XCUIElement tap()不起作用

问题描述

我有一个非常简单的XCTestCase实现，该实现测试按钮上的轻击并期望出现Alert控制器.问题是tap()方法不起作用.在相关按钮的IBAction中放置一个断点，我意识到逻辑甚至没有被调用.

I have a very simple XCTestCase implementation that tests a tap on a button and expects an Alert controller to show up. The problem is that the tap() method doesn't work. Placing a breakpoint in the associated button's IBAction I realise the logic doesn't even get called.

class uitestsampleUITests: XCTestCase {

    var app: XCUIApplication!

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

    func testButton() {
        let button = app.buttons["Button"]
        button.tap()

        expectationForPredicate(NSPredicate(format: "exists == 1"), evaluatedWithObject: button, handler: nil)
        waitForExpectationsWithTimeout(5.0, handler: nil)
    }
}

此外，复制button.tap()指令会使测试通过，如下所示:

Also, duplicating the button.tap() instruction makes the test pass, like this:

    func testButton() {
        let button = app.buttons["Button"]
        button.tap()
        button.tap()

        expectationForPredicate(NSPredicate(format: "exists == 1"), evaluatedWithObject: button, handler: nil)
        waitForExpectationsWithTimeout(5.0, handler: nil)    
    }

我在Xcode 7.3.1中面临此问题，我缺少什么吗?是虫子吗?

I am facing this issue in Xcode 7.3.1 Am I missing something? Is it a bug?

推荐答案

因此，Apple工程师对我的错误报告做出了回应:

So an Apple engineer responded to my bug report saying:

要尝试解决该问题，请考虑在以下位置稍加延迟 测试的开始(sleep(1)就足够了.)

To try to work around that issue, consider placing a small delay at the beginning of your test (sleep(1) should be enough).

所以我做到了，现在可以了:

So I did it and now it works:

override func setUp() {
    super.setUp()
    continueAfterFailure = false
    app = XCUIApplication()
    app.launch()
    sleep(1)
}

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