code: func (m *Mocker) Verify(ctx context.Context, sigf string, in string) error {
  	sigb, err := ioutil.ReadFile(sigf)
  	if err != nil {
  		return err
  	}
  
  	buf, err := ioutil.ReadFile(in)
  	if err != nil {
  		return err
  	}
  	sum := sha256.New()
  	_, _ = sum.Write(buf)
  	hexsum := fmt.Sprintf("%X", sum.Sum(nil))
  
  	if string(sigb) != hexsum {
  		return fmt.Errorf("hashsum mismatch")
  	}
  
  	return nil
  }
docs: // Verify does a pseudo-verification