How do I unit test an ActionFilter in ASP.NET MVC?

Question

There is an ActionFilter on my controller-class. The OnActionExecuting method gets called, when an action of the controller is called in a web appl

Answer 1

to write a separate unit test which proves that the action is decorated with the correct attribute

Here is how you can write such a unit test

Type t = typeof(MyController);
Assert.IsTrue(t.GetCustomAttributes(typeof(MyCustomAttribute)).Length > 0);