如何模拟EKEventStore

Question

I have a simple function for requesting access for adding events in the Calendar.

typealias BoolCallback = (Bool) -> ()

class SimpleCalendar {

    let store: EKEventStore

    init(store: EKEventStore = EKEventStore()) {
        self.store = store
    }

    /// Request access to EventKit API for Calendar intergration
    ///
    /// - Parameter callback: returns if access was recived or denied
    func requestAccess(callback: @escaping BoolCallback) {

        let status = EKEventStore.authorizationStatus(for: .event)

        switch status {
        case .authorized:
            callback(true)
            //        case .notDetermined: //should ask for access
        //        case .denied, .restricted: //should open a ask permission view
        default:
            store.requestAccess(to: .event) { accessGranted, _ in

                DispatchQueue.main.async {
                    callback(accessGranted)
                }
            }
        }


    }
}

Is there a way to mock EKEventStore for getting the status?

I also have a simple function that checks if a calendar exists.

func doesCalendarExist(name: String) -> Bool {
    let calendars = store.calendars(for: .event)

    if calendars.contains(where: { $0.title == name }) {
        return true
    }

    return false
}

Is there a way to mock the store objects for getting store.calendars

Thanks

---

I switched

let status = EKEventStore.authorizationStatus(for: .event)

to

let status = type(of: store).authorizationStatus(for: .event)

Answer 1

I think you can use DI here. Instead of put responsibility of creating store var inside of SimpleCalendar you can create constructor for it with parameter store: EKEventStore and pass it there:

init(store: EKEventStore = EKEventStore()) {/*code*/}

This way, you can pass your own mock object.

What is the issue with overriding class method? I can't check it right now, but suppose it's possible.

Any way, other option is for mocking you can create protocol with all the methods you're using - EventStoreProtocol . These methods must be in EKEventStore I think, so you can easily adopt it using extension:

extension EKEventStore: EventStoreProtocol {}

Then instead of passing EKEventStore to constructor, pass there EventStoreProtocol .

Your mock object will be not subclass, but just class confirming to that protocol, implementing all required methods

For class method, instead of EKEventStore.authorizationStatus use type(of: store).authorizationStatus

The only thing I can think of regarding your problem is the next:

extension EKEventStore {
   func eventAuthorizationStatus() -> EKAuthorizationStatus {
      return EKEventStore.authorizationStatus(for: .event)
   }
}

Then override this method in subclass. Because EKEventStore is NSObject , it should work (but I'm not sure). This way instead of using type(of: store).authorizationStatus you can call this method.

But the question - do you really need this? Can't you just left it as is? If no, check this approach and tell me, if it works