type FeedInterface interface {
// Init inits feed (create files and directories) Init() error// Add adds new item into feed Add(author, title, description, link string, created time.Time) error// Write writes RSS feed into w Write(w io.Writer) error
}
type ServerInterface interface {
// Start starts server. It doesn't finish until server is shutdowned Start() error// Shutdown shutdowns server. It unlocks Start() Shutdown() error
}