// Make sure obs2 still works after removing obs.
registrar.Remove(pref_name);
EXPECT_CALL(obs, OnPreferenceChanged(_)).Times(0);
obs2.Expect(pref_name, &expected_new_pref_value);
// This should only fire the observer in obs2.
prefs.SetString(pref_name, new_pref_value);
Mock::VerifyAndClearExpectations(&obs);
Mock::VerifyAndClearExpectations(&obs2);
}
// Make sure that if a preference changes type, so the wrong type is stored in
// the user pref file, it uses the correct fallback value instead.
TEST(PrefServiceTest, GetValueChangedType) {
const int kTestValue = 10;
TestingPrefServiceSimple prefs;
prefs.registry()->RegisterIntegerPref(kPrefName, kTestValue);
// Check falling back to a recommended value.
prefs.SetUserPref(kPrefName, std::make_unique<base::Value>("not an integer"));
const PrefService::Preference* pref = prefs.FindPreference(kPrefName);
ASSERT_TRUE(pref);
const base::Value* value = pref->GetValue();
ASSERT_TRUE(value);
EXPECT_EQ(base::Value::Type::INTEGER, value->type());
int actual_int_value = -1;
EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
EXPECT_EQ(kTestValue, actual_int_value);
}
TEST(PrefServiceTest, GetValueAndGetRecommendedValue) {
const int kDefaultValue = 5;
const int kUserValue = 10;
const int kRecommendedValue = 15;
TestingPrefServiceSimple prefs;
prefs.registry()->RegisterIntegerPref(kPrefName, kDefaultValue);
// Create pref with a default value only.
const PrefService::Preference* pref = prefs.FindPreference(kPrefName);
ASSERT_TRUE(pref);
// Check that GetValue() returns the default value.
const base::Value* value = pref->GetValue();
ASSERT_TRUE(value);
EXPECT_EQ(base::Value::Type::INTEGER, value->type());
int actual_int_value = -1;
EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
EXPECT_EQ(kDefaultValue, actual_int_value);
// Check that GetRecommendedValue() returns no value.
value = pref->GetRecommendedValue();
ASSERT_FALSE(value);
// Set a user-set value.
prefs.SetUserPref(kPrefName, std::make_unique<base::Value>(kUserValue));
// Check that GetValue() returns the user-set value.
value = pref->GetValue();
ASSERT_TRUE(value);
EXPECT_EQ(base::Value::Type::INTEGER, value->type());
actual_int_value = -1;
EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
EXPECT_EQ(kUserValue, actual_int_value);
// Check that GetRecommendedValue() returns no value.
value = pref->GetRecommendedValue();
ASSERT_FALSE(value);
// Set a recommended value.
prefs.SetRecommendedPref(kPrefName,
std::make_unique<base::Value>(kRecommendedValue));
// Check that GetValue() returns the user-set value.
value = pref->GetValue();
ASSERT_TRUE(value);
EXPECT_EQ(base::Value::Type::INTEGER, value->type());
actual_int_value = -1;
EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
EXPECT_EQ(kUserValue, actual_int_value);
// Check that GetRecommendedValue() returns the recommended value.
value = pref->GetRecommendedValue();
ASSERT_TRUE(value);
EXPECT_EQ(base::Value::Type::INTEGER, value->type());
actual_int_value = -1;
EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
EXPECT_EQ(kRecommendedValue, actual_int_value);
// Remove the user-set value.
prefs.RemoveUserPref(kPrefName);
// Check that GetValue() returns the recommended value.
value = pref->GetValue();
ASSERT_TRUE(value);
EXPECT_EQ(base::Value::Type::INTEGER, value->type());
actual_int_value = -1;
EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
EXPECT_EQ(kRecommendedValue, actual_int_value);
// Check that GetRecommendedValue() returns the recommended value.
