What is a good way to unit test this amp responder which will call a process? Other things it does are covered with other tests thanks to the tests I copied from lp:game. That should be a pretty awesome game or at least it will work. Should the test actually spawn a process or only pretend to? test_process already tests spawnProcess after all. def test_StartProcess(self): """ When L{StartProcess} is issued client starts a process and returns a status code """ responder = self.controller.lookupFunction(StartProcess.commandName) d = responder({ 'identifier': self.identifier, 'cmd':'/bin/ls', 'args':'' }) def gotStartProcess(a): # assert something about the process <---- what goes here? d.addCallback(gotStartProcess) return d