I like to test a method, that takes a object and add some values to the object. The object is not returned by the method - but the reference is used.

This is an exsample:

ImageList imagesList = new ImageList(); images.Add(new ImageData { SomeInt = 100 }); ImageList imageList2 = null;

Mock.Setup(foo => foo.Identify(imagesList)) .Callback<ImageList>(i => imageList2 = i);

Mock.Process(imagesList); Assert.IsNotNull(imageList2 ); //fail

How can I get the "Callback feature" to return the object that was "setup" for the test?