如何使用Nunit和RhinoMocks模拟HttpContext.Current.GetOwinContext()? [英] How to mock HttpContext.Current.GetOwinContext() with Nunit and RhinoMocks?

问题描述

与相比，我关于模拟的最后一个问题HttpContext ，我不得不将要测试的方法更改为

Compared to my last question on Mocking the HttpContext, I had to change the method being tested to

public override void OnActionExecuting(HttpActionContext actionContext)
{
    HttpContext.Current.GetOwinContext().Set("RequestGUID", NewId.NextGuid());
    base.OnActionExecuting(actionContext);
}

现在我需要弄清楚如何模拟 HttpContext.Current.GetOwinContext()， 因此，我可以为Set()方法编写存根，或者通常能够测试此特定行.我怎样才能做到这一点?

Now I need to figure out how to mock the HttpContext.Current.GetOwinContext(), So I could write a stub for the Set() method, or generally being able to test this particular line. How can I do this?

推荐答案

我已阅读

I have read this article, but in your case, I think that doing such a thing would be an overkill..

由于GetOwinContext()返回一个接口，所有您需要做的就是将该调用与方法分开，这样做有两个问题:

Since GetOwinContext() return an interface all you have to do is to separate this call from the method, doing such a thing has 2 problems:

1. 被测方法(OnActionExecuting()由属性类拥有.
2. GetOwinContext()是静态方法.

1. The method under test(OnActionExecuting() is owned by an attribute class.
2. GetOwinContext() is a static method.

我能为您提供的2种最佳解决方案是:

The best 2 solutions that I can offer you is:

1. 使用诸如MsFakes，Typemock Isolator之类的代码挥舞工具，而不是基于RhinoMocks的基于代理的工具.
2. 将GetOwinContext()提取为虚拟方法，然后使用PartialMock技术(该技术通常用于抽象类):

1. Use code waving tool like MsFakes, Typemock Isolator and etc, instead of proxy based tool like RhinoMocks.
2. Extract GetOwinContext() to a virtual method and then use PartialMock technique(This technique is usually in use for abstract classes):

让我们说MyCustonAttributte是您的属性:

public class MyCustonAttributte : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        GetOwinContext().Set("RequestGUID", Guid.NewGuid());
        base.OnActionExecuting(actionContext);
    }

    public virtual IOwinContext GetOwinContext()
    {
        return HttpContext.Current.GetOwinContext();
    }
}

那么您的UT将是:

[Test]
public void New_GUID_should_be_added_when_OnActionExecuting_is_executing()
{
    //arrange section:
    const string REQUEST_GUID_FIELD_NAME = "RequestGUID";
    var owinContext = MockRepository.GenerateStub<IOwinContext>();

    var target = MockRepository.GeneratePartialMock<MyCustonAttributte>();

    target.Stub(x => x.GetOwinContext())
        .Return(owinContext);

    //act:
    target.OnActionExecuting(new HttpActionContext());

    //assert section:
    owinContext.AssertWasCalled(x => x.Set(Arg<string>.Is.Equal(REQUEST_GUID_FIELD_NAME),
        Arg<Guid>.Is.NotEqual(Guid.Empty)));
}

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