Hi Damian,
Megan and I have finished a first run at writing unit tests for the proc utilities in stem. The code may be found on Megan's Github at: https://github.com/meganchang/Stem/blob/proc-tests/test/unit/util/proc.py. Until we hear back on a code review, we'll move on to the integration tests. Just for reference, here is a link to the ticket as well: https://trac.torproject.org/projects/tor/ticket/6082.
Looking further into the future, we discussed our next project with Stem with Professor Danner today, and agreed that the "Export Tor Desciptors" project would be ideal. ( https://trac.torproject.org/projects/tor/ticket/6171) Do you have any thoughts on this? Otherwise, we just wanted to let you know our plan as we move forward.
-Erik & Megan