value = pref->GetRecommendedValue();
ASSERT_TRUE(value);
EXPECT_EQ(base::Value::Type::INTEGER, value->type());
actual_int_value = -1;
EXPECT_TRUE(value->GetAsInteger(&actual_int_value));
EXPECT_EQ(kRecommendedValue, actual_int_value);
}
TEST(PrefServiceTest, SetTimeValue_RegularTime) {
TestingPrefServiceSimple prefs;
// Register a null time as the default.
prefs.registry()->RegisterTimePref(kPrefName, base::Time());
EXPECT_TRUE(prefs.GetTime(kPrefName).is_null());
// Set a time and make sure that we can read it without any loss of precision.
const base::Time time = base::Time::Now();
prefs.SetTime(kPrefName, time);
EXPECT_EQ(time, prefs.GetTime(kPrefName));
}
TEST(PrefServiceTest, SetTimeValue_NullTime) {
TestingPrefServiceSimple prefs;
// Register a non-null time as the default.
const base::Time default_time = base::Time::FromDeltaSinceWindowsEpoch(
base::TimeDelta::FromMicroseconds(12345));
prefs.registry()->RegisterTimePref(kPrefName, default_time);
EXPECT_FALSE(prefs.GetTime(kPrefName).is_null());
// Set a null time and make sure that it remains null upon deserialization.
prefs.SetTime(kPrefName, base::Time());
EXPECT_TRUE(prefs.GetTime(kPrefName).is_null());
}
TEST(PrefServiceTest, SetTimeDeltaValue_RegularTimeDelta) {
TestingPrefServiceSimple prefs;
// Register a zero time delta as the default.
prefs.registry()->RegisterTimeDeltaPref(kPrefName, base::TimeDelta());
EXPECT_TRUE(prefs.GetTimeDelta(kPrefName).is_zero());
// Set a time delta and make sure that we can read it without any loss of
// precision.
const base::TimeDelta delta = base::Time::Now() - base::Time();
prefs.SetTimeDelta(kPrefName, delta);
EXPECT_EQ(delta, prefs.GetTimeDelta(kPrefName));
}
TEST(PrefServiceTest, SetTimeDeltaValue_ZeroTimeDelta) {
TestingPrefServiceSimple prefs;
// Register a non-zero time delta as the default.
const base::TimeDelta default_delta =
base::TimeDelta::FromMicroseconds(12345);
prefs.registry()->RegisterTimeDeltaPref(kPrefName, default_delta);
EXPECT_FALSE(prefs.GetTimeDelta(kPrefName).is_zero());
// Set a zero time delta and make sure that it remains zero upon
// deserialization.
prefs.SetTimeDelta(kPrefName, base::TimeDelta());
EXPECT_TRUE(prefs.GetTimeDelta(kPrefName).is_zero());
}
// A PrefStore which just stores the last write flags that were used to write
// values to it.
class WriteFlagChecker : public TestingPrefStore {
public:
WriteFlagChecker() {}
void ReportValueChanged(const std::string& key, uint32_t flags) override {
SetLastWriteFlags(flags);
}
void SetValue(const std::string& key,
std::unique_ptr<base::Value> value,
uint32_t flags) override {
SetLastWriteFlags(flags);
}
void SetValueSilently(const std::string& key,
std::unique_ptr<base::Value> value,
uint32_t flags) override {
SetLastWriteFlags(flags);
}
void RemoveValue(const std::string& key, uint32_t flags) override {
SetLastWriteFlags(flags);
}
uint32_t GetLastFlagsAndClear() {
CHECK(last_write_flags_set_);
uint32_t result = last_write_flags_;
last_write_flags_set_ = false;
last_write_flags_ = WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS;
return result;
}
bool last_write_flags_set() { return last_write_flags_set_; }
private:
~WriteFlagChecker() override {}
void SetLastWriteFlags(uint32_t flags) {
CHECK(!last_write_flags_set_);
last_write_flags_set_ = true;
last_write_flags_ = flags;
}
bool last_write_flags_set_ = false;
uint32_t last_write_flags_ = WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS;
};
TEST(PrefServiceTest, WriteablePrefStoreFlags) {
scoped_refptr<WriteFlagChecker> flag_checker(new WriteFlagChecker);
scoped_refptr<PrefRegistrySimple> registry(new PrefRegistrySimple);
PrefServiceFactory factory;
factory.set_user_prefs(flag_checker);
std::unique_ptr<PrefService> prefs(factory.Create(registry.get()));
// The first 8 bits of write flags are reserved for subclasses. Create a
// custom flag in this range
uint32_t kCustomRegistrationFlag = 1 << 2;
// A map of the registration flags that will be tested and the write flags
// they are expected to convert to.
