Re: adding a simulation mode

From	Paul Rubin <no.email@nospam.invalid>
Newsgroups	comp.lang.python
Subject	Re: adding a simulation mode
References	<mailman.1786.1341394979.4697.python-list@python.org>
Date	2012-07-04 10:01 -0700
Message-ID	<7x7guj4g03.fsf@ruckus.brouhaha.com> (permalink)
Organization	Nightsong/Fort GNOX

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andrea crotti <andrea.crotti.0@gmail.com> writes:
> copytree(src, dest) becomes:
> if not PRETEND_ONLY:
>     copytree(src, dest)
>
> But I don't like it too much because I would have to add a lot of
> garbage around..

I've had good results writing the module under test in the style of a
java applet, i.e. one of its args is a class instance representing the
"outside world", and ALL interaction that you might want to simulate is
done through this object:

   def your_prog(parent):
      conn = parent.db.make_connection(...)
      blah = parent.copytree(...)

Then you make "real" and "mock" versions of the external interface, and
pass in an appropriate instance.

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adding a simulation mode andrea crotti <andrea.crotti.0@gmail.com> - 2012-07-04 10:42 +0100
  Re: adding a simulation mode Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-04 13:41 +0000
    Re: adding a simulation mode andrea crotti <andrea.crotti.0@gmail.com> - 2012-07-04 14:59 +0100
    Re: adding a simulation mode andrea crotti <andrea.crotti.0@gmail.com> - 2012-07-04 15:19 +0100
  Re: adding a simulation mode Paul Rubin <no.email@nospam.invalid> - 2012-07-04 10:01 -0700

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