[Sync] Split UserEventService into interface and impl, add fake impl, add unit tests.

components/sync/user_events/user_event_service_unittest.cc

-// Copyright 2017 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/sync/user_events/user_event_service.h"
-
-#include "base/memory/ptr_util.h"
-#include "base/message_loop/message_loop.h"
-#include "base/test/scoped_feature_list.h"
-#include "components/sync/base/model_type.h"
-#include "components/sync/driver/fake_sync_service.h"
-#include "components/sync/driver/sync_driver_switches.h"
-#include "components/sync/model/model_type_store_test_util.h"
-#include "components/sync/model/recording_model_type_change_processor.h"
-#include "components/sync/protocol/sync.pb.h"
-#include "components/sync/user_events/user_event_sync_bridge.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-using sync_pb::UserEventSpecifics;
-
-namespace syncer {
-
-namespace {
-
-class TestSyncService : public FakeSyncService {
- public:
-  TestSyncService(bool is_engine_initialized, ModelTypeSet preferred_data_types)
-      : is_engine_initialized_(is_engine_initialized),
-        preferred_data_types_(preferred_data_types) {}
-
-  bool IsEngineInitialized() const override { return is_engine_initialized_; }
-
-  ModelTypeSet GetPreferredDataTypes() const override {
-    return preferred_data_types_;
-  }
-
- private:
-  bool is_engine_initialized_;
-  ModelTypeSet preferred_data_types_;
-};
-
-class UserEventServiceTest : public testing::Test {
- protected:
-  UserEventServiceTest() {
-    scoped_feature_list_ = base::MakeUnique<base::test::ScopedFeatureList>();
-    scoped_feature_list_->InitAndEnableFeature(switches::kSyncUserEvents);
-  }
-
-  std::unique_ptr<UserEventSyncBridge> MakeBridge() {
-    return base::MakeUnique<UserEventSyncBridge>(
-        ModelTypeStoreTestUtil::FactoryForInMemoryStoreForTest(),
-        RecordingModelTypeChangeProcessor::FactoryForBridgeTest(&processor_));
-  }
-
-  const RecordingModelTypeChangeProcessor& processor() { return *processor_; }
-
-  void DisableUserEvents() {
-    scoped_feature_list_ = base::MakeUnique<base::test::ScopedFeatureList>();
-    scoped_feature_list_->Init();
-  }
-
- private:
-  std::unique_ptr<base::test::ScopedFeatureList> scoped_feature_list_;
-  RecordingModelTypeChangeProcessor* processor_;
-  base::MessageLoop message_loop_;
-};
-
-TEST_F(UserEventServiceTest, ShouldNotRecordNoSync) {
-  UserEventService service(nullptr, MakeBridge());
-  service.RecordUserEvent(base::MakeUnique<UserEventSpecifics>());
-  EXPECT_EQ(0u, processor().put_multimap().size());
-}
-
-TEST_F(UserEventServiceTest, ShouldNotRecordFeatureIsDisabled) {
-  DisableUserEvents();
-  TestSyncService sync_service(false, ModelTypeSet(HISTORY_DELETE_DIRECTIVES));
-  UserEventService service(&sync_service, MakeBridge());
-  service.RecordUserEvent(base::MakeUnique<UserEventSpecifics>());
-  EXPECT_EQ(0u, processor().put_multimap().size());
-}
-
-TEST_F(UserEventServiceTest, ShouldNotRecordNoHistory) {
-  TestSyncService sync_service(true, ModelTypeSet());
-  UserEventService service(&sync_service, MakeBridge());
-  service.RecordUserEvent(base::MakeUnique<UserEventSpecifics>());
-  EXPECT_EQ(0u, processor().put_multimap().size());
-}
-
-TEST_F(UserEventServiceTest, ShouldNotRecordEngineOff) {
-  TestSyncService sync_service(false, ModelTypeSet(HISTORY_DELETE_DIRECTIVES));
-  UserEventService service(&sync_service, MakeBridge());
-  service.RecordUserEvent(base::MakeUnique<UserEventSpecifics>());
-  EXPECT_EQ(0u, processor().put_multimap().size());
-}
-
-TEST_F(UserEventServiceTest, ShouldRecord) {
-  TestSyncService sync_service(true, ModelTypeSet(HISTORY_DELETE_DIRECTIVES));
-  UserEventService service(&sync_service, MakeBridge());
-  service.RecordUserEvent(base::MakeUnique<UserEventSpecifics>());
-  EXPECT_EQ(1u, processor().put_multimap().size());
-}
-
-TEST_F(UserEventServiceTest, SessionIdIsDifferent) {
-  TestSyncService sync_service(true, ModelTypeSet(HISTORY_DELETE_DIRECTIVES));
-
-  UserEventService service1(&sync_service, MakeBridge());
-  service1.RecordUserEvent(base::MakeUnique<UserEventSpecifics>());
-  ASSERT_EQ(1u, processor().put_multimap().size());
-  auto put1 = processor().put_multimap().begin();
-  int64_t session_id1 = put1->second->specifics.user_event().session_id();
-
-  UserEventService service2(&sync_service, MakeBridge());
-  service2.RecordUserEvent(base::MakeUnique<UserEventSpecifics>());
-  // The object processor() points to has changed to be |service2|'s processor.
-  ASSERT_EQ(1u, processor().put_multimap().size());
-  auto put2 = processor().put_multimap().begin();
-  int64_t session_id2 = put2->second->specifics.user_event().session_id();
-
-  EXPECT_NE(session_id1, session_id2);
-}
-
-}  // namespace
-
-}  // namespace syncer