Autofixture couldnt work with interfaces properties?

Question

I have a class Alias. I have used it with Autofixture and everything have been working OK. The tests started to fail however when I've added an interface property to my class.

So that's my class:

public class Alias : NotifyPropertyChanged
{
    private Alias()
    {
        Nicks = new List<string>();
        History = new History(this);
    }
    
    public IDownloader Downloader {get;set;}
}

I am using it in test like that:

Fixture fixture =  new Fixture();

var alias = fixture.Create<Alias>();

And got Exception:

loeh.AutoFixture.ObjectCreationException : AutoFixture was unable to create an instance from Core.Helpers.IDownloader...

I've tried to register the interface by fixture.Register<IVKDownloader>(() => new Downloader()); but I still get this error.

If I change this property to use type instead of the interface public Downloader Downloader {get;set;} everything is working normally. How could I fix this?

possible duplicate of [How to let Autofixture create an instance of a type that contains properties with an interface type?](http://stackoverflow.com/questions/12949417/how-to-let-autofixture-create-an-instance-of-a-type-that-contains-properties-wit) — hometoast, Nov 03 '14 at 18:55
Why do you expect `fixture.Register` to impact how `IDownloader` is being created? — Mark Seemann, Nov 03 '14 at 19:39
Is that a typo of `IVKDownloader` instead of `IDownloder`? If not that might be why it isn't working — John, Nov 03 '14 at 20:39
@Seekeer ok I'll add it as an answer then, glad its working! :) — John, Nov 03 '14 at 21:27

score 6 · Accepted Answer · answered Nov 03 '14 at 21:27

6

fixture.Register<IVKDownloader>(() => new Downloader()); Looks like that is a typo for IDownloader

fixture.Register<IDownloader>(() => new Downloader());

answered Nov 03 '14 at 21:27

John

6,503
3
37
58

Autofixture couldnt work with interfaces properties?

1 Answers1