After restructuring for writing test cases for NSNotification centre logic

UnitTesting.playground

class CurrentLocationProvider {
    static let authChangedNotification = Notification.Name("AuthChanged")
    
    let notificationCenter: NotificationCenter
    init(notificationCenter: NotificationCenter = .default) {
        self.notificationCenter = notificationCenter
    }
    func notifyAuthChanged() {
        let name = CurrentLocationProvider.authChangedNotification
        notificationCenter.post(name: name, object: self)
    }
}
class PointsOfInterestTableViewController {
    let notificationCenter: NotificationCenter
    var observer: AnyObject?
    init(notificationCenter: NotificationCenter = .default) {
        self.notificationCenter = notificationCenter
        let name = CurrentLocationProvider.authChangedNotification
        observer = notificationCenter.addObserver(forName: name, object: nil, queue: .main) { [weak self] _ in
            self?.handleAuthChanged()
        }
    }
    var didHandleNotification = false
    func handleAuthChanged() {
        didHandleNotification = true
    }
}