code: func (f *FakeDocker) BuildImage(opts BuildImageOptions) error {
  	f.BuildImageOpts = opts
  	if opts.Stdin != nil {
  		_, err := io.Copy(ioutil.Discard, opts.Stdin)
  		if err != nil {
  			return err
  		}
  	}
  	return f.BuildImageError
  }
docs: // BuildImage builds image