如何测试与工作的ModelState ActionFilterAttributes？ [英] How do I test ActionFilterAttributes that work with ModelState?

问题描述

正如所建议的（等等）卡子门祖尔拉希德在这个博客帖子，我使用 ActionFilterAttributes 来重定向时模型的状态从一个请求传输到另一个。

As suggested by (among others) Kazi Manzur Rashid in this blog post, I am using ActionFilterAttributes to transfer model state from one request to another when redirecting.

不过，我发现自己不能写一个单元测试，测试这些属性的行为。作为一个例子，这就是我想要用于测试的 ImportModelStateAttribute 来做到：

However, I find myself unable to write a unit test that test the behavior of these attributes. As an example, this what I want the test for the ImportModelStateAttribute to do:

1. 设置的 filterContext 让的TempData [的myKey] 包含了一些假冒出口 ModelState中（即一个 ModelStateDictionary 创建自己，添加一个错误）


2. 请的ModelState 包含一个模型误差。


3. 呼叫 OnActionExecuting 。


4. 确认两个字典合并，而的ModelState 现在包含的两个的错误。

1. Setup the filterContext so that TempData[myKey] contains some fake "exported" ModelState (that is, a ModelStateDictionary I create myself, and add one error to)
2. Make ModelState contain one model error.
3. Call OnActionExecuting.
4. Verify the two dictionaries are merged, and ModelState now contains both errors.

我在的第一步已经出现亏损。

I'm at a loss already on the first step.

编辑：结果
是的，我已经试过嘲弄 ActionFilterAttribute 与起订量，但我得到的错误，指出

Yes, I've tried mocking ActionFilterAttribute with Moq, but I get errors stating

在非覆盖的成员设置无效

Invalid setup on non-overridable member

为的TempData 和的ModelState 。

推荐答案

托马斯，你不必嘲笑filterContext，可以用于测试操作筛选器创建实际的对象，同样也适用于模型的状态，这些都是POCO的对象。只有你所嘲笑的事情是HttpContext的（如果需要）。

Tomas, You do not have to mock the filterContext, you can create the real object for testing the action filter, the same goes for the model state, these are poco objects. Only thing that you have to mock is the HttpContext (if needed).

[Fact]
public void Should_import_complete_view_data()
{
    var attribute = new ImportViewDataFromTempDataAttribute();

    var httpContext = new Mock<HttpContextBase>();
    var requestContext = new RequestContext(httpContext.Object, new RouteData());

    var previousModel = new object();
    var previousViewData = new ViewDataDictionary(previousModel) {{"foo", "bar"}};

    previousViewData.ModelState.AddModelError("foo", "bar");

    var controller = new Mock<ControllerBase>();
    controller.Object.ViewData = new ViewDataDictionary();
    controller.Object.TempData = new TempDataDictionary { { attribute.Key, previousViewData } };

    var controllerContext = new ControllerContext(requestContext, controller.Object);
    var actionContext = new ActionExecutingContext(controllerContext, new Mock<ActionDescriptor>().Object, new Dictionary<string, object>());

    attribute.OnActionExecuting(actionContext);

    Assert.True(actionContext.Controller.ViewData.ContainsKey("foo"));
    Assert.True(actionContext.Controller.ViewData.ModelState.ContainsKey("foo"));
    Assert.Same(previousModel, actionContext.Controller.ViewData.Model);
}

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