ios - 如何测试 UIAlertController

Question

我正在测试一个呈现 UIAlertController 的函数，但测试一直失败。这是函数的样子:

func presentBuyingErrorDialogue() {
  let alert = UIAlertController(
    title: "Warning",
    message: "Error purchasing item, please retry this action. If that doesn't help, try restarting or reinstalling the app.",
    preferredStyle: .alert
  )
  let okButton = UIAlertAction(title: "OK", style: .default)
  alert.addAction(okButton)
  self.present(alert, animated: true, completion: nil)
}

因为这个函数在一个名为 ShopViewController 的类中，我假设测试它的正确方法是调用函数 shopViewController.presentBuyingErrorDiaologue() 然后使用 XCTAssertTrue(shopViewController .presentedViewController 是 UIAlertController)。但是，当我运行测试时断言语句失败。测试 UIAlertController 是呈现 View 的正确方法是什么？

Answer 1

在测试其可见性之前，您应该等待 UIAlertController 完全呈现，因此您可以尝试按照以下方式更改您的测试:

import XCTest

class UIAlertControllerTests: XCTestCase {

    func presentBuyingErrorDialogue() {
      let alert = UIAlertController(title: "Warning", message: "Error purchasing item, please retry this action. If that doesn't help, try restarting or reinstalling the app.", preferredStyle: .alert)
      let okButton = UIAlertAction(title: "OK", style: .default)
      alert.addAction(okButton)
      UIApplication.shared.keyWindow?.rootViewController?.present(alert, animated: true, completion: nil)
    }

    func testPresentBuyingErrorDialogue() {
      self.presentBuyingErrorDialogue()
      let expectation = XCTestExpectation(description: "testExample")
      DispatchQueue.main.asyncAfter(deadline: .now() + 1.0, execute: {
        XCTAssertTrue(UIApplication.shared.keyWindow?.rootViewController?.presentedViewController is UIAlertController)
        expectation.fulfill()
      })
      wait(for: [expectation], timeout: 1.5)
   }
}

您可以将 UIApplication.shared.keyWindow?.rootViewController 更改为您的 ShopViewController。