AutoFixture fails to CreateAnonymous MVC Controller

Question

The code:

IFixture fixture = new Fixture().Customize(new AutoMoqCustomization());
fixture.Customize<ViewDataDictionary>(c => c.Without(x => x.ModelMetadata));
var target = fixture.CreateAnonymous<MyController>();

the Exception:

System.Reflection.TargetInvocationException: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NotImplementedException: The method or operation is not implemented.

MyController() takes 3 parameters.

I've tried the fix described in the answer here but it wouldn't work.

Caslon

Which version of ASP.NET MVC are you using? How does the MyController constructor look? Does MyController have any writable properties? Does the exception provide more details (e.g. a stack trace)? – Begrime

Answer 1

As it seems, when using MVC 4 you have to customize the Fixture instance in a different way.

The test should pass if you replace:

fixture.Customize<ViewDataDictionary>(c => c
    .Without(x => x.ModelMetadata));

with:

fixture.Customize<ControllerContext>(c => c
    .Without(x => x.DisplayMode));

---

Optionally, you can create a composite of the required customizations:

internal class WebModelCustomization : CompositeCustomization
{
    internal WebModelCustomization()
        : base(
            new MvcCustomization(),
            new AutoMoqCustomization())
    {
    }

    private class MvcCustomization : ICustomization
    {
        public void Customize(IFixture fixture)
        {
            fixture.Customize<ControllerContext>(c => c
                .Without(x => x.DisplayMode));
        }
    }
}

Then, the original test could be rewritten as:

[Fact]
public void Test()
{
    var fixture = new Fixture()
        .Customize(new WebModelCustomization());

    var sut = fixture.CreateAnonymous<MyController>();

    Assert.IsAssignableFrom<IController>(sut);
}

Bromide

Note to others: I had to add a reference to System.Web.WebPages to get this to compile – Deepfry

FYI this is also required for MVC 5.1.2. – Entity

One issue is that whatever I do, the "c.Without" section throws a compile error. – Voroshilovgrad