// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.h"

#include <memory>
#include <utility>

#include "base/files/scoped_temp_dir.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_runner.h"
#include "chrome/browser/sync_file_system/drive_backend/drive_backend_constants.h"
#include "chrome/browser/sync_file_system/drive_backend/drive_backend_test_util.h"
#include "chrome/browser/sync_file_system/drive_backend/fake_drive_service_helper.h"
#include "chrome/browser/sync_file_system/drive_backend/fake_drive_uploader.h"
#include "chrome/browser/sync_file_system/drive_backend/list_changes_task.h"
#include "chrome/browser/sync_file_system/drive_backend/metadata_database.h"
#include "chrome/browser/sync_file_system/drive_backend/metadata_database.pb.h"
#include "chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.h"
#include "chrome/browser/sync_file_system/drive_backend/sync_engine_context.h"
#include "chrome/browser/sync_file_system/drive_backend/sync_engine_initializer.h"
#include "chrome/browser/sync_file_system/drive_backend/sync_task_manager.h"
#include "chrome/browser/sync_file_system/drive_backend/sync_task_token.h"
#include "chrome/browser/sync_file_system/fake_remote_change_processor.h"
#include "chrome/browser/sync_file_system/sync_file_system_test_util.h"
#include "chrome/browser/sync_file_system/syncable_file_system_util.h"
#include "components/drive/drive_api_util.h"
#include "components/drive/drive_uploader.h"
#include "components/drive/service/fake_drive_service.h"
#include "content/public/test/browser_task_environment.h"
#include "google_apis/drive/drive_api_parser.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/leveldatabase/leveldb_chrome.h"

namespace sync_file_system {
namespace drive_backend {

namespace {

storage::FileSystemURL URL(const GURL& origin, const std::string& path) {
  return CreateSyncableFileSystemURL(
      origin, base::FilePath::FromUTF8Unsafe(path));
}

const int kRetryLimit = 100;

}  // namespace

class LocalToRemoteSyncerTest : public testing::Test {
 public:
  LocalToRemoteSyncerTest()
      : task_environment_(content::BrowserTaskEnvironment::IO_MAINLOOP) {}

  LocalToRemoteSyncerTest(const LocalToRemoteSyncerTest&) = delete;
  LocalToRemoteSyncerTest& operator=(const LocalToRemoteSyncerTest&) = delete;

  ~LocalToRemoteSyncerTest() override = default;

  void SetUp() override {
    ASSERT_TRUE(database_dir_.CreateUniqueTempDir());
    in_memory_env_ = leveldb_chrome::NewMemEnv("LocalToRemoteSyncerTest");

    std::unique_ptr<FakeDriveServiceWrapper> fake_drive_service(
        new FakeDriveServiceWrapper);
    std::unique_ptr<drive::DriveUploaderInterface> drive_uploader(
        new FakeDriveUploader(fake_drive_service.get()));
    fake_drive_helper_ = std::make_unique<FakeDriveServiceHelper>(
        fake_drive_service.get(), drive_uploader.get(), kSyncRootFolderTitle);
    remote_change_processor_ = std::make_unique<FakeRemoteChangeProcessor>();

    context_ = std::make_unique<SyncEngineContext>(
        std::move(fake_drive_service), std::move(drive_uploader),
        nullptr /* task_logger */,
        base::SingleThreadTaskRunner::GetCurrentDefault(),
        base::SingleThreadTaskRunner::GetCurrentDefault());
    context_->SetRemoteChangeProcessor(remote_change_processor_.get());

    RegisterSyncableFileSystem();

    sync_task_manager_ = std::make_unique<SyncTaskManager>(
        base::WeakPtr<SyncTaskManager::Client>(),
        10 /* maximum_background_task */,
        base::SingleThreadTaskRunner::GetCurrentDefault());
    sync_task_manager_->Initialize(SYNC_STATUS_OK);
  }

  void TearDown() override {
    sync_task_manager_.reset();
    RevokeSyncableFileSystem();
    fake_drive_helper_.reset();
    context_.reset();
    base::RunLoop().RunUntilIdle();
  }

  void InitializeMetadataDatabase() {
    SyncEngineInitializer* initializer = new SyncEngineInitializer(
        context_.get(), database_dir_.GetPath(), in_memory_env_.get());
    SyncStatusCode status = SYNC_STATUS_UNKNOWN;

    sync_task_manager_->ScheduleSyncTask(
        FROM_HERE, std::unique_ptr<SyncTask>(initializer),
        SyncTaskManager::PRIORITY_MED,
        base::BindOnce(&LocalToRemoteSyncerTest::DidInitializeMetadataDatabase,
                       base::Unretained(this), initializer, &status));

