Thanks for the tips, Mockito work great with Trial. But it's a bit lazy for my needs, I think I''ll try to use Mock (http://www.voidspace.org.uk/python/mock/) Thx --- En date de : Mar 21.2.12, Johan Rydberg <johan.rydberg@edgeware.tv> a écrit : De: Johan Rydberg <johan.rydberg@edgeware.tv> Objet: Re: [Twisted-Python] Which mocker tool for trial ? À: nicolas.agius@lps-it.fr, "Twisted general discussion" <twisted-python@twistedmatrix.com> Date: Mardi 21 février 2012, 8h58 We're using python-mockito and it works pretty good.  I've also hacked it a bitso that it works with zope interfaces.  See this post, which also contains a linkto the bitbucket project: http://jrydberg.me/post/10519590583/strict-mocking-with-zope-interfaces On Feb 20, 2012, at 6:04 PM, Nicolas AGIUS wrote: Which tool are you using for mocking ?