let app = XCUIApplication()

public extension DispatchQueue {
    private static var _onceTracker = [String]()
    
    public class func once(file: String = #file, function: String = #function, line: Int = #line, block:(Void)->Void) {
        let token = file + ":" + function + ":" + String(line)
 once(token: token, block: block)

private let swizzling: (UIViewController.Type) -> () = { viewController in
    
    let originalSelector = #selector(viewController.viewWillAppear(_:))
    let swizzledSelector = #selector(viewController.proj_viewWillAppear(animated:))

extension Optional where Wrapped == String {
var isNilOrEmpty: Bool {
        return ((self as? String) ?? "").isEmpty
    }
}

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

import Foundation
struct Resource {
    enum HTML: String, ResourceConvertible, Iteratable {
        case rightOfWithdrawal = "RightOfWithdrawal"
        case privatePolicy = "PrivatePolicy"
        case termsAndConditions = "TermsAndConditions"
    }
}

protocol Iteratable {}
extension RawRepresentable where Self: RawRepresentable {
    static func iterateEnum<T: Hashable>(_: T.Type) -> AnyIterator<T> {
        var i = 0
        return AnyIterator {
            let next = withUnsafePointer(to: &i) {
                $0.withMemoryRebound(to: T.self, capacity: 1) { $0.pointee }
 }