How do I test ActionFilterAttributes that work with ModelState?

Posted by Tomas Lycken on Stack Overflow See other posts from Stack Overflow or by Tomas Lycken
Published on 2010-04-10T20:28:24Z Indexed on 2010/04/10 20:33 UTC
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Filed under:

c#

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asp.net-mvc

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actionfilter

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modelstate

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unit-testing

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.

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:

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

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

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