    base::RunLoop().RunUntilIdle();
    EXPECT_EQ(SYNC_STATUS_OK, status);
  }

  void DidInitializeMetadataDatabase(SyncEngineInitializer* initializer,
                                     SyncStatusCode* status_out,
                                     SyncStatusCode status) {
    *status_out = status;
    context_->SetMetadataDatabase(initializer->PassMetadataDatabase());
  }

  void RegisterApp(const std::string& app_id,
                   const std::string& app_root_folder_id) {
    SyncStatusCode status = context_->GetMetadataDatabase()->RegisterApp(
        app_id, app_root_folder_id);
    EXPECT_EQ(SYNC_STATUS_OK, status);
  }

  MetadataDatabase* GetMetadataDatabase() {
    return context_->GetMetadataDatabase();
  }

 protected:
  std::string CreateSyncRoot() {
    std::string sync_root_folder_id;
    EXPECT_EQ(google_apis::HTTP_CREATED,
              fake_drive_helper_->AddOrphanedFolder(
                  kSyncRootFolderTitle, &sync_root_folder_id));
    return sync_root_folder_id;
  }

  std::string CreateRemoteFolder(const std::string& parent_folder_id,
                                 const std::string& title) {
    std::string folder_id;
    EXPECT_EQ(google_apis::HTTP_CREATED,
              fake_drive_helper_->AddFolder(
                  parent_folder_id, title, &folder_id));
    return folder_id;
  }

  std::string CreateRemoteFile(const std::string& parent_folder_id,
                               const std::string& title,
                               const std::string& content) {
    std::string file_id;
    EXPECT_EQ(google_apis::HTTP_SUCCESS,
              fake_drive_helper_->AddFile(
                  parent_folder_id, title, content, &file_id));
    return file_id;
  }

  void DeleteResource(const std::string& file_id) {
    EXPECT_EQ(google_apis::HTTP_NO_CONTENT,
              fake_drive_helper_->DeleteResource(file_id));
  }

  SyncStatusCode RunLocalToRemoteSyncer(FileChange file_change,
                                        const storage::FileSystemURL& url) {
    SyncStatusCode status = SYNC_STATUS_UNKNOWN;
    base::FilePath local_path = base::FilePath::FromUTF8Unsafe("dummy");
    std::unique_ptr<LocalToRemoteSyncer> syncer(new LocalToRemoteSyncer(
        context_.get(),
        SyncFileMetadata(file_change.file_type(), 0, base::Time()), file_change,
        local_path, url));
    syncer->RunPreflight(SyncTaskToken::CreateForTesting(
        CreateResultReceiver(&status)));
    base::RunLoop().RunUntilIdle();
    return status;
  }

  SyncStatusCode ListChanges() {
    SyncStatusCode status = SYNC_STATUS_UNKNOWN;
    sync_task_manager_->ScheduleSyncTask(
        FROM_HERE,
        std::unique_ptr<SyncTask>(new ListChangesTask(context_.get())),
        SyncTaskManager::PRIORITY_MED, CreateResultReceiver(&status));
    base::RunLoop().RunUntilIdle();
    return status;
  }

  SyncStatusCode RunRemoteToLocalSyncer() {
    SyncStatusCode status = SYNC_STATUS_UNKNOWN;
    std::unique_ptr<RemoteToLocalSyncer> syncer(
        new RemoteToLocalSyncer(context_.get()));
    syncer->RunPreflight(SyncTaskToken::CreateForTesting(
        CreateResultReceiver(&status)));
    base::RunLoop().RunUntilIdle();
    return status;
  }

  SyncStatusCode RunRemoteToLocalSyncerUntilIdle() {
    SyncStatusCode status;
    int retry_count = 0;
    do {
      if (retry_count++ > kRetryLimit)
        break;
      status = RunRemoteToLocalSyncer();
    } while (status == SYNC_STATUS_OK ||
             status == SYNC_STATUS_RETRY ||
             GetMetadataDatabase()->PromoteDemotedTrackers());
    EXPECT_EQ(SYNC_STATUS_NO_CHANGE_TO_SYNC, status);
    return status;
  }

  std::vector<std::unique_ptr<google_apis::FileResource>>
  GetResourceEntriesForParentAndTitle(const std::string& parent_folder_id,
                                      const std::string& title) {
    std::vector<std::unique_ptr<google_apis::FileResource>> entries;
    EXPECT_EQ(google_apis::HTTP_SUCCESS,
              fake_drive_helper_->SearchByTitle(
                  parent_folder_id, title, &entries));
    return entries;
  }

