一个WPF程序UnitTest发生错误的解决办法

[TestMethod]
public void Test()
{
Window window = new Window();
window.Show();
window.Close();
window = null;
}

以上代码会引发一个异常，异常消息如下：

"An unhandled exception of type 'System.Runtime.InteropServices.InvalidComObjectException' occurred in PresentationCore.dll Additional information: COM object that has been separated from its underlying RCW cannot be used."

解决办法： 在TestCleanup()中调用CurrentDispatcher.InvokeShutdown() 。

[TestCleanup]
public void TestCleanup()
{
System.Windows.Threading.Dispatcher.CurrentDispatcher.InvokeShutdown();
}

参考： Tricks for Writing Unit Tests for WPF Applications