如何使用RenderPartialViewToString为返回JsonResult的方法编写单元测试? [英] How To Write Unit Test For Method Returning JsonResult With RenderPartialViewToString?

问题描述

如果您查看此链接上的示例:

If you look at the example at this link:

http://www. atlanticbt.com/blog/asp-net-mvc-using-ajax-json-and-partialviews/

一个人如何为JsonAdd方法编写单元测试?我自己的代码中也有类似的情况，但是调用时出现RenderPartialViewToString错误:

How would one write a unit test for the JsonAdd method? I have a similar situation in my own code, but the RenderPartialViewToString errors when calling:

ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView

ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView

我尝试了各种方法来尝试对无效的调用进行存根.任何帮助表示赞赏.谢谢.

I've tried different ways of trying to stub that call to no avail. Any help appreciated. Thanks.

推荐答案

由于ViewEninges是静态类，因此您无法使用RhinoMocks对其进行模拟.我认为您最好的选择是创建一个局部视图渲染器"界面.接口是可模拟的，因此您可以消除渲染视图的复杂性.这是一些快速的伪代码.

Since ViewEninges is a static class, you can't mock it with RhinoMocks. I think your best bet is to create a "partial view renderer" interface. An interface is mockable so you'll be able to stub out the complexity of rendering the view. Here's some quick pseudo-code thrown together.

首先，定义部分视图渲染器接口:

First, define the partial view renderer interface:

public interface IRenderPartialView
{
    string Render(string viewName, object model);
}

然后，将基类的RenderPartialViewToString更改为IRenderPartialView.Render的实现:

Then, change your base class' RenderPartialViewToString to be the implementation of IRenderPartialView.Render:

public abstract class BaseController : Controller, IRenderPartialView
{
...
    public string Render(string viewName, object model)
    {
        // same code as RenderPartialViewToString
    }
}

现在，我们需要更改您的控制器构造函数，以便我们可以在测试期间注入IRenderPartialView，但是在生产过程中使用基类.我们可以通过使用一对构造函数来完成此任务:

Now we need to change your controller constructors so we can inject an IRenderPartialView during testing -- but use the base class one during production. We can accomplish this by using a pair of constructors:

public class YourController : BaseController
{
        private IRenderPartialView partialRenderer;

        public YourController()
        {
            SetRenderer(this);
        }

        public YourController(IRenderPartialView partialRenderer)
        {
            SetRenderer(partialRenderer);
        }

        private void SetRenderer(IRenderPartialView partialRenderer)
        {
            this.partialRenderer = this;
        }
}

现在，JsonAdd可以调用部分视图渲染器了:

Now, JsonAdd can call the partial view renderer:

public JsonResult JsonAdd(AddPersonViewModel AddPersonModel)
{
    ...
    return Json(new
    {
        Success = true,
        Message = "The person has been added!",
        PartialViewHtml = partialRenderer.Render("PersonList", new PersonListViewModel {PersonList = _personList})
    });
}

因此，在测试期间，您将模拟出IRenderPartialView并将其发送到接受IRenderPartialView的构造函数.在生产过程中，当ASP.NET MVC调用默认构造函数时，它将使用控制器作为渲染器(在基类中具有IRenderPartialView.Render的实现).

So, during testing, you'll mock out an IRenderPartialView and send that to the constructor that accepts an IRenderPartialView. During production, when ASP.NET MVC calls your default constructor, it will use the controller as the renderer (which has the implementation of IRenderPartialView.Render inside the base class).

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