有没有办法在 UITest 中将 valueForKey 与 NSPredicate 一起使用？

Question

我的 iOS UI 测试有以下测试辅助函数：

func waitForElementToHaveKeyboardFocus(element: XCUIElement) {
    self.expectationForPredicate(NSPredicate(format:"valueForKey(\"hasKeyboardFocus\") == true"), evaluatedWithObject:element, handler: nil)
    self.waitForExpectationsWithTimeout(5, handler: nil)
}

在我的测试中我有：

let usernameTextField = app.textFields["Username"]
let passwordTextField = app.secureTextFields["Password"]
waitForElementToHaveKeyboardFocus(usernameTextField)

测试失败并出现以下错误：

error: -[ExampleAppUITests.ExampleAppUITests testExampleApp] : failed: caught "NSUnknownKeyException", "[<_NSPredicateUtilities 0x10e554ee8> valueForUndefinedKey:]: this class is not key value coding-compliant for the key hasKeyboardFocus."

如果我在失败时在测试中放置一个断点并在聚焦和未聚焦的字段上手动调用 valueForKey("hasKeyboardFocus")，我似乎得到了正确的行为：

(lldb) po usernameTextField.valueForKey("hasKeyboardFocus")
    t =    51.99s     Find the "Username" TextField
    t =    51.99s         Use cached accessibility hierarchy for ExampleApp
    t =    52.00s         Find: Descendants matching type TextField
    t =    52.01s         Find: Elements matching predicate '"Username" IN identifiers'
▿ Optional<AnyObject>
  - Some : 1

(lldb) po passwordTextField.valueForKey("hasKeyboardFocus")
    t =   569.99s     Find the "Password" SecureTextField
    t =   569.99s         Use cached accessibility hierarchy for ExampleApp
    t =   570.01s         Find: Descendants matching type SecureTextField
    t =   570.01s         Find: Elements matching predicate '"Password" IN identifiers'
▿ Optional<AnyObject>
  - Some : 0

是否可以让 valueForKey 在 XCUIElement 上与 NSPredicate 在 UI 测试中一起工作？还有其他优雅的方法吗？

Answer 1

您可以这样做，将 valueForKey("") 的语句作为方法的闭包传递：

func waitForElementToHaveKeyboardFocus(statement statement: () -> Bool, timeoutSeconds: Int)
{
    var second = 0
    while statement() != true {
        if second >= timeoutSeconds {
            XCTFail("statement reached timeout of \(timeoutSeconds) seconds")
        }

        sleep(1)
        second = second + 1
    }
}

然后在测试中使用：

waitForElementToHaveKeyboardFocus(statement: { usernameTextField.valueForKey("hasKeyboardFocus") as? Bool == true }, timeoutSeconds: 10)

您可以将此方法重命名为更通用的名称，它将验证您传递给它的任何闭包。希望这对您有所帮助！

Answer 2

看来你的谓词有点不对劲。尝试将其更改为以下内容：

NSPredicate(format: "hasKeyboardFocus == true"), evaluatedWithObject:element, handler: nil)

创建谓词时不需要传入valueForKey部分。

有没有办法在 UITest 中将 valueForKey 与 NSPredicate 一起使用？

Is there a way to use valueForKey with NSPredicate in UITest?

ios

xcode-ui-testing

uitest