[Python-modules-team] Bug#859916: Fails on simple test from documentation

[Guido Günther]

Package: python-pytest
Version: 3.0.6-1
Severity: grave

(this only affects python-pytest, python-pytest3 is fine):

The simple test from the documentation

    https://docs.pytest.org/en/latest/getting-started.html#installation

cat <<EOF > test_sample.py
def func(x):
    return x + 1

def test_answer():
    assert func(3) == 5
EOF

fails to load at all:

$ pytest 
=============================================================================================== test session starts ===============================================================================================
platform linux2 -- Python 2.7.13, pytest-3.0.6, py-1.4.32, pluggy-0.4.0
rootdir: /tmp/a, inifile: 
plugins: django-assets-0.12
collected 1 items 

test_sample.py E

===================================================================================================== ERRORS ======================================================================================================
__________________________________________________________________________________________ ERROR at setup of test_answer __________________________________________________________________________________________

    @pytest.fixture(autouse=True)
    def set_django_assets_env():
>       django_assets.env.get_env() # initialise django-assets settings

/usr/lib/python2.7/dist-packages/django_assets/pytest_plugin.py:6: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/usr/lib/python2.7/dist-packages/django_assets/env.py:177: in get_env
    env = DjangoEnvironment()
/usr/lib/python2.7/dist-packages/webassets/env.py:701: in __init__
    self.config.setdefault('debug', False)
/usr/lib/python2.7/dist-packages/webassets/env.py:64: in setdefault
    self.__setitem__(key, value)
/usr/lib/python2.7/dist-packages/django_assets/env.py:65: in __setitem__
    setattr(settings, self._transform_key(key), value)
/usr/lib/python2.7/dist-packages/django/utils/functional.py:264: in __setattr__
    self._setup()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <LazySettings [Unevaluated]>, name = None

    def _setup(self, name=None):
        """
            Load the settings module pointed to by the environment variable. This
            is used the first time we need any settings at all, if the user has not
            previously configured the settings manually.
            """
        settings_module = os.environ.get(ENVIRONMENT_VARIABLE)
        if not settings_module:
            desc = ("setting %s" % name) if name else "settings"
            raise ImproperlyConfigured(
                "Requested %s, but settings are not configured. "
                "You must either define the environment variable %s "
                "or call settings.configure() before accessing settings."
>               % (desc, ENVIRONMENT_VARIABLE))
E           ImproperlyConfigured: Requested settings, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.

/usr/lib/python2.7/dist-packages/django/conf/__init__.py:39: ImproperlyConfigured
============================================================================================= 1 error in 0.05 seconds =============================================================================================



-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'stable-updates'), (500, 'unstable'), (500, 'stable'), (500, 'oldstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages python-pytest depends on:
ii  python-pkg-resources  33.1.1-1
ii  python-py             1.4.32-3
pn  python:any            <none>

python-pytest recommends no packages.

Versions of packages python-pytest suggests:
ii  python-mock  2.0.0-3

-- no debconf information