  std::string GetFileIDForParentAndTitle(const std::string& parent_folder_id,
                                         const std::string& title) {
    std::vector<std::unique_ptr<google_apis::FileResource>> entries =
        GetResourceEntriesForParentAndTitle(parent_folder_id, title);
    if (entries.size() != 1)
      return std::string();
    return entries[0]->file_id();
  }

  void VerifyTitleUniqueness(
      const std::string& parent_folder_id,
      const std::string& title,
      test_util::FileResourceKind kind) {
    std::vector<std::unique_ptr<google_apis::FileResource>> entries;
    EXPECT_EQ(google_apis::HTTP_SUCCESS,
              fake_drive_helper_->SearchByTitle(
                  parent_folder_id, title, &entries));
    ASSERT_EQ(1u, entries.size());
    EXPECT_EQ(kind, test_util::GetFileResourceKind(*entries[0]));
  }

  void VerifyFileDeletion(const std::string& parent_folder_id,
                          const std::string& title) {
    std::vector<std::unique_ptr<google_apis::FileResource>> entries;
    EXPECT_EQ(google_apis::HTTP_SUCCESS,
              fake_drive_helper_->SearchByTitle(
                  parent_folder_id, title, &entries));
    EXPECT_TRUE(entries.empty());
  }

 private:
  content::BrowserTaskEnvironment task_environment_;
  base::ScopedTempDir database_dir_;
  std::unique_ptr<leveldb::Env> in_memory_env_;

  std::unique_ptr<SyncEngineContext> context_;
  std::unique_ptr<FakeDriveServiceHelper> fake_drive_helper_;
  std::unique_ptr<FakeRemoteChangeProcessor> remote_change_processor_;
  std::unique_ptr<SyncTaskManager> sync_task_manager_;
};

TEST_F(LocalToRemoteSyncerTest, CreateFile) {
  const GURL kOrigin("chrome-extension://example");
  const std::string sync_root = CreateSyncRoot();
  const std::string app_root = CreateRemoteFolder(sync_root, kOrigin.GetHost());
  InitializeMetadataDatabase();
  RegisterApp(kOrigin.GetHost(), app_root);

  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "file1")));
  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_DIRECTORY),
      URL(kOrigin, "folder")));
  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "folder/file2")));

  std::string folder_id = GetFileIDForParentAndTitle(app_root, "folder");
  ASSERT_FALSE(folder_id.empty());

  VerifyTitleUniqueness(
      app_root, "file1", test_util::RESOURCE_KIND_FILE);
  VerifyTitleUniqueness(
      app_root, "folder", test_util::RESOURCE_KIND_FOLDER);
  VerifyTitleUniqueness(
      folder_id, "file2", test_util::RESOURCE_KIND_FILE);
}

TEST_F(LocalToRemoteSyncerTest, CreateFileOnMissingPath) {
  const GURL kOrigin("chrome-extension://example");
  const std::string sync_root = CreateSyncRoot();
  const std::string app_root = CreateRemoteFolder(sync_root, kOrigin.GetHost());
  InitializeMetadataDatabase();
  RegisterApp(kOrigin.GetHost(), app_root);

  // Run the syncer 3 times to create missing folder1 and folder2.
  EXPECT_EQ(SYNC_STATUS_RETRY, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "folder1/folder2/file")));
  EXPECT_EQ(SYNC_STATUS_RETRY, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "folder1/folder2/file")));
  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "folder1/folder2/file")));

  std::string folder_id1 = GetFileIDForParentAndTitle(app_root, "folder1");
  ASSERT_FALSE(folder_id1.empty());
  std::string folder_id2 = GetFileIDForParentAndTitle(folder_id1, "folder2");
  ASSERT_FALSE(folder_id2.empty());

  VerifyTitleUniqueness(
      app_root, "folder1", test_util::RESOURCE_KIND_FOLDER);
  VerifyTitleUniqueness(
      folder_id1, "folder2", test_util::RESOURCE_KIND_FOLDER);
  VerifyTitleUniqueness(
      folder_id2, "file", test_util::RESOURCE_KIND_FILE);
}

TEST_F(LocalToRemoteSyncerTest, DeleteFile) {
  const GURL kOrigin("chrome-extension://example");
  const std::string sync_root = CreateSyncRoot();
  const std::string app_root = CreateRemoteFolder(sync_root, kOrigin.GetHost());
  InitializeMetadataDatabase();
  RegisterApp(kOrigin.GetHost(), app_root);

  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "file")));
  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_DIRECTORY),
      URL(kOrigin, "folder")));

