构建MVC2 AsyncControllers的单元测试

Question

我正在考虑重新编写一些我的MVC控制器作为异步控制器.我有这些控制器的工作单元测试,但我试图了解如何在异步控制器环境中维护它们.

例如,目前我有这样的动作:

public ContentResult Transaction()
{
    do stuff...
    return Content("result");
}

我的单元测试基本上看起来像:

var result = controller.Transaction();
Assert.AreEqual("result", result.Content);

好的,这很容易.

但是,当您的控制器更改为如下所示:

public void TransactionAsync()
{
    do stuff...
    AsyncManager.Parameters["result"] = "result";
}

public ContentResult TransactionCompleted(string result)
{
    return Content(result);
}

您如何构建单元测试？您当然可以在测试方法中调用异步启动器方法,但是如何获得返回值？

我在Google上没有看到任何相关内容......

谢谢你的任何想法.

Answer 1

与任何异步代码一样,单元测试需要了解线程信令..NET包含一个名为AutoResetEvent的类型,它可以阻止测试线程,直到异步操作完成:

public class MyAsyncController : Controller
{
  public void TransactionAsync()
  {
    AsyncManager.Parameters["result"] = "result";
  }

  public ContentResult TransactionCompleted(string result)
  {
    return Content(result);
  }
}

[TestFixture]
public class MyAsyncControllerTests
{
  #region Fields
  private AutoResetEvent trigger;
  private MyAsyncController controller;
  #endregion

  #region Tests
  [Test]
  public void TestTransactionAsync()
  {
    controller = new MyAsyncController();
    trigger = new AutoResetEvent(false);

    // When the async manager has finished processing an async operation, trigger our AutoResetEvent to proceed.
    controller.AsyncManager.Finished += (sender, ev) => trigger.Set();

    controller.TransactionAsync();
    trigger.WaitOne()

    // Continue with asserts
  }
  #endregion
}

希望有帮助:)