Code review comment for lp:~statik/mup/stop-the-line

I'm requesting a review of this branch as I'd like some implementation advice - it's not yet ready to land.

I think I've got the plugin skeleton hooked up correctly, and a basic entry point for unit tests of the plugin, but I'm not sure how to write a unit tests that checks to see if the plugin responds correctly to a command. A quick glance over the plugin and a tip or two on getting the unit test written will help me a lot, and should give me enough to figure out the rest of it. Thanks!