  VerifyTitleUniqueness(
      app_root, "file", test_util::RESOURCE_KIND_FILE);
  VerifyTitleUniqueness(
      app_root, "folder", test_util::RESOURCE_KIND_FOLDER);

  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_DELETE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "file")));
  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_DELETE,
                 SYNC_FILE_TYPE_DIRECTORY),
      URL(kOrigin, "folder")));

  VerifyFileDeletion(app_root, "file");
  VerifyFileDeletion(app_root, "folder");
}

TEST_F(LocalToRemoteSyncerTest, Conflict_CreateFileOnFolder) {
  const GURL kOrigin("chrome-extension://example");
  const std::string sync_root = CreateSyncRoot();
  const std::string app_root = CreateRemoteFolder(sync_root, kOrigin.GetHost());
  InitializeMetadataDatabase();
  RegisterApp(kOrigin.GetHost(), app_root);

  CreateRemoteFolder(app_root, "foo");
  EXPECT_EQ(SYNC_STATUS_OK, ListChanges());
  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "foo")));

  // There should exist both file and folder on remote.
  std::vector<std::unique_ptr<google_apis::FileResource>> entries =
      GetResourceEntriesForParentAndTitle(app_root, "foo");
  ASSERT_EQ(2u, entries.size());
  EXPECT_EQ(test_util::RESOURCE_KIND_FOLDER,
            test_util::GetFileResourceKind(*entries[0]));
  EXPECT_EQ(test_util::RESOURCE_KIND_FILE,
            test_util::GetFileResourceKind(*entries[1]));
}

TEST_F(LocalToRemoteSyncerTest, Conflict_CreateFolderOnFile) {
  const GURL kOrigin("chrome-extension://example");
  const std::string sync_root = CreateSyncRoot();
  const std::string app_root = CreateRemoteFolder(sync_root, kOrigin.GetHost());
  InitializeMetadataDatabase();
  RegisterApp(kOrigin.GetHost(), app_root);

  CreateRemoteFile(app_root, "foo", "data");
  EXPECT_EQ(SYNC_STATUS_OK, ListChanges());

  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_DIRECTORY),
      URL(kOrigin, "foo")));

  // There should exist both file and folder on remote.
  std::vector<std::unique_ptr<google_apis::FileResource>> entries =
      GetResourceEntriesForParentAndTitle(app_root, "foo");
  ASSERT_EQ(2u, entries.size());
  EXPECT_EQ(test_util::RESOURCE_KIND_FILE,
            test_util::GetFileResourceKind(*entries[0]));
  EXPECT_EQ(test_util::RESOURCE_KIND_FOLDER,
            test_util::GetFileResourceKind(*entries[1]));
}

TEST_F(LocalToRemoteSyncerTest, Conflict_CreateFileOnFile) {
  const GURL kOrigin("chrome-extension://example");
  const std::string sync_root = CreateSyncRoot();
  const std::string app_root = CreateRemoteFolder(sync_root, kOrigin.GetHost());
  InitializeMetadataDatabase();
  RegisterApp(kOrigin.GetHost(), app_root);

  CreateRemoteFile(app_root, "foo", "data");
  EXPECT_EQ(SYNC_STATUS_OK, ListChanges());

  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "foo")));

  // There should exist both files on remote.
  std::vector<std::unique_ptr<google_apis::FileResource>> entries =
      GetResourceEntriesForParentAndTitle(app_root, "foo");
  ASSERT_EQ(2u, entries.size());
  EXPECT_EQ(test_util::RESOURCE_KIND_FILE,
            test_util::GetFileResourceKind(*entries[0]));
  EXPECT_EQ(test_util::RESOURCE_KIND_FILE,
            test_util::GetFileResourceKind(*entries[1]));
}

TEST_F(LocalToRemoteSyncerTest, Conflict_UpdateDeleteOnFile) {
  const GURL kOrigin("chrome-extension://example");
  const std::string sync_root = CreateSyncRoot();
  const std::string app_root = CreateRemoteFolder(sync_root, kOrigin.GetHost());
  InitializeMetadataDatabase();
  RegisterApp(kOrigin.GetHost(), app_root);

  const std::string file_id = CreateRemoteFile(app_root, "foo", "data");
  EXPECT_EQ(SYNC_STATUS_OK, ListChanges());
  EXPECT_EQ(SYNC_STATUS_NO_CHANGE_TO_SYNC,
            RunRemoteToLocalSyncerUntilIdle());

  DeleteResource(file_id);

