code: func (t *InjectedTransaction) BatchGet(keys []Key) (map[string][]byte, error) {
  	t.cfg.RLock()
  	defer t.cfg.RUnlock()
  	if t.cfg.getError != nil {
  		return nil, t.cfg.getError
  	}
  	return t.Transaction.BatchGet(keys)
  }
docs: // BatchGet returns an error if cfg.getError is set.