Hi!I've just started a new project using Twisted and I want to write unit tests since the beginning. Unfortunately I've got some trouble understanding how should I do it. I read 'Test-driven development with Twisted', read some articles on the web and searched on the mailing list but I couldn't find anything which make it clear for me.
I've got a class:class SessionCleaner(object):def __init__(self, session_db, interval=10):self.session_db = session_dbself.lc = task.LoopingCall(self.check_old_sessions)self.lc.start(interval)@defer.inlineCallbacksdef check_old_sessions(self):log.msg('check_old_sessions()', logLevel=logging.DEBUG)try:old_sessions = yield self.session_db.get_old_sessions()for s in old_sessions:yield self.session_db.process_stopped(s)except txredisapi.ConnectionError as e:log.msg('check_old_sessions - connection error {}'.format(e), logLevel=logging.WARNING)
session_db is a object with methods which makes some calls to Redis.
Testing if __init__ works correctly is easy - I can mock task.LoopingCall and check if it was called with correct attributes.
I've got trouble testing check_old_sessions. Since I'm writing unit tests I don't want to call real session_db methods and make real Redis queries. I'd like to mock them and test just few things:
- is the method get_old_sessions called?
- is the method process_stopped called N times with the arguments returned by mocked get_old_sessions?
- is txredisapi.ConnectionError handled correctly?
So is there any "right" way of mocking functions which returns deferreds? Or maybe I should test this method differently?
Best regards,Patryk
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