code: func NewFakeSource(fqdnTemplate string) (Source, error) {
  	if fqdnTemplate == "" {
  		fqdnTemplate = defaultFQDNTemplate
  	}
  
  	return &fakeSource{
  		dnsName: fqdnTemplate,
  	}, nil
  }
docs: // NewFakeSource creates a new fakeSource with the given config.