您如何对内部使用计时器的类进行单元测试? [英] How do you unit test classes that use timers internally?

问题描述

不管喜欢与否，有时您必须为内部使用计时器的类编写测试.

Like it or not, occasionally you have have to write tests for classes that make internal use of timers.

例如，一个类接收系统可用性报告并在系统停机时间过长时引发事件

Say for example a class that takes reports of system availability and raises an event if the system has been down for too long

public class SystemAvailabilityMonitor {
    public event Action SystemBecameUnavailable = delegate { };
    public event Action SystemBecameAvailable = delegate { };
    public void SystemUnavailable() {
        //..
    }
    public void SystemAvailable() {
        //..
    }
    public SystemAvailabilityMonitor(TimeSpan bufferBeforeRaisingEvent) {
        //..
    }
}

我有一些我使用的技巧(将发布这些作为答案)但我想知道其他人是怎么做的，因为我对我的任何一种方法都不完全满意.

I have a couple tricks which I use (will post these as an answer) but I wonder what other people do since I'm not fully satisfied with either of my approaches.

推荐答案

我从对警报做出反应的对象中提取计时器.例如，在 Java 中，您可以将它传递给 ScheduledExecutorService.在单元测试中，我传递了一个我可以确定性控制的实现，例如 jMock 的 DeterministicScheduler.

I extract the timer from the object that reacts to the alarm. In Java you can pass it a ScheduledExecutorService, for example. In unit tests I pass it an implementation that I can control deterministically, such as jMock's DeterministicScheduler.

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