SURYAKANTSHARMA

@propertyWrapper struct Currency {
    var projectedValue: Bool

    // This is must stored property in every property wrapper
    var wrappedValue: String  {
        didSet {
            wrappedValue = "₹ " + wrappedValue
            projectedValue = wrappedValue.contains(",")
        }

SURYAKANTSHARMA

class Singleton {
    private init() { }
    static let sharedInstance: Singleton = {
        let instance = Singleton()
        // setup code
        return instance
    }()
}

SURYAKANTSHARMA

typealias CGFloat = (Float, Float)
class UIResponder {
    func handleTap(event: TapEvent) {}
}

class TapEvent {
  let location: CGFloat
  
    init(location: CGFloat) {

SURYAKANTSHARMA

class Singleton {
    private init() { }
    static let sharedInstance = Singleton()
}

SURYAKANTSHARMA

class MockURLOpener: URLOpening {
        var openedURL: URL?
        func open(_ url: URL,
                  options: [UIApplication.OpenExternalURLOptionsKey : Any],
                  completionHandler: ((Bool) -> Void)?) {
            openedURL = url
        }
    }

    func testDocumentOpener() {

SURYAKANTSHARMA

struct Document {
    let identifier: Int
}
enum Mode: String {
    case edit = "edit"
    case view = "view"
}
protocol URLOpening {
    func open(_ url: URL, options: [UIApplication.OpenExternalURLOptionsKey : Any], completionHandler completion: ((Bool) -> Void)?)
}

SURYAKANTSHARMA

struct Document {
    let identifier: Int
}
enum Mode: String {
    case edit = "edit"
    case view = "view"
}
class DocumentOpener {
    func openUrl(document: Document, mode: Mode) {
        let stringURL = "myappscheme://open?id=\(document.identifier)&mode=\(mode.rawValue)"

SURYAKANTSHARMA

func testCart() {
   let product = Product(name: "Macbook", price: 100)
   var cart = Cart()
   cart.products.append(product)
   XCTAssertEqual(product.price, cart.totalPrice)
   let coupon = Coupon(code: "SPECIAL20", percentage: 20)
   cart.apply(coupon)
   XCTAssertEqual(cart.totalPrice, 80)
}

SURYAKANTSHARMA

typealias Price = Double
struct Product {
    let name: String
    let price: Price
}

struct Coupon {
    let code: String
    let percentage: Double
}

SURYAKANTSHARMA

func testAppraisal() {
    let user = User(name: "John", salary: 100.0)
    let result = Appraisal(user: user, rating: PerformanceRating.exceedExpection).perform()
    switch result {
    case .bonus(let amount):
        XCTAssertTrue(amount == 200.0)
    default:
        XCTFail("Appraisal Perform function is faulty")
    }
}