[SyncFS] Ensure to pass DB in some utilities

chrome/browser/sync_file_system/drive_backend/metadata_database_index_unittest.cc

Index: chrome/browser/sync_file_system/drive_backend/metadata_database_index_unittest.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/metadata_database_index_unittest.cc b/chrome/browser/sync_file_system/drive_backend/metadata_database_index_unittest.cc
index 25a60aed3d5cbe29f514d0373681e3e98fa7f8e7..f10bf710fcafd072a822f7f764c5eddd34712aba 100644
--- a/chrome/browser/sync_file_system/drive_backend/metadata_database_index_unittest.cc
+++ b/chrome/browser/sync_file_system/drive_backend/metadata_database_index_unittest.cc
@@ -6,9 +6,13 @@
 
 #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/leveldb_wrapper.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 "testing/gtest/include/gtest/gtest.h"
+#include "third_party/leveldatabase/src/helpers/memenv/memenv.h"
+#include "third_party/leveldatabase/src/include/leveldb/db.h"
+#include "third_party/leveldatabase/src/include/leveldb/env.h"
 
 namespace sync_file_system {
 namespace drive_backend {
@@ -60,78 +64,99 @@ scoped_ptr<DatabaseContents> CreateTestDatabaseContents() {
 
 }  // namespace
 
-TEST(MetadataDatabaseIndexTest, GetEntryTest) {
-  scoped_ptr<MetadataDatabaseIndex> index =
-      MetadataDatabaseIndex::CreateForTesting(
-          CreateTestDatabaseContents().get());
+class MetadataDatabaseIndexTest : public testing::Test {
+ public:
+  virtual void SetUp() OVERRIDE {
+    in_memory_env_.reset(leveldb::NewMemEnv(leveldb::Env::Default()));
+    InitializeLevelDB();
 
+    contents_ = CreateTestDatabaseContents();
+    index_ = MetadataDatabaseIndex::CreateForTesting(contents_.get(),
+                                                     db_.get());
+  }
+
+  MetadataDatabaseIndex* index() { return index_.get(); }
+
+ private:
+  void InitializeLevelDB() {
+    leveldb::DB* db = NULL;
+    leveldb::Options options;
+    options.create_if_missing = true;
+    options.max_open_files = 0;  // Use minimum.
+    options.env = in_memory_env_.get();
+    leveldb::Status status = leveldb::DB::Open(options, "", &db);
+    ASSERT_TRUE(status.ok());
+
+    db_.reset(new LevelDBWrapper(make_scoped_ptr(db)));
+  }
+
+  scoped_ptr<DatabaseContents> contents_;
+  scoped_ptr<MetadataDatabaseIndex> index_;
+
+  scoped_ptr<leveldb::Env> in_memory_env_;
+  scoped_ptr<LevelDBWrapper> db_;
+};
+
+TEST_F(MetadataDatabaseIndexTest, GetEntryTest) {
   FileTracker tracker;
-  EXPECT_FALSE(index->GetFileTracker(kInvalidTrackerID, NULL));
-  ASSERT_TRUE(index->GetFileTracker(kFileTrackerID, &tracker));
+  EXPECT_FALSE(index()->GetFileTracker(kInvalidTrackerID, NULL));
+  ASSERT_TRUE(index()->GetFileTracker(kFileTrackerID, &tracker));
   EXPECT_EQ(kFileTrackerID, tracker.tracker_id());
   EXPECT_EQ("file_id", tracker.file_id());
 
   FileMetadata metadata;
-  EXPECT_FALSE(index->GetFileMetadata(std::string(), NULL));
-  ASSERT_TRUE(index->GetFileMetadata("file_id", &metadata));
+  EXPECT_FALSE(index()->GetFileMetadata(std::string(), NULL));
+  ASSERT_TRUE(index()->GetFileMetadata("file_id", &metadata));
   EXPECT_EQ("file_id", metadata.file_id());
 }
 
-TEST(MetadataDatabaseIndexTest, IndexLookUpTest) {
-  scoped_ptr<MetadataDatabaseIndex> index =
-      MetadataDatabaseIndex::CreateForTesting(
-          CreateTestDatabaseContents().get());
-
-  TrackerIDSet trackers = index->GetFileTrackerIDsByFileID("file_id");
+TEST_F(MetadataDatabaseIndexTest, IndexLookUpTest) {
+  TrackerIDSet trackers = index()->GetFileTrackerIDsByFileID("file_id");
   EXPECT_EQ(1u, trackers.size());
   EXPECT_TRUE(trackers.has_active());
   EXPECT_EQ(kFileTrackerID, trackers.active_tracker());
 