struct RegistrationToWriteFlags {
const char* pref_name;
uint32_t registration_flags;
uint32_t write_flags;
};
const RegistrationToWriteFlags kRegistrationToWriteFlags[] = {
{"none",
PrefRegistry::NO_REGISTRATION_FLAGS,
WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS},
{"lossy",
PrefRegistry::LOSSY_PREF,
WriteablePrefStore::LOSSY_PREF_WRITE_FLAG},
{"custom",
kCustomRegistrationFlag,
WriteablePrefStore::DEFAULT_PREF_WRITE_FLAGS},
{"lossyandcustom",
PrefRegistry::LOSSY_PREF | kCustomRegistrationFlag,
WriteablePrefStore::LOSSY_PREF_WRITE_FLAG}};
for (size_t i = 0; i < base::size(kRegistrationToWriteFlags); ++i) {
RegistrationToWriteFlags entry = kRegistrationToWriteFlags[i];
registry->RegisterDictionaryPref(entry.pref_name,
entry.registration_flags);
SCOPED_TRACE("Currently testing pref with name: " +
std::string(entry.pref_name));
prefs->GetMutableUserPref(entry.pref_name, base::Value::Type::DICTIONARY);
EXPECT_TRUE(flag_checker->last_write_flags_set());
EXPECT_EQ(entry.write_flags, flag_checker->GetLastFlagsAndClear());
prefs->ReportUserPrefChanged(entry.pref_name);
EXPECT_TRUE(flag_checker->last_write_flags_set());
EXPECT_EQ(entry.write_flags, flag_checker->GetLastFlagsAndClear());
prefs->ClearPref(entry.pref_name);
EXPECT_TRUE(flag_checker->last_write_flags_set());
EXPECT_EQ(entry.write_flags, flag_checker->GetLastFlagsAndClear());
prefs->SetUserPrefValue(entry.pref_name,
std::make_unique<base::DictionaryValue>());
EXPECT_TRUE(flag_checker->last_write_flags_set());
EXPECT_EQ(entry.write_flags, flag_checker->GetLastFlagsAndClear());
}
}
class PrefServiceSetValueTest : public testing::Test {
protected:
static const char kName[];
static const char kValue[];
PrefServiceSetValueTest() : observer_(&prefs_) {}
TestingPrefServiceSimple prefs_;
MockPrefChangeCallback observer_;
};
const char PrefServiceSetValueTest::kName[] = "name";
const char PrefServiceSetValueTest::kValue[] = "value";
TEST_F(PrefServiceSetValueTest, SetStringValue) {
const char default_string[] = "default";
const base::Value default_value(default_string);
prefs_.registry()->RegisterStringPref(kName, default_string);
PrefChangeRegistrar registrar;
registrar.Init(&prefs_);
registrar.Add(kName, observer_.GetCallback());
// Changing the controlling store from default to user triggers notification.
