Swift XCUITest:如何在执行UI测试时单击UIImagePickerController()的默认"Choose“按钮？

import XCTest

class MyUITests: XCTestCase {
    var app: XCUIApplication!

    override func setUp() {
        super.setUp()
        app = XCUIApplication()
        app.launch()
    }

    func testChooseButton() {
        // 创建UIImagePickerController实例并设置为根视图控制器或当前视图控制器的presentedViewController
        let imagePickerController = UIImagePickerController()
        app.keyWindow?.rootViewController?.present(imagePickerController, animated: true, completion: nil)

        // 获取"Choose"按钮的元素
        let chooseButton = app.buttons["Choose"]

        // 单击"Choose"按钮
        chooseButton.tap()

        // 在这里可以添加验证代码，验证应用程序在点击"Choose"按钮后的行为
    }
}