[TIP] Getting Weird Coverage Reports

John Anderson sontek at gmail.com
Fri Nov 25 04:07:29 PST 2011

On Fri, Nov 25, 2011 at 6:00 AM, Michael Foord <michael at voidspace.org.uk>wrote:

>  On 25/11/2011 11:55, John Anderson wrote:
> I have a base class that all my models inherit from:
>  http://paste2.org/p/1796621
>  and majority of my tests are touching models and I even have tests
> against this specific class:
>  http://paste2.org/p/1796622
>  Yet, when I run a coverage test in py.test:
> py.test --cov-report=term-missing --cov app/models.py
>  app/models      46     23    50%   1-27, 37-40, 59, 65, 76, 82-84
>  How are lines 1-27 not covered?
> All of those lines (imports, class definition, decorator application) are
> executed at *import time* (i.e. when the module is first created). The fact
> that those lines are reported as not covered implies to me that you are
> starting the test run (and therefore importing your models) before coverage
> is started.
> You need to run your tests under the coverage tool, or ensure that
> coverage tracing is started before any imports execute.
Ahh, So I have some py.test configuration, so that a test database is set
to a clean slate when I start my tests, I thought pytest_configure would be
late enough, but I guess its not?  This is what i'm doing:

from test_settings import settings
from pyramid.config import Configurator
from app.models import register_models
from app.models import Entity

def pytest_configure():
    url = settings.get('sqlalchemy.url')
    echo = settings.get('sqlalchemy.echo')

    print 'Creating the tables on the test database %s' % url

    config = Configurator(settings=settings)


    Entity.setup_database(url, echo=echo, drop=True, create=True)
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