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func application(_ application: UIApplication, 
                 didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
    let isUnitTesting = ProcessInfo.processInfo.environment["IS_UNIT_TESTING"] == "1"
    if isUnitTesting == false {
        // Do UI-related setup, which can be skipped when testing
    }
    return true
}

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class FileOpener {
    let urlOpener: URLOpening
    init(urlOpener: URLOpening = UIApplication.shared) {
        self.urlOpener = urlOpener
    }
    
    func open(identifier: String) {
        guard let url = URL(string: "iosappscheme://open?id=\(identifier)") else {
            debugPrint("Failed to load URL")
            return

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protocol URLOpening {
    func canOpenURL(_ url: URL) -> Bool
    func open(_ url: URL, 
              options: [UIApplication.OpenExternalURLOptionsKey : Any], 
              completionHandler completion: ((Bool) -> Void)?)
}

extension UIApplication: URLOpening {}

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class FileOpener {
    let application: UIApplication
    init(application: UIApplication = UIApplication.shared) {
        self.application = application
    }
    
    func open(identifier: String) {
        guard let url = URL(string: "iosappscheme://open?id=\(identifier)") else {
            debugPrint("Failed to load URL")
            return

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class FileOpener {
    func open(identifier: String) {
        guard let url = URL(string: "iosappscheme://open?id=\(identifier)") else {
            debugPrint("Failed to convert URL")
            return
        }
        if UIApplication.shared.canOpenURL(url) {
            UIApplication.shared.open(url, options: [:], completionHandler: nil)
        } else {
            debugPrint("Failed to open URL")

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class FetchRestaurantInventoryOperation: Operation {
    var restaurantData: RestaurantData
    var networkProvider: NetworkProvider
    
    // 1
    private var _executing = false {
        willSet {
            willChangeValue(forKey: "isExecuting")
        }
        didSet {

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/* I put the first DispatchQueue method intentionally to indicate that we're on
   the background queue. Just to support the explanation for beginner developers
This is not necessary in real-life, URLSession is thread-safe. Whenever you call URLSession
   it'll start executing on background. */
DispatchQueue.global().async {
    let url = URL(string: "https://theswiftpost.co/")
    if let url = url {
        DispatchQueue.main.sync {
            showLoadingIndicator() // UI Operation; has to run on the main queue
        }

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let url = URL(string: "https://theswiftpost.co/")
if let url = url {
    showLoadingIndicator() // UI Operation; has to run on the main queue
    let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
        if error != nil {
            showErrorAlert(error) // UI operation; has to run on the main queue!!
        } else if let data = data {
            debugPrint(usableData) //JSONSerialization
        }
        debugPrint(“Completed”)

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// Adding a view controller to another
let childViewController = UIViewController()
let parentViewController = UIViewController()
parentViewController.addChild(childViewController)
parentViewController.view.addSubview(childViewController.view)
// setup auto-layout constraints for childViewController.view
childViewController.didMove(toParent: parentViewController)
 
// Removing the child view controller from parent
childViewController.willMove(toParent: nil)

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import UIKit

protocol ViewCustomized {
    func createView<T>(_ viewClass: T.Type, parentView: UIView) -> T where T: UIView, T: ViewRenderable
}

protocol ViewRenderable {
    func render()
}