Arrlindii

struct PromotionViewControllerStyle {
    let contentView: String
}

Arrlindii

class EBookPromotionSplitTest: SplitTestProtocol {
    typealias ValueType = PromotionViewControllerStyle
    static var identifier: String = "ebookPromotionTest"
    var value: PromotionViewControllerStyle
    
    
    required init(group: String) {
        self.value =
            group == "social" ?
                PromotionViewControllerStyle.init(contentView: "\(TwitterView.self)")

Arrlindii

class SplitTestingManager {
    static func getSplitValue<Value: SplitTestProtocol>(for split: Value.Type) -> Value.ValueType {
        let group = UserDefaults.standard.value(forKey: split.self.identifier) as! String
        return Value(group: group).value
    }
}

Arrlindii

protocol SplitTestProtocol {
    associatedtype ValueType: Any
    static var identifier: String {get}
    var value: ValueType {get}
    init(group: String)
}

Arrlindii

protocol ICouponManager {
    func getAtiveCoupon() -> Coupon?
}

class CouponManager: ICouponManager {
    //Same Implementation as from above
}

class MockCouponManager: ICouponManager {
    func getAtiveCoupon() -> Coupon? {

Arrlindii

PaymentManager(couponManager: MockCouponManager())
PaymentManager(couponManager: CouponManager())

Arrlindii

init(paymentManager: PaymentManager) {
    self.paymentManager = paymentManager
    super.init(nibName: nil, bundle: nil)
}

override func viewDidLoad() {
    super.viewDidLoad()
    paymentManager.loadProductPrice(completion: configureWithPrice)
}

Arrlindii

class CouponManager {
    func logEvent(_ event: Event) {
        //Code for saving the ocurrign event
    }
    
    func deleteUsedCoupon(_ coupon: Coupon) {
        //Code that erases the coupon after user has redemed it
    }
    
    func getAtiveCoupon() -> Coupon? {

Arrlindii

class PaymentManager {
    private let dataLoader: PaymentDataLoader
    private let priceManager: PriceCalculator
    private let couponManager: CouponManager
    
    init(dataLoader: PaymentDataLoader, priceManager: PriceCalculator, couponManager: CouponManager) {
        self.dataLoader = dataLoader
        self.priceManager = priceManager
        self.couponManager = couponManager
    }

Arrlindii

    /*
        We offer discount if user cancelled the payment half-way through,
        and if user canceled our payment screen multiple times
     */
    func getPriceDiscountPercentage() -> Double {
        if UserDefaults.standard.bool(forKey: "kPaymentCancelledHalfWay") {
            return 0.5
        }
        let timesScreenOpened = UserDefaults.standard.integer(forKey: "knumberOfTimesPaymentScreenOpened")
        if timesScreenOpened > 3 {