code: func NewInmemoryStore() *DBStore {
  	db, err := leveldb.Open(storage.NewMemStorage(), nil)
  	if err != nil {
  		panic(err)
  	}
  	return &DBStore{
  		db: db,
  	}
  }
docs: // NewInmemoryStore returns a new instance of DBStore. To be used only in tests and simulations.