[TIP] yield-tests and fixtures: should they have a future?

Ronny Pfannschmidt Ronny.Pfannschmidt at gmx.de
Fri Dec 21 02:37:57 PST 2012

Hi all,

My oppinion on yield Tests is,
that they should be turned into part of reporting extensions
instead of their current place at running/collection

i would like to have more than one report for functional/acceptance 
tests anyway
preferably in a way that allows parts to fail but still run the complete 

with that in place a yield test would be just a loop running the check 
of all items without propagating single item failures to the outside

also there is another upcoming task
yield tests based on the the new async api


On 12/21/2012 10:51 AM, holger krekel wrote:
> Hi testing folks, hi Jason,
> i am looking at some recent pytest issues and would like to simplify
> pytest's internal fixture handling.  One obstacle/complication are
> yield-tests, i.e. the style of producing tests with a generator::
>      def test_gen(self):
>          for x in range(10):
>              yield check, x
> This currently produces 10 test items, calling the "check" function with the
> respective parameter.  This by itself is not a big deal to support.
> However, some people expect fixtures/setup_function/method functions to execute
> before the generator does and this mixes the collection with the runtest phase.
> Unfortunately, nose also supports this notion although i am wondering how
> nose2 is going to deal with it as Jason also plans to separate collection
> from running.
> So i am thinking about dropping fixture/setup support for yield-tests in pytest
> but OTOH i'd like to keep backward and nose compatibility.  As far as pytest
> is concerned, it has many others means of parametrization independently
> from yield, see e. g. http://pytest.org/latest/fixture.html#fixture-parametrize
> and http://pytest.org/latest/parametrize.html and more and more people
> are starting to use those (pytest does not document or recommend yield
> for 1-2 years now).
> If anyone has any input/thoughts on this, please shoot.
> best,
> holger
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