在xunit测试中模拟HostingEnvironment.QueueBackgroundWorkItem

本文介绍了在xunit测试中模拟HostingEnvironment.QueueBackgroundWorkItem的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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.