How to use testCALayer method of CancellingWKWebViewNavigationDelegate class

...815      viewDidDisappearExpectation,816    ], timeout: 1.0, enforceOrder: true)817    #endif818  }819  func testCALayer() {820    #if os(iOS)821    let layer = CALayer()822    layer.frame = CGRect(x: 0, y: 0, width: 100, height: 100)823    layer.backgroundColor = UIColor.red.cgColor824    layer.borderWidth = 4.0825    layer.borderColor = UIColor.black.cgColor826    assertSnapshot(matching: layer, as: .image)827    #endif828  }829  func testCALayerWithGradient() {830    #if os(iOS)831    let baseLayer = CALayer()832    baseLayer.frame = CGRect(x: 0, y: 0, width: 100, height: 100)833    let gradientLayer = CAGradientLayer()834    gradientLayer.colors = [UIColor.red.cgColor, UIColor.yellow.cgColor]835    gradientLayer.frame = baseLayer.frame836    baseLayer.addSublayer(gradientLayer)837    assertSnapshot(matching: baseLayer, as: .image)838    #endif839  }840  func testViewControllerHierarchy() {841    #if os(iOS)842    let page = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal)843    page.setViewControllers([UIViewController()], direction: .forward, animated: false)...

...499            timeout: 1,500            enforceOrder: true501        )502    }503    func testCALayer() {504        let layer = CALayer()505        layer.frame = CGRect(x: 0, y: 0, width: 100, height: 100)506        layer.backgroundColor = UIColor.red.cgColor507        layer.borderWidth = 4.0508        layer.borderColor = UIColor.black.cgColor509        assertSnapshot(matching: layer, as: .image)510    }511    func testCALayerWithGradient() {512        let baseLayer = CALayer()513        baseLayer.frame = CGRect(x: 0, y: 0, width: 100, height: 100)514        let gradientLayer = CAGradientLayer()515        gradientLayer.colors = [UIColor.red.cgColor, UIColor.yellow.cgColor]516        gradientLayer.frame = baseLayer.frame517        baseLayer.addSublayer(gradientLayer)518        assertSnapshot(matching: baseLayer, as: .image(subpixelThreshold: 1))519    }520    func testViewControllerHierarchy() {521        let page = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal)522        page.setViewControllers([UIViewController()], direction: .forward, animated: false)523        let tab = UITabBarController()524        tab.viewControllers = [525            UINavigationController(rootViewController: page),...

1import UIKit2import WebKit3class ViewController: UIViewController, WKNavigationDelegate {4    override func viewDidLoad() {5        super.viewDidLoad()6    }7    @IBAction func buttonAction(_ sender: Any) {8        let delegate = CancellingWKWebViewNavigationDelegate()9        delegate.testCALayer(webView: webView)10    }11}12import UIKit13import WebKit14class CancellingWKWebViewNavigationDelegate: NSObject, WKNavigationDelegate {15    func testCALayer(webView: WKWebView) {16        let layer = CALayer()17        layer.frame = CGRect(x: 0, y: 0, width: 100, height: 100)18        webView.layer.addSublayer(layer)19    }20}

1import UIKit2class ViewController: UIViewController, CancellingWKWebViewNavigationDelegate {3    override func viewDidLoad() {4        super.viewDidLoad()5        webView = WKWebView(frame: view.bounds)6        webViewNavigationDelegate = CancellingWKWebViewNavigationDelegate()7        view.addSubview(webView)8        testCALayer()9    }10    func testCALayer() {11        webView.load(URLRequest(url: url))12    }13}14import UIKit15import WebKit16class CancellingWKWebViewNavigationDelegate: NSObject, WKNavigationDelegate {17    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {18        decisionHandler(.allow)19    }20    func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {21        print("didStartProvisionalNavigation")22    }23    func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {24        print("didCommit")25    }26    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {27        print("didFinish")28    }29}30import UIKit31import WebKit32class ViewController: UIViewController {33    override func viewDidLoad() {34        super.viewDidLoad()35        webView = WKWebView(frame: view.bounds)36        view.addSubview(webView)37        testCALayer()38    }39    func testCALayer() {40        webView.load(URLRequest(url: url))41    }42}43import UIKit44import WebKit45class ViewController: UIViewController {46    override func viewDidLoad() {47        super.viewDidLoad()48        webView = WKWebView(frame: view.bounds)49        view.addSubview(webView)50        testCALayer()51    }52    func testCALayer() {53        let url = URL(string