Is there any way to create a fake from a System.Type object in FakeItEasy?

Question

Is there any way to create a fake from a System.Type object in FakeItEasy? Similar to:

var instance = A.Fake(type);

I try to write a fake container for AutoFac that automatically return fakes for all resolved types. I have looked in the code for FakeItEasy and all methods that support this is behind internal classes but I have found the interface IFakeObjectContainer that looks pretty interesting, but the implementations still need registration of objects that is the thing that I want to come around.

A glance over the FakeItEasy API would suggest they don't support this. However, I could be wrong. An alternative would be to use the AutoMockContainer in [AutofacContrib](http://code.google.com/p/autofac/downloads/list). — bentayloruk, Jul 07 '11 at 13:07

score 3 · Accepted Answer · edited Jun 02 '18 at 16:49

3

As of FakeItEasy 2.1.0 (but do consider upgrading to the latest release for more features and better bugfixes), you can create a fake from a Type like so:

using FakeItEasy.Sdk;

…

object fake = Create.Fake(type);

If you must use an earlier release, you could use some reflection based approach to create a method info for the A.Fake() method. (since it's about auto mocking this shouldn't be a problem really).

edited Jun 02 '18 at 16:49

Blair Conrad

233,004
25
132
111

answered Jul 09 '11 at 21:08

Patrik Hägne

16,751
5
52
60

Actually, you could support interfaces only out of the box: A.Fake – Patrik Hägne Jul 09 '11 at 21:10
I just downloaded the latest version of FakeItEasy and can still not find a way to do this. Is there a method that I am missing or didn't this feature manage to get into this release? – Martin Odhelius Sep 30 '11 at 12:00

score 1 · Answer 2 · answered Jul 08 '11 at 07:10

This is best done using a registration handler. You should look into how AutofacContrib.Moq implements its MoqRegistrationHandler. You'll see that it is actually using the generic method MockRepository.Create to make fake instances. Creating a similar handler for FakeItEasy should be quite simple.

Is there any way to create a fake from a System.Type object in FakeItEasy?

2 Answers2