I've been using FDD for some time and it has worked for me (I'm not using it currently due to some organization constraints).
The question I have is regarding testing. Within the scope of BBF there is a milestone dedicated to testing before promote to build. Unit testing seams to be an ideal fit to this. The problem I have is that for integration testing this "slot" seams inadequate. I would like to know how other have fit Integration Testing into this methodology.