Unit tests on MVC validation

Question

How can I test that my controller action is putting the correct errors in the ModelState when validating an entity, when I\'m using DataAnnotation validation in MVC 2 Previe

Answer 1

If you care about validation but you don't care about how it is implemented, if you only care about validation of your action method at the highest level of abstraction, no matter whether it is implemented as using DataAnnotations, ModelBinders or even ActionFilterAttributes, then you could use Xania.AspNet.Simulator nuget package as follows:

install-package Xania.AspNet.Simulator

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var action = new BlogController()
    .Action(c => c.Index(new BlogPost()), "POST");
var modelState = action.ValidateRequest();

modelState.IsValid.Should().BeFalse();