observer_.Expect(kName, &default_value);
prefs_.Set(kName, default_value);
Mock::VerifyAndClearExpectations(&observer_);
EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
prefs_.Set(kName, default_value);
Mock::VerifyAndClearExpectations(&observer_);
base::Value new_value(kValue);
observer_.Expect(kName, &new_value);
prefs_.Set(kName, new_value);
Mock::VerifyAndClearExpectations(&observer_);
}
TEST_F(PrefServiceSetValueTest, SetDictionaryValue) {
prefs_.registry()->RegisterDictionaryPref(kName);
PrefChangeRegistrar registrar;
registrar.Init(&prefs_);
registrar.Add(kName, observer_.GetCallback());
EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
prefs_.RemoveUserPref(kName);
Mock::VerifyAndClearExpectations(&observer_);
base::DictionaryValue new_value;
new_value.SetString(kName, kValue);
observer_.Expect(kName, &new_value);
prefs_.Set(kName, new_value);
Mock::VerifyAndClearExpectations(&observer_);
EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
prefs_.Set(kName, new_value);
Mock::VerifyAndClearExpectations(&observer_);
base::DictionaryValue empty;
observer_.Expect(kName, &empty);
prefs_.Set(kName, empty);
Mock::VerifyAndClearExpectations(&observer_);
}
TEST_F(PrefServiceSetValueTest, SetListValue) {
prefs_.registry()->RegisterListPref(kName);
PrefChangeRegistrar registrar;
registrar.Init(&prefs_);
registrar.Add(kName, observer_.GetCallback());
EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
prefs_.RemoveUserPref(kName);
Mock::VerifyAndClearExpectations(&observer_);
base::ListValue new_value;
new_value.AppendString(kValue);
observer_.Expect(kName, &new_value);
prefs_.Set(kName, new_value);
Mock::VerifyAndClearExpectations(&observer_);
EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
prefs_.Set(kName, new_value);
Mock::VerifyAndClearExpectations(&observer_);
base::ListValue empty;
observer_.Expect(kName, &empty);
prefs_.Set(kName, empty);
Mock::VerifyAndClearExpectations(&observer_);
}
class PrefValueStoreChangeTest : public testing::Test {
protected:
PrefValueStoreChangeTest()
: user_pref_store_(base::MakeRefCounted<TestingPrefStore>()),
pref_registry_(base::MakeRefCounted<PrefRegistrySimple>()) {}
~PrefValueStoreChangeTest() override = default;
void SetUp() override {
auto pref_notifier = std::make_unique<PrefNotifierImpl>();
auto pref_value_store = std::make_unique<PrefValueStore>(
nullptr /* managed_prefs */, nullptr /* supervised_user_prefs */,
nullptr /* extension_prefs */, new TestingPrefStore(),
user_pref_store_.get(), nullptr /* recommended_prefs */,
pref_registry_->defaults().get(), pref_notifier.get());
pref_service_ = std::make_unique<PrefService>(
std::move(pref_notifier), std::move(pref_value_store), user_pref_store_,
pref_registry_, base::DoNothing(), false);
pref_registry_->RegisterIntegerPref(kManagedPref, 1);
pref_registry_->RegisterIntegerPref(kRecommendedPref, 2);
pref_registry_->RegisterIntegerPref(kSupervisedPref, 3);
}
std::unique_ptr<PrefService> pref_service_;
scoped_refptr<TestingPrefStore> user_pref_store_;
scoped_refptr<PrefRegistrySimple> pref_registry_;
};
// Check that value from the new PrefValueStore will be correctly retrieved.
TEST_F(PrefValueStoreChangeTest, ChangePrefValueStore) {
const PrefService::Preference* preference =
pref_service_->FindPreference(kManagedPref);
EXPECT_TRUE(preference->IsDefaultValue());
EXPECT_EQ(base::Value(1), *(preference->GetValue()));
const PrefService::Preference* supervised =
pref_service_->FindPreference(kSupervisedPref);
EXPECT_TRUE(supervised->IsDefaultValue());
EXPECT_EQ(base::Value(3), *(supervised->GetValue()));
const PrefService::Preference* recommended =
pref_service_->FindPreference(kRecommendedPref);
EXPECT_TRUE(recommended->IsDefaultValue());
EXPECT_EQ(base::Value(2), *(recommended->GetValue()));
user_pref_store_->SetInteger(kManagedPref, 10);
EXPECT_TRUE(preference->IsUserControlled());
ASSERT_EQ(base::Value(10), *(preference->GetValue()));
scoped_refptr<TestingPrefStore> managed_pref_store =
base::MakeRefCounted<TestingPrefStore>();
pref_service_->ChangePrefValueStore(
managed_pref_store.get(), nullptr /* supervised_user_prefs */,
nullptr /* extension_prefs */, nullptr /* recommended_prefs */);
EXPECT_TRUE(preference->IsUserControlled());
ASSERT_EQ(base::Value(10), *(preference->GetValue()));
// Test setting a managed pref after overriding the managed PrefStore.
