Mocking HttpActionContext.ActionArguments when testing Web.Api ActionFilter

Question

I am writing an OnActionExecuting action filter and I want to unit test the functionality.

One of the things the filter needs to do is to performs some validation on the action arguments passed into the filter.

I am getting the arguments from the actionContext.ActionArguments Dictionary which is working fine for the implementation but I am having a difficult time managing to unit test it.

In my test I cannot set actionContext.ActionArguments as it has no setter an nor can I mock it as it is not virtual.

This leaved me in a bit of a quandary as to whether I can get any value from unit tests in this scenario?

Van · Accepted Answer · 2013-10-03 01:44:14Z

12

According to the AspNetWebStack source code, actionContext.ActionArguments is just a simple Dictionary. It is therefore pretty trivial to insert a key value pair into it. I would just do something like

actionContext.ActionArguments[key] = value;

in the arrange part of the unit test.

Hope that helps

answered Oct 3, 2013 at 1:44

Van

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Dondee Tan · Accepted Answer · 2016-09-20 21:22:45Z

6

See my blog for this: https://dondeetan.com/2016/09/19/validating-and-unit-testing-web-api-2-route-attribute-parameters/

 var mockactioncontext = new HttpActionContext
            {
                ControllerContext = new HttpControllerContext
                {
                    Request = new HttpRequestMessage()
                },
                ActionArguments = { { "employeeid", "null" } }
            };

            mockactioncontext.ControllerContext.Configuration = new HttpConfiguration();
            mockactioncontext.ControllerContext.Configuration.Formatters.Add(new JsonMediaTypeFormatter());

            var filter = new <youractionattributefilterclass>();
            filter.OnActionExecuting(mockactioncontext);
            Assert.IsTrue(mockactioncontext.Response.StatusCode == HttpStatusCode.BadRequest);

answered Sep 20, 2016 at 21:22

Dondee Tan

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2 Comments

Gerrit Over a year ago

Do you know why not an instance of Dictionary<string, object> can be passed to ActionArguments? It fails for me and says ActionArguments is read-only.

Dondee Tan Over a year ago

Sorry late response. Haven't try that.

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