[TIP] pytest fixture autouse question

[holger krekel]

On Wed, Jan 09, 2013 at 17:29 -0500, Pella,Chris wrote:
> > -----Original Message-----
> > From: holger krekel [mailto:holger at merlinux.eu]
> > Sent: January-04-13 4:57 AM
> > To: Pella,Chris
> > Cc: testing-in-python at lists.idyll.org
> > Subject: Re: [TIP] pytest fixture autouse question
> > 
> > Hey Chris,
> > 
> > On Thu, Jan 03, 2013 at 14:20 -0500, Pella,Chris wrote:
> > > I may have a misunderstanding of when session-level autouse fixtures are
> > called. I am trying to create a session level fixture that runs before once per
> > test session before any class setup is called.
> > 
> > It's a known issue of mixing xUnit and pytest style fixtures. See here for a
> > discussion and the planned resolution:
> > 
> >     http://mail.python.org/pipermail/pytest-dev/2012-December/002172.html
> > 
> > For now, you can work around the issue like this::
> > 
> >     class TestX:
> >         @pytest.fixture(scope="class", autouse=True)
> >         def setup_on_class(self):
> >             ...
> > 
> I now see a problem with this workaround ... e.g. If I run the following code it will throw an exception because cls.skip_me is no longer accessible. 
> 
> class TestThis():
>     @pytest.fixture(scope="class", autouse=True)
>     def setup_class(cls):
>         #cls.skip_me = True 
>         cls.skip_me = False
> 
>     def test_one(cls):
>         if cls.skip_me == True:
>             pytest.skip("can't test this")
>         assert 1
> 
>     def test_two(cls):
>         if cls.skip_me == True:
>             pytest.skip("can't test this")
>         assert 1
> 
>     def teardown_class(cls):
>         pass

sorry, my bad.  I forgot to write down @classmethod:

     @classmethod
     @pytest.fixture(scope="class", autouse=True)
     def setup_class(cls):
         #cls.skip_me = True 
         ...

This will make the above example work.  note though, that the test
methods should better "self", not "cls".  All class attributes
(including "TestThis.skip_me") will be visible on the "self" instance
seen by the test methods.

best,
holger



you need to use 
> 
> > This will execute after th "session" scoped installer that you describe below.
> > 
> > cheers,
> > holger
> > 
> > > I have conftest.py file in the directory where the tests reside and in there I
> > have some code that installs some client software on the test node.  We only
> > want to install the client once per session for all the test classes that get
> > executed.
> > >
> > > @pytest.fixture(scope="session",autouse=True)
> > > def installer_fixture(request):
> > >     """
> > >     Installs client at the session level
> > >     """
> > >     print "installing"
> > >     client = InstallClient()
> > >     client.install()
> > >     time.sleep(60)
> > >
> > >     def uninstall():
> > >         """
> > >         Uninstall client
> > >         """
> > >         client.uninstall()
> > >
> > >     request.addfinalizer(uninstall)
> > >
> > >
> > > I assumed that this would execute prior to any test setup for a particular
> > test class since it is a session level fixture, but I find that setup_class()
> > executes before the clients get installed.
> > >
> > > e.g. with some toy test code I find  that the class setup gets executed
> > before the fixture.  This is not the behaviour I wanted or expected.
> > >
> > > import pytest
> > >
> > >
> > > class TestMe:
> > >
> > >     def setup_class(cls):
> > >         pytest.set_trace()
> > >         print "setup"
> > >
> > >     def test_one(cls):
> > >         print "test one"
> > >
> > >     def teardown_class(cls):
> > >         print "teardown"
> > >
> > >
> > >
> > >
> > > Thanks,
> > > chris
> > >
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