t-unit

func fetchPlaces(action: Action, context: MiddlewareContext<AppState>) -> Action? {

    // create places service
    // perform network request
    // dispatch set places action on success
}

t-unit

func create(Dependency) -> Middleware

t-unit

func fetchPlaces(service: PlacesServing) -> SimpleMiddleware<AppState> {

    return { (action, context) in
        guard
            let placesAction = action as? PlacesAction,
            case .fetch = placesAction
        else {
            return action
        }

t-unit

let placesService = PlacesService(
    locale: .current,
    apiKey: "<key here>",
    fetcher: NetworkFetcher(session: .shared, decoder: JSONDecoder())
)

let appStore = AppStore(
    reducer: appReducer,
    state: nil,
    middleware: [

t-unit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    private let placesService: PlacesServing
    private let appStore: AppStore

    override init() {

t-unit

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    let viewController = window?.rootViewController as! ViewController
    viewController.store = appStore

    return true
}

t-unit

// Loadable.swift
enum Loadable<T> {
    case initial
    case loading
    case value(T)
    case error(Error)
}

// AppState.swift
struct AppState: StateType {

t-unit

final class LocationEmitter: NSObject {
    
    private let locationManager: CLLocationManager
    private let store: AppStore
    
    init(locationManager: CLLocationManager, store: AppStore) {
        […]
        locationManager.delegate = self
        […]
    }

t-unit

class AppDelegate: UIResponder, UIApplicationDelegate {

    […]
    private let locationEmitter: LocationEmitter

    override init() {

        […]
        locationEmitter = LocationEmitter(locationManager: CLLocationManager(), store: appStore)
        […]

t-unit

extension ViewController: StoreSubscriber {

    typealias StoreSubscriberStateType = AppState

    func newState(state: AppState) {
      […]
        authorizationNotDeterminedView.isHidden = state.authorizationStatus != .notDetermined
        authorizationDeniedView.isHidden = (state.authorizationStatus == .authorizedAlways) || (state.authorizationStatus == .authorizedWhenInUse)
    }
}