C＃：如何测试一个基本的线程工人类 [英] C#: How to test a basic threaded worker class

问题描述

我正在蘸我的脚趾测试多线程的东西，但不太确定如何开始。我相信，如果我能够找到更多的东西，我会更容易看出更多的东西，所以我想知道有人可以帮助我为这个简单的课程写一个NUnit测试用例：

  class Worker 
 {
 public event EventHandler< EventArgs> Done =（s，e）=> {}; 
 
 public void StartWork（）
 {
 var thread = new Thread（Work）{Name =Worker Thread}; 
 thread.Start（）; 
} 
 
 private void Work（）
 {
 //做一些沉重的举重
 Thread.Sleep（500）; 
完成（this，EventArgs.Empty）; 
} 
} 
  

我想测试的是简单的：是完成完成后引发的事件。如果它是同步的，我不会有任何问题，但不确定哪里甚至不开始。一个简单的测试，如果它不是多线程（和工作方法不是私有的）可以是：

  [TestFixture] 
 class WorkerTests 
 {
 [Test] 
 public void DoWork_WhenDone_EventIsRaised（）
 {
 var worker = new Worker（）; 
 
 var eventWasRaised = false; 
 worker.Done + =（s，e）=> eventWasRaised = true; 
 
 worker.Work（）; 
 Assert.That（eventWasRaised）; 
} 
} 
  

任何指针？

解决方案

您需要使用ManualResetEvent - 请参阅单元测试多线程异步事件更多细节。

/ p>

  [Test] 
 public void DoWork_WhenDone_EventIsRaised（）
 {
 var worker = new Worker ）; 
 
 var eventWasRaised = false; 
 var mre = new ManualResetEvent（false）; 
 worker.Done + =（s，e）=> {eventWasRaised = true; mre.Set（）; }; 
 
 worker.Work（）; 
 mre.WaitOne（1000）; 
 Assert.That（eventWasRaised）; 
} 
  

I'm dipping my toes in how to test multi-threaded stuff, but not quite sure how to get started. I'm sure I will figure more stuff out easier if I could just get stuff going, so I was wondering if someone could help me write an NUnit test case for this simple class:

class Worker
{
    public event EventHandler<EventArgs> Done = (s, e) => { };

    public void StartWork()
    {
        var thread = new Thread(Work) { Name = "Worker Thread" };
        thread.Start();
    }

    private void Work()
    {
        // Do some heavy lifting
        Thread.Sleep(500);
        Done(this, EventArgs.Empty);
    }
}

What I would like to test is simply: Is the Done event raised when it finishes. I would have no problems if it was synchronous, but not sure where to even begin when it is not. A simple test if it wasn't multi-threaded (and the Work method wasn't private) could be:

[TestFixture]
class WorkerTests
{
    [Test]
    public void DoWork_WhenDone_EventIsRaised()
    {
        var worker = new Worker();

        var eventWasRaised = false;
        worker.Done += (s, e) => eventWasRaised = true;

        worker.Work();
        Assert.That(eventWasRaised);
    }
}

Any pointers?

解决方案

You need to use a ManualResetEvent - see Unit Testing Multi-Threaded Asynchronous Events for more details.

Something like:

[Test]
public void DoWork_WhenDone_EventIsRaised()
{
   var worker = new Worker();

   var eventWasRaised = false;
   var mre = new ManualResetEvent(false);
   worker.Done += (s, e) => { eventWasRaised= true; mre.Set(); };

   worker.Work();
   mre.WaitOne(1000);
   Assert.That(eventWasRaised);
}

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