swift - EarlGrey测试对ViewController的隔离

Question

我正在尝试测试是否成功登录后会出现一个新的viewcontroller，但我不太走运，无法理解原因。

测试：

func testLoginButtonPerformsSegueWithValidEmailAndPassword() {
    let titleLabel = EarlGrey.select(elementWithMatcher: grey_kindOfClass(MyBillsViewController.self))
    let assertion = grey_sufficientlyVisible()
    let conditionName = "Wait for title to appear in next MyBillsViewController"

    login(email: registeredEmail,
          password: password)

    let appearedSuccesfully = waitForSuccess(of: assertion,
                                             with: titleLabel,
                                             conditionName: conditionName)

    GREYAssertTrue(appearedSuccesfully, reason: "Title Label appeared with correct text")
}

登录助手方法：

func login(email: String, password: String) {
    let emailTextField = grey_accessibilityID(TestAccesID.emailTextField)
    let passwordTextField = grey_accessibilityID(TestAccesID.passwordTextField)
    let loginButton = grey_accessibilityID(TestAccesID.loginButton)

    EarlGrey.select(elementWithMatcher: emailTextField)
        .perform(grey_tap()).perform(grey_typeText(email))
    EarlGrey.select(elementWithMatcher: passwordTextField)
        .perform(grey_tap()).perform(grey_typeText(password))
    EarlGrey.select(elementWithMatcher: loginButton).perform(grey_tap())
}

GreyCondition Helper方法：

func waitForSuccess(of assertion: GREYMatcher,
                    with element: GREYElementInteraction,
                    conditionName: String ) -> Bool {
    var success = false

    GREYCondition(name: conditionName, block: { () -> Bool in

        let errorOrNil = UnsafeMutablePointer<NSError?>.allocate(capacity: 1)
        errorOrNil.initialize(to: nil)

        element.assert(with: assertion, error: errorOrNil)

        success = errorOrNil.pointee == nil
        errorOrNil.deinitialize()
        errorOrNil.deallocate(capacity: 1)

        return success
    }).wait(withTimeout: 3.0)

    return success
}

尽管成功登录并正确选择正确的视图控制器，但我仍然无法通过测试，但是我不确定自己缺少什么。任何帮助将是巨大的，谢谢。

Answer 1

异步功能测试是已知的挑战。如果您设置断点，我认为问题在于：

GREYCondition(name: conditionName, block: {
  //Do stuff here.
}).wait(withTimeout: 3.0)

该块不会立即输入，然后在 return success行（其中成功=假）之后直接进入 wait。

要解决此问题，请尝试实现 XCWaitCompletionHandler和 XCTestExpectation：

func expectation(description: String) -> XCTestExpectation

func waitForExpectations(timeout: TimeInterval, handler: XCWaitCompletionHandler? = nil)