[Twisted-Python] Unit testing AMP responder method registration

Hi! I'm trying to write code using TDD and AMP. I'm trying to figure out how to write a unit test for: @MyCommand.responder Specifically, I would assume that test: 1. Tests that the responder locator has a responder for MyCommand; 2. That responder matches the decorated method (1) is easy, (2) not so much. Since usually the responder locator gives me this nasty "doit" function that isn't introspectable (unless it.func_closure[0].cell_contents.im_func counts as "introspection"), I'm not sure how to write that unit test. I do have end-to-end tests for this, obviously: I would like to also have regular tests :) thanks in advance lvh