单元测试Windows 8商店应用程序用户界面（Xaml控件）

Question

我一直在创建一个Windows应用商店应用程序，但我有线程问题测试创建一个网格（这是一个XAML控件）的方法。 我试过使用NUnit和MSTest进行测试。

的测试方法是：

[TestMethod] 
public void CreateThumbnail_EmptyLayout_ReturnsEmptyGrid() 
{ 
    Layout l = new Layout(); 
    ThumbnailCreator creator = new ThumbnailCreator(); 
    Grid grid = creator.CreateThumbnail(l, 192, 120); 

    int count = grid.Children.Count; 
    Assert.AreEqual(count, 0); 
} 

而creator.CreateThumbnail（这引发错误的方法）：

public Grid CreateThumbnail(Layout l, double totalWidth, double totalHeight) 
{ 
    Grid newGrid = new Grid(); 
    newGrid.Width = totalWidth; 
    newGrid.Height = totalHeight; 

    SolidColorBrush backGroundBrush = new SolidColorBrush(BackgroundColor); 
    newGrid.Background = backGroundBrush; 

    newGrid.Tag = l;    
    return newGrid; 
} 

当运行该测试它引发此错误：

System.Exception: The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD)) 

Answer 1

您的控件相关代码需要在UI线程上运行。试试：

[TestMethod] 
async public Task CreateThumbnail_EmptyLayout_ReturnsEmptyGrid() 
{ 
    int count = 0; 
    await ExecuteOnUIThread(() => 
    { 
     Layout l = new Layout(); 
     ThumbnailCreator creator = new ThumbnailCreator(); 
     Grid grid = creator.CreateThumbnail(l, 192, 120); 
     count = grid.Children.Count; 
    }); 

    Assert.AreEqual(count, 0); 
} 

public static IAsyncAction ExecuteOnUIThread(Windows.UI.Core.DispatchedHandler action) 
{ 
    return Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, action); 
} 

以上应该在MS Test上工作。我不知道NUnit。