Xamarin UI test giving the error: Query for Marked("Click Me!") gave 0 results

Question

我正在为示例 Xamarin 应用程序实现页面对象模式框架，当我尝试运行一个简单的测试来验证按钮点击时，我收到以下错误：查询标记（"Click Me!"）给出了 0 个结果。

我在没有设置框架的情况下尝试了运行测试，结果运行很好，但是在设置框架之后它给了我错误。

这是我的页面对象文件

namespace SampleUITests.Pages
{
    using Query = System.Func<Xamarin.UITest.Queries.AppQuery, Xamarin.UITest.Queries.AppQuery>;
    public class WelcomePage : BasePage
    {
        readonly Query ClickButton;
        readonly Query Label;
        protected override PlatformQuery Trait => new PlatformQuery
        {
            Android = x => x.Marked("Click Me!")
            //Can add iOS trait as well 
        };
        public WelcomePage()
        {
            if (OnAndroid)
            {
                Label = x => x.Marked("Welcome To Xamarin.Forms!");
                ClickButton = x => x.Marked("Click Me!");
            }

            if (OniOS)
            {
                //add iOS identifiers here
            }

        }
        public void OnClick()
        {
            app.Repl();
            app.WaitForElement(ClickButton);
            app.Tap(ClickButton);
            Assert.Equals("You clicked 1 times.", app.Query(ClickButton).First().Text);
        }

    }
}

这是我的代码，我在其中调用 Page 对象的对象和运行测试。

namespace SampleUITests
{
    [TestFixture(Platform.Android)]
    [TestFixture(Platform.iOS)]
    public class Tests : BaseTestFixture
    {

        public Tests(Platform platform) : base(platform)
        {
            //this.platform = platform;
        }

        [Test]
        public void VerifyButtonClick()
        {
            WelcomePage welcomepage = new WelcomePage();
            welcomepage.OnClick();
        }

    }
}

我希望通过验证按钮点击和按钮上的文本（您点击了 1 次。）的测试，但我收到以下错误：

Android test running Xamarin.UITest version: 3.0.3 
Initializing Android app on device emulator-5554 with apk: C:\Users\Sayali.Sheode\AppData\Local\Xamarin\Mono for Android\Archives19-08-16\FirstXamarinApp.Android 8-16-19 9.17 AM.apkarchive\com.companyname.firstxamarinapp.apk 
Skipping local screenshots. Can be enabled with EnableScreenshots() when configuring app. 
Signing apk with Xamarin keystore. 
Skipping installation: Already installed. 
Waiting for element matching Marked("Click Me!"). 
Waiting for element matching Marked("Click Me!").  Using element matching Marked("Click Me!"). Tapping coordinates [ 540, 1731 ]. 
Query for Marked("Click Me!") gave 0 results.

这也是堆栈跟踪：

Message: 
        System.InvalidOperationException : Sequence contains no elements
      Stack Trace: 
        at Enumerable.First[TSource](IEnumerable`1 source)
        at WelcomePage.OnClick() in WelcomePage.cs line: 43
        at Tests.VerifyButtonClick() in Tests.cs line: 36

Answer 1

经过进一步的调试和研究，我发现 ClickButton = x => x.Marked("Click Me!"); 应该通过 ID 而不是按钮上的文本来识别，因为单击时按钮上的文本会发生变化。将标识符更改为以下内容并通过测试：

ClickButton = x => x.Id("NoResourceEntry-3");

Xamarin UI test giving the error: Query for Marked("Click Me!") gave 0 results

Xamarin UI test giving the error: Query for Marked("Click Me!") gave 0 results

c#

xamarin

xamarin.forms

xamarin.android

xamarin.uitest