[TIP] Learning fixtures in py.test

[Brianna Laugher]

While it's difficult to debug without seeing your actual test code (your
example doesn't use session or setup_session), it seems like you may be
close. If your fixture's name is 'setup_session', that's the name you need
to use within the test function - not 'session'.

cheers
Brianna


On 25 October 2013 08:02, Paradox <paradox at pobox.com> wrote:

> I am trying to understand fixtures and how they are used.  I am writing
> tests for my program that interacts with an Sqlite database using
> Sqlalchemy.  I am working on Python 2.7.5 in Ubuntu 13.10.
>
> My setup_session fixture is:
>
> =================
> @pytest.fixture (autouse = True)
> def setup_session():
>     db_file = 'database.db'
>     engine = create_engine('sqlite:///' + db_file, echo = True)
>     Base = declarative_base()
>     Session = sessionmaker(bind=engine)
>     session = Session()
>     return session
> ==================
>
> Then when I try to use that fixture in a test it is something like:
> ==================
> def test_get_id_of_row(setup_**session):
>     assert(get_id_of_row('cell known to be in test data')==1)
> ==================
>
> I am getting an error:
> ==================
> NameError: global name 'session' is not defined
> ==================
>
> Shouldn't that be taken care of by passing the setup_session fixture to
> the test function?  There is something I don't get about fixtures and would
> appreciate any pointers on where to read to better understand, I have read
> the pytest.org site on fixtures several times and it is still not sinking
> in!
>
> thomas
>
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