如何进行单元测试调用扩展方法html.EditorFor [英] How to unit test an extension method that calls html.EditorFor

问题描述

在一个扣球，我创建了一个漂亮的HTML辅助扩展方法在我的看法使用，效果不错。它会让我的意见，以便更容易维护。

During a spike, I created a nifty html helper extension method for use in my views, it worked well. It will make my views so much easier to maintain.

现在我需要弄清楚如何进行单元测试。下面是我所试图做的要点：

Now I need to figure out how to unit test it. Here is the gist of what I am trying to do:

public static MvcHtmlString EditorOrDisplayForBasedOnConvolutedBusinessLogic<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression)
{
    if (ConvolutedBusinessLogic())
    {
        return html.EditorFor(expression);
    }
    else
    {
        return html.DisplayFor(expression);
    }
}

这两个EditorFor和DisplayFor本身的扩展方法。如何在我的单元测试，我可以断言，基于输入我的ConvolutedBusinessLogic，要么EditorFor或DisplayFor被称为合适？如果做不到这一点，我怎么能树立正确的存根/假货/嘲笑，这样调用EditorFor或DisplayFor不抛出一个NullReferenceException，然后我可以断言返回的内容是正确的？

Both EditorFor and DisplayFor are themselves extension methods. How in my unit tests, can I assert that based on the input for my ConvolutedBusinessLogic, that either EditorFor or DisplayFor are called as appropriate? Failing that, how can I set up the right stubs/fakes/mocks so that the call to EditorFor or DisplayFor dont throw a NullReferenceException and then I can assert the content returned is correct?

推荐答案

我的嘲笑下，不完全不够的。切换到使用假货建立了基于<一个href=\"http://offroad$c$cr.com/index.php/2011/08/unit-testing-asp-net-html-helpers-with-simple-fakes/\" rel=\"nofollow\">http://offroad$c$cr.com/index.php/2011/08/unit-testing-asp-net-html-helpers-with-simple-fakes/和它的所有工作。

My mocked context was not complete enough. Switched to using fakes built based on http://offroadcoder.com/index.php/2011/08/unit-testing-asp-net-html-helpers-with-simple-fakes/ and it all worked.

我仍然欢迎就如何嘲笑它，而不是采用全套假货的答案。

I'd still welcome an answer on how to mock it instead of using a full set of fakes.

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