code: func (c *MockClient) GetMulti(keys []string) map[string]GetResponse {
  	c.mutex.Lock()
  	defer c.mutex.Unlock()
  
  	res := make(map[string]GetResponse)
  	for _, key := range keys {
  		res[key] = c.getHelper(key)
  	}
  	return res
  }
docs: // Batch version of the Get method.