[orend]

As I mention in the post, I'd also be perfectly happy with the original if the rest of the application was small and simple. It's hard to come up with an example that's both meaningful and not too long for a blog post.

As for the testing issue, we have a controller-like object there, and a controller’s job is to coordinate sending messages between collaborators so I don't think a unit test for this object should test anything than these interactions. This also might be a consequence of using a simple example.