/ ActionFilters

Unit Testing ASP.NET MVC Controller Action contains specific ActionFilter Attributes

ActionFilters in ASP.NET MVC are great.

You can now easily share logic between controllers without having to inherit from a base controller, that does the common work.

I have a content heavy application that supports a set of layouts. Each layout is rendered by setting the Layout view dynamically, which I do from an ActionFilter. My ActionFilter is fully tested, but when you delegate work to an ActionFilter, you should write a test that ensures the filter is defined on the action.

Not surprisingly, this is very simple and relies on reflection (Download from Gist: https://gist.github.com/2605628):


/// Verifies the controller action, contains an attribute of the specified attributeType. /// /// The controller. /// The action method. /// Type of the attribute to look for. /// Returns true if the attribute was present on the action. Otherwise false. public static bool VerifyControllerActionAttribute(this Controller controller, Func action, Type attributeType) { MethodInfo methodInfo = action.Method; object[] attributes = methodInfo.GetCustomAttributes(attributeType, true); return attributes.Any(a => a.GetType() == attributeType); }

And the usage looks like this:

[TestMethod] public void Index_ContainsTemplateLayoutAttribute() { HomeController controller = new HomeController(); bool containsAttribute = controller.VerifyControllerActionAttribute(controller.Index, typeof(TemplateLayoutAttribute)); Assert.IsTrue(containsAttribute); }

Need an introduction? Watch a video about unit testing ASP.NET and MVC based web apps on Vimeo, published by Typemock.

Unit Testing ASP.NET MVC Controller Action contains specific ActionFilter Attributes
Share this

Subscribe to Martin Normark's Blog