Question

public class UnitTest1
{
    // you cant use a brush because it is UI
    // you switch to a UI test and it fails because it is async
    // bottom line you cant test an async routine that uses a brush,
    // even though your really are not doing ANY UI stuff - how stupid is that?

    [TestMethod]
    //[Microsoft.VisualStudio.TestPlatform.UnitTestFramework.AppContainer.UITestMethod]
    async public Task TestMethod1()
    {
        var t = new ObservableCollection<CommentEvent>();
        t.Add(new CommentEvent(Colors.LightPink) { Label = "Bad", 
              EventTime = TimeCode.FromTicks(DateTime.Now.Ticks,
              TimeCode.SmpteFrameRate.Smpte2997Drop) });
        t.Add(new CommentEvent(Colors.DarkSeaGreen) { Label = "Good",
               EventTime = TimeCode.FromTicks(DateTime.Now.Ticks,
               TimeCode.SmpteFrameRate.Smpte2997Drop) });
        t.Add(new CommentEvent(Colors.LightPink) { Label = "Bad",
               EventTime = TimeCode.FromTicks(DateTime.Now.Ticks,
               TimeCode.SmpteFrameRate.Smpte2997Drop) });
        t.Add(new CommentEvent(Colors.DarkSeaGreen) { Label = "Good",
               EventTime = TimeCode.FromTicks(DateTime.Now.Ticks,
               TimeCode.SmpteFrameRate.Smpte2997Drop) });

        var s = await PreludeXMP.Get(t);

        Assert.IsNotNull(s);
        System.Diagnostics.Debug.WriteLine(s);
    }
}

这会抛出一个

该应用程序调用了一个为a编组的接口不同的线程。（HRESULT的例外情况：0x8001010E （RPC_E_WRONG_THREAD））。如果您在测试中使用UI对象考虑使用[UITestMethod]属性而不是[TestMethod]来执行测试在UI线程中。

因为CommentEvent的构造函数创建了一个Solid.Brush。任何建议的工作方式？

Answer 1

在我的一个测试中尝试使用WriteableBitmap和异步方法时遇到了一个非常类似的问题。在搜索使其成功的方式时，我偶然发现了您的问题并chue x's answer提到了评论。

使用他的方法，我设法使其即使使用异步调用也能正常工作。在您的情况下，测试代码可以像这样修改：

[TestMethod]
async public Task TestMethod1()
{
    var taskSource = new TaskCompletionSource<object>();
    await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(
        CoreDispatcherPriority.Normal, async () =>
    {
        try
        {
            var t = new ObservableCollection<CommentEvent>();
            t.Add(new CommentEvent(Colors.LightPink) { Label = "Bad", 
                  EventTime = TimeCode.FromTicks(DateTime.Now.Ticks,
                  TimeCode.SmpteFrameRate.Smpte2997Drop) });
            t.Add(new CommentEvent(Colors.DarkSeaGreen) { Label = "Good",
                   EventTime = TimeCode.FromTicks(DateTime.Now.Ticks,
                   TimeCode.SmpteFrameRate.Smpte2997Drop) });
            t.Add(new CommentEvent(Colors.LightPink) { Label = "Bad",
                   EventTime = TimeCode.FromTicks(DateTime.Now.Ticks,
                   TimeCode.SmpteFrameRate.Smpte2997Drop) });
            t.Add(new CommentEvent(Colors.DarkSeaGreen) { Label = "Good",
                   EventTime = TimeCode.FromTicks(DateTime.Now.Ticks,
                   TimeCode.SmpteFrameRate.Smpte2997Drop) });

            var s = await PreludeXMP.Get(t);

            Assert.IsNotNull(s);
            System.Diagnostics.Debug.WriteLine(s);

            askSource.SetResult(null);
        }
        catch (Exception e)
        {
            taskSource.SetException(e);
        }
    }
    await taskSource.Task;
}

我已经在我刚刚发布的a blog post中用自己的例子写了一个更深入的解释。

测试：在异步方法中使用画笔

1 个答案: