typedef struct GCSFile {
  const std::string path;
  const bool is_cache_enable;
  const uint64_t buffer_size;
  ReadFn read_fn;
  absl::Mutex buffer_mutex;
  uint64_t buffer_start ABSL_GUARDED_BY(buffer_mutex);
  bool buffer_end_is_past_eof ABSL_GUARDED_BY(buffer_mutex);
  std::string buffer ABSL_GUARDED_BY(buffer_mutex);

  GCSFile(std::string path, bool is_cache_enable, uint64_t buffer_size,

  std::unique_ptr<ExpiringLRUCache<GcsFileStat>> stat_cache;
  GCSFile(google::cloud::storage::Client&& gcs_client);
  // This constructor is used for testing purpose only.
  GCSFile(google::cloud::storage::Client&& gcs_client, bool compose,
          uint64_t block_size, size_t max_bytes, uint64_t max_staleness,
          uint64_t stat_cache_max_age, size_t stat_cache_max_entries);
} GCSFile;

  ASSERT_EQ(read, -1) << "Read: " << read;
  ASSERT_EQ(TF_GetCode(status_), TF_NOT_FOUND) << TF_Message(status_);
  TF_SetStatus(status_, TF_OK, "");

  auto gcs_file =
      static_cast<tf_gcs_filesystem::GCSFile*>(filesystem_->plugin_filesystem);
  ASSERT_TRUE(WriteToServer(filepath, 0, content_view.length(),
                            &gcs_file->gcs_client, status_));