在xunit测试中模拟HostingEnvironment.QueueBackgroundWorkItem

问题描述

我有一种使用的方法我希望对该调用之前的行为进行单元测试的HostingEnvironment.QueueBackgroundWorkItem，但是测试失败，并显示System.InvalidOperationException : Operation is not valid due to the current state of the object.

I have a method using HostingEnvironment.QueueBackgroundWorkItem which I wish to unit test some behaviour before this call, however, the test is failing with System.InvalidOperationException : Operation is not valid due to the current state of the object.

我怀疑这需要模拟HostingEnvironment，但不知道如何操作.

I suspect this I need to mock the HostingEnvironment but unaware of how to.

推荐答案

为解决此问题，我定义了一个接口

To resolve this issue I defined an interface

public interface ITaskScheduler
{
    void QueueBackgroundWorkItem(Action<CancellationToken> workItem);
}

在生产代码中，我注入了实现

In production code I inject implementation

public class AspNetTaskScheduler : ITaskScheduler
{
    public void QueueBackgroundWorkItem(Action<CancellationToken> workItem)
    {            
        HostingEnvironment.QueueBackgroundWorkItem(workItem);
    }
}

在测试代码中，我注入了实现

In test code I inject implementation

public class TaskScheduler : ITaskScheduler
{
    public void QueueBackgroundWorkItem(Action<CancellationToken> workItem)
    {
        workItem.Invoke(new CancellationToken());
    }
}

我认为这是一个不错的解决方案，因为单元测试可以正常工作，并且我的排队后台任务的类与HostingEnvironment分离.

I think this is an OK solution since unit tests work and my classes that queue background tasks are decoupled from HostingEnvironment.

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