  EXPECT_EQ(SYNC_STATUS_FILE_BUSY, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "foo")));
  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "foo")));

  std::vector<std::unique_ptr<google_apis::FileResource>> entries =
      GetResourceEntriesForParentAndTitle(app_root, "foo");
  ASSERT_EQ(1u, entries.size());
  EXPECT_EQ(test_util::RESOURCE_KIND_FILE,
            test_util::GetFileResourceKind(*entries[0]));
  EXPECT_TRUE(!entries[0]->labels().is_trashed());
  EXPECT_NE(file_id, entries[0]->file_id());
}

TEST_F(LocalToRemoteSyncerTest, Conflict_CreateDeleteOnFile) {
  const GURL kOrigin("chrome-extension://example");
  const std::string sync_root = CreateSyncRoot();
  const std::string app_root = CreateRemoteFolder(sync_root, kOrigin.GetHost());
  InitializeMetadataDatabase();
  RegisterApp(kOrigin.GetHost(), app_root);

  const std::string file_id = CreateRemoteFile(app_root, "foo", "data");
  EXPECT_EQ(SYNC_STATUS_OK, ListChanges());
  EXPECT_EQ(SYNC_STATUS_NO_CHANGE_TO_SYNC,
            RunRemoteToLocalSyncerUntilIdle());

  DeleteResource(file_id);

  EXPECT_EQ(SYNC_STATUS_OK, ListChanges());

  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_FILE),
      URL(kOrigin, "foo")));

  std::vector<std::unique_ptr<google_apis::FileResource>> entries =
      GetResourceEntriesForParentAndTitle(app_root, "foo");
  ASSERT_EQ(1u, entries.size());
  EXPECT_EQ(test_util::RESOURCE_KIND_FILE,
            test_util::GetFileResourceKind(*entries[0]));
  EXPECT_TRUE(!entries[0]->labels().is_trashed());
  EXPECT_NE(file_id, entries[0]->file_id());
}

TEST_F(LocalToRemoteSyncerTest, Conflict_CreateFolderOnFolder) {
  const GURL kOrigin("chrome-extension://example");
  const std::string sync_root = CreateSyncRoot();
  const std::string app_root = CreateRemoteFolder(sync_root, kOrigin.GetHost());
  InitializeMetadataDatabase();
  RegisterApp(kOrigin.GetHost(), app_root);

  const std::string folder_id = CreateRemoteFolder(app_root, "foo");

  EXPECT_EQ(SYNC_STATUS_OK, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_DIRECTORY),
      URL(kOrigin, "foo")));

  std::vector<std::unique_ptr<google_apis::FileResource>> entries =
      GetResourceEntriesForParentAndTitle(app_root, "foo");
  ASSERT_EQ(2u, entries.size());
  EXPECT_EQ(test_util::RESOURCE_KIND_FOLDER,
            test_util::GetFileResourceKind(*entries[0]));
  EXPECT_EQ(test_util::RESOURCE_KIND_FOLDER,
            test_util::GetFileResourceKind(*entries[1]));
  EXPECT_TRUE(!entries[0]->labels().is_trashed());
  EXPECT_TRUE(!entries[1]->labels().is_trashed());
  EXPECT_TRUE(folder_id == entries[0]->file_id() ||
              folder_id == entries[1]->file_id());

  TrackerIDSet trackers;
  EXPECT_TRUE(GetMetadataDatabase()->FindTrackersByFileID(
      folder_id, &trackers));
  EXPECT_EQ(1u, trackers.size());
  ASSERT_TRUE(trackers.has_active());
}

TEST_F(LocalToRemoteSyncerTest, AppRootDeletion) {
  const GURL kOrigin("chrome-extension://example");
  const std::string sync_root = CreateSyncRoot();
  const std::string app_root = CreateRemoteFolder(sync_root, kOrigin.GetHost());
  InitializeMetadataDatabase();
  RegisterApp(kOrigin.GetHost(), app_root);

  DeleteResource(app_root);
  EXPECT_EQ(SYNC_STATUS_OK, ListChanges());
  EXPECT_EQ(SYNC_STATUS_NO_CHANGE_TO_SYNC,
            RunRemoteToLocalSyncerUntilIdle());

  EXPECT_EQ(SYNC_STATUS_UNKNOWN_ORIGIN, RunLocalToRemoteSyncer(
      FileChange(FileChange::FILE_CHANGE_ADD_OR_UPDATE,
                 SYNC_FILE_TYPE_DIRECTORY),
      URL(kOrigin, "foo")));

  // SyncEngine will re-register the app and resurrect the app root later.
}

}  // namespace drive_backend
}  // namespace sync_file_system