-  int64 app_root_tracker_id = index->GetAppRootTracker("app_id");
+  int64 app_root_tracker_id = index()->GetAppRootTracker("app_id");
   EXPECT_EQ(kAppRootTrackerID, app_root_tracker_id);
 
-  trackers = index->GetFileTrackerIDsByParentAndTitle(
+  trackers = index()->GetFileTrackerIDsByParentAndTitle(
       app_root_tracker_id, "file");
   EXPECT_EQ(1u, trackers.size());
   EXPECT_TRUE(trackers.has_active());
   EXPECT_EQ(kFileTrackerID, trackers.active_tracker());
 
-  EXPECT_TRUE(index->PickMultiTrackerFileID().empty());
+  EXPECT_TRUE(index()->PickMultiTrackerFileID().empty());
   EXPECT_EQ(kInvalidTrackerID,
-            index->PickMultiBackingFilePath().parent_id);
-  EXPECT_EQ(kPlaceholderTrackerID, index->PickDirtyTracker());
+            index()->PickMultiBackingFilePath().parent_id);
+  EXPECT_EQ(kPlaceholderTrackerID, index()->PickDirtyTracker());
 }
 
-TEST(MetadataDatabaseIndexTest, UpdateTest) {
-  scoped_ptr<MetadataDatabaseIndex> index =
-      MetadataDatabaseIndex::CreateForTesting(
-          CreateTestDatabaseContents().get());
-
-  index->DemoteDirtyTracker(kPlaceholderTrackerID);
-  EXPECT_EQ(kInvalidTrackerID, index->PickDirtyTracker());
-  index->PromoteDemotedDirtyTrackers();
-  EXPECT_EQ(kPlaceholderTrackerID, index->PickDirtyTracker());
+TEST_F(MetadataDatabaseIndexTest, UpdateTest) {
+  index()->DemoteDirtyTracker(kPlaceholderTrackerID);
+  EXPECT_EQ(kInvalidTrackerID, index()->PickDirtyTracker());
+  index()->PromoteDemotedDirtyTrackers();
+  EXPECT_EQ(kPlaceholderTrackerID, index()->PickDirtyTracker());
 
   FileMetadata metadata;
-  ASSERT_TRUE(index->GetFileMetadata("file_id", &metadata));
+  ASSERT_TRUE(index()->GetFileMetadata("file_id", &metadata));
   FileTracker app_root_tracker;
-  ASSERT_TRUE(index->GetFileTracker(kAppRootTrackerID, &app_root_tracker));
+  ASSERT_TRUE(index()->GetFileTracker(kAppRootTrackerID, &app_root_tracker));
 
   int64 new_tracker_id = 100;
   scoped_ptr<FileTracker> new_tracker =
       test_util::CreateTracker(metadata, new_tracker_id, &app_root_tracker);
   new_tracker->set_active(false);
-  index->StoreFileTracker(new_tracker.Pass());
+  index()->StoreFileTracker(new_tracker.Pass());
 
-  EXPECT_EQ("file_id", index->PickMultiTrackerFileID());
+  EXPECT_EQ("file_id", index()->PickMultiTrackerFileID());
   EXPECT_EQ(ParentIDAndTitle(kAppRootTrackerID, std::string("file")),
-            index->PickMultiBackingFilePath());
+            index()->PickMultiBackingFilePath());
 
-  index->RemoveFileMetadata("file_id");
-  index->RemoveFileTracker(kFileTrackerID);
+  index()->RemoveFileMetadata("file_id");
+  index()->RemoveFileTracker(kFileTrackerID);
 
-  EXPECT_FALSE(index->GetFileMetadata("file_id", NULL));
-  EXPECT_FALSE(index->GetFileTracker(kFileTrackerID, NULL));
+  EXPECT_FALSE(index()->GetFileMetadata("file_id", NULL));
+  EXPECT_FALSE(index()->GetFileTracker(kFileTrackerID, NULL));
 }
 
 }  // namespace drive_backend