How to test for view disappear in navigation controller

final class PopTests: XCTestCase {
    func testPop() {
        let window = UIWindow(frame: UIScreen.main.bounds)
        let navigationController = UINavigationController()
        window.rootViewController = navigationController
        let viewController = DetailViewController()

        navigationController.viewControllers = [
            UIViewController(),
            viewController
        ]

        window.makeKeyAndVisible()
        let expectation = XCTestExpectation()
        navigationController.popViewController(animated: false)
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
            XCTAssertTrue(viewController.wasDismissed)
            expectation.fulfill()
        }
        wait(for: [expectation], timeout: 1)
    }
}

class DetailViewController: UIViewController {
        override func viewWillDisappear(_ animated: Bool) {
            super.viewWillDisappear(animated)
            if isMovingFromParent {
                wasDismissed = true
            }
        }
}