managed_pref_store->SetInteger(kManagedPref, 20);
EXPECT_TRUE(preference->IsManaged());
ASSERT_EQ(base::Value(20), *(preference->GetValue()));
// Test overriding the supervised and recommended PrefStore with already set
// prefs.
scoped_refptr<TestingPrefStore> supervised_pref_store =
base::MakeRefCounted<TestingPrefStore>();
scoped_refptr<TestingPrefStore> recommened_pref_store =
base::MakeRefCounted<TestingPrefStore>();
supervised_pref_store->SetInteger(kManagedPref, 30);
supervised_pref_store->SetInteger(kSupervisedPref, 31);
recommened_pref_store->SetInteger(kManagedPref, 40);
recommened_pref_store->SetInteger(kRecommendedPref, 41);
pref_service_->ChangePrefValueStore(
nullptr /* managed_prefs */, supervised_pref_store.get(),
nullptr /* extension_prefs */, recommened_pref_store.get());
EXPECT_TRUE(preference->IsManaged());
ASSERT_EQ(base::Value(20), *(preference->GetValue()));
EXPECT_TRUE(supervised->IsManagedByCustodian());
EXPECT_EQ(base::Value(31), *(supervised->GetValue()));
EXPECT_TRUE(recommended->IsRecommended());
EXPECT_EQ(base::Value(41), *(recommended->GetValue()));
}
// Tests that PrefChangeRegistrar works after PrefValueStore is changed.
TEST_F(PrefValueStoreChangeTest, PrefChangeRegistrar) {
MockPrefChangeCallback obs(pref_service_.get());
PrefChangeRegistrar registrar;
registrar.Init(pref_service_.get());
registrar.Add(kManagedPref, obs.GetCallback());
registrar.Add(kSupervisedPref, obs.GetCallback());
registrar.Add(kRecommendedPref, obs.GetCallback());
base::Value expected_value(10);
obs.Expect(kManagedPref, &expected_value);
user_pref_store_->SetInteger(kManagedPref, 10);
Mock::VerifyAndClearExpectations(&obs);
expected_value = base::Value(11);
obs.Expect(kRecommendedPref, &expected_value);
user_pref_store_->SetInteger(kRecommendedPref, 11);
Mock::VerifyAndClearExpectations(&obs);
// Test overriding the managed and supervised PrefStore with already set
// prefs.
scoped_refptr<TestingPrefStore> managed_pref_store =
base::MakeRefCounted<TestingPrefStore>();
scoped_refptr<TestingPrefStore> supervised_pref_store =
base::MakeRefCounted<TestingPrefStore>();
// Update |kManagedPref| before changing the PrefValueStore, the
// PrefChangeRegistrar should get notified on |kManagedPref| as its value
// changes.
managed_pref_store->SetInteger(kManagedPref, 20);
// Due to store precedence, the value of |kRecommendedPref| will not be
// changed so PrefChangeRegistrar will not be notified.
managed_pref_store->SetInteger(kRecommendedPref, 11);
supervised_pref_store->SetInteger(kManagedPref, 30);
supervised_pref_store->SetInteger(kRecommendedPref, 21);
expected_value = base::Value(20);
obs.Expect(kManagedPref, &expected_value);
pref_service_->ChangePrefValueStore(
managed_pref_store.get(), supervised_pref_store.get(),
nullptr /* extension_prefs */, nullptr /* recommended_prefs */);
Mock::VerifyAndClearExpectations(&obs);
// Update a pref value after PrefValueStore change, it should also work.
expected_value = base::Value(31);
obs.Expect(kSupervisedPref, &expected_value);
supervised_pref_store->SetInteger(kSupervisedPref, 31);
Mock::VerifyAndClearExpectations(&obs);
}