Configuring the The<>() directly

gistfile1.txt

Running the tests results in "System.InvalidOperationException: 
The result for IContactRepository.Get(1); has already been setup."

When creating An<IContactRepository> and assigning it by fakeAccessor.Use(), it does work.

public class When_requesting_alex_from_contact_service : WithSubject<ContactService> {
	static Contact _contact;
	static IContact _actualContact;

	Establish context = () => {
		With<Alex>();
		With<AlexRepository>();
	};

	Because of = () => { _actualContact = Subject.GetContact(1); };

	It should_return_the_contact = () => { _actualContact.ShouldEqual(The<IContact>()); };
}

public class AlexRepository {
	OnEstablish context =
		fakeAccessor
			=> {
			fakeAccessor.The<IContactRepository>()
				.WhenToldTo(r => r.Get(1))
				.Return(fakeAccessor.The<IContact>);
		};
}

public class Alex {
	OnEstablish context = fakeAccessor => {
		fakeAccessor.The<IContact>().Id = 1;
		fakeAccessor.The<IContact>().Name = "Alex";
	};
}

public interface IContact {
	string Name { get; set; }
	int Id { get; set; }
}

public class Contact : IContact {
	public string Name { get; set; }
	public int Id { get; set; }
}

public class ContactService {
	readonly IContactRepository _contactRepository;

	public ContactService(IContactRepository contactRepository) {
		_contactRepository = contactRepository;
	}

	public IContact GetContact(int id) {
		return _contactRepository.Get(id);
	}
}

public interface IContactRepository {
	IContact Get(int id);
}

Yap, that's definately a bug. Has already been fixed on the dev branch and will be part of the next nuget release: https://github.com/BjRo/Machine.Fakes/commit/8fd49b78f9e5073bc43488e5ee561e9fd2513c1e