JustMock 单元测试在它应该失败的时候通过了

Question

我正在使用 JustMock 编写一些单元测试，并且对自己感到非常高兴，因为它们都通过了，直到我试图让一个失败。本单元测试通过：

[TestFixture]
public class TestEventAggregation
{
    class BaseEventArgs : EventArgs {}
    class DerivedEventArgs : BaseEventArgs {}

    class EventAggregationService
    {
        private Subject<object> _subject = new Subject<object>();

        public IDisposable Subscribe<TEventArgs>(EventHandler<TEventArgs> eventHandler)
            where TEventArgs : EventArgs
        {
            return _subject.OfType<EventPattern<TEventArgs>>().Subscribe(
                delegate(EventPattern<TEventArgs> pattern)
                {
                    eventHandler(pattern.Sender, pattern.EventArgs);
                }
            );
        }

        public void Publish<TEventArgs>(object sender, TEventArgs eventArgs)
            where TEventArgs : EventArgs
        {
            _subject.OnNext(new EventPattern<TEventArgs>(sender, eventArgs));
        }
    }

    [Test]
    public void BaseEventIsPublishedToBaseEventSubcriberButNotDerivedEventSubscriber()
    {
        EventAggregationService eventAggregationService = new EventAggregationService();

        // Arrange
        Action<object, BaseEventArgs> baseEventHandler = Mock.Create<Action<object, BaseEventArgs>>();
        Mock.Arrange(() => baseEventHandler(Arg.AnyObject, Arg.IsAny<BaseEventArgs>())).OccursOnce();
        Action<object, DerivedEventArgs> derivedEventHandler = Mock.Create<Action<object, DerivedEventArgs>>();
        Mock.Arrange(() => derivedEventHandler(Arg.AnyObject, Arg.IsAny<DerivedEventArgs>())).OccursOnce();

        // Act
        using (eventAggregationService.Subscribe(new EventHandler<BaseEventArgs>((s, e) => baseEventHandler(s, e))))
        using (eventAggregationService.Subscribe(new EventHandler<DerivedEventArgs>((s, e) => derivedEventHandler(s, e))))
        {
            eventAggregationService.Publish(this, new BaseEventArgs());
        }

        // Assert
        Mock.Assert(baseEventHandler);
        Mock.Assert(derivedEventHandler);
    }
}

它应该会失败，我在每个 lambda 表达式中放置了一个断点，并且调用了基而不是派生。我已经尝试过移动和扭曲东西，但我终其一生都无法弄清楚为什么这个测试会通过，因为派生的处理程序被确认不会被调用。

要自己构建它，请添加对 nunit、JustMock 和 Rx-Linq NuGet 包的引用。

Answer 1

啊，你发现了一个错误。我刚刚将修复推送到 master。修复将在下一个内部版本中发布。

作为解决方法，您可以显式断言对事件处理程序的调用：

Mock.Assert(() => baseEventHandler(null, null), Args.Ignore(), Occurs.Once());
Mock.Assert(() => derivedEventHandler(null, null), Args.Ignore(), Occurs.Never());

JustMock 单元测试在它应该失败的时候通过了

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