如何在单元测试中支持运行时设置ThrowUnobservedTaskExceptions (Visual Studio)

如何在单元测试中激活运行时设置ThrowUnobservedTaskExceptions (Visual Studio 2012单元测试环境)?

我尝试在单元测试项目中添加一个App.config文件:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <runtime>
    <ThrowUnobservedTaskExceptions enabled="true"/>
  </runtime>
</configuration>

不幸的是，这不起作用。下面的单元测试应该失败，因为任务会抛出一个未处理的异常。我怎样才能做到这一点呢?

[TestMethod]
public void TestMethod()
{
    Task.Factory.StartNew(() =>
    {
        throw new InvalidOperationException("Test");
    });
    // Sleep is necessary so that the task can finish.
    Thread.Sleep(100);
    // GC.Collect is necessary so that the finalizer of the 
    // Task is called which throws the exception.
    GC.Collect();
}

上面的单元测试只是一个简化的示例，以重现我所遇到的问题。这些未处理的异常可能在外部库中调用，并且无法自己处理异常。

[TestInitialize]
public void SetThrowUnobservedTaskExceptions()
{
    Type taskExceptionHolder = typeof(Task).Assembly
        .GetType("System.Threading.Tasks.TaskExceptionHolder", false);
    if (taskExceptionHolder != null)
    {
        var field = taskExceptionHolder.GetField("s_failFastOnUnobservedException",
            BindingFlags.Static | BindingFlags.NonPublic);
        field.SetValue(null, true);
    }
}