Pytest-django: django_db 표시를 사용하지 않고 전역적으로 데이터베이스 액세스를 허용하는 방법은 무엇입니까?

Django 테스트 러너 기반 테스트를 pytest로 변환하는 데 어려움을 겪고 있습니다.
나는 그 퍼팅을 기대할 것이다

import pytest
pytestmark = pytest.mark.django_db

내 코드에 속한 스택 추적의 마지막 모듈(lib/frontend/decorators.py)
완화할 수 있지만 그렇지 않습니다. 스택 추적에 있는 내 모듈 4개 모두에 넣어도 도움이 되지 않았습니다.

pytest-django에서 데이터베이스 액세스를 전역적으로 허용할 수 있는 방법이 있습니까?

vagrant@vagrant-ubuntu-trusty-64:/vagrant$ pytest 
== test session starts ==
platform linux2 -- Python 2.7.6, pytest-3.0.2, py-1.4.31, pluggy-0.3.1
Django settings: patient.settings (from ini file)
rootdir: /vagrant, inifile: pytest.ini
plugins: django-3.0.0, pythonpath-0.7.1
collected 265 items / 2 errors 

[...]

_ ERROR collecting lib/tests/report/testfunc.py _
lib/tests/report/testfunc.py:6: in <module>
    from report.func import generate_report_filename
lib/report/func.py:29: in <module>
    from frontend import chart
lib/frontend/chart.py:294: in <module>
    @pytest.mark.django_db
lib/frontend/decorators.py:20: in decorator
    if Site.objects.get_current().id in (allowed_site_ids):
/usr/local/lib/python2.7/dist-packages/django/contrib/sites/models.py:60: in get_current
    return self._get_site_by_id(site_id)
/usr/local/lib/python2.7/dist-packages/django/contrib/sites/models.py:39: in _get_site_by_id
    site = self.get(pk=site_id)
/usr/local/lib/python2.7/dist-packages/django/db/models/manager.py:127: in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
/usr/local/lib/python2.7/dist-packages/django/db/models/query.py:328: in get
    num = len(clone)
/usr/local/lib/python2.7/dist-packages/django/db/models/query.py:144: in __len__
    self._fetch_all()
/usr/local/lib/python2.7/dist-packages/django/db/models/query.py:965: in _fetch_all
    self._result_cache = list(self.iterator())
/usr/local/lib/python2.7/dist-packages/django/db/models/query.py:238: in iterator
    results = compiler.execute_sql()
/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py:838: in execute_sql
    cursor = self.connection.cursor()
/usr/local/lib/python2.7/dist-packages/django/db/backends/base/base.py:162: in cursor
    cursor = self.make_debug_cursor(self._cursor())
/usr/local/lib/python2.7/dist-packages/django/db/backends/base/base.py:135: in _cursor
    self.ensure_connection()
E   Failed: Database access not allowed, use the "django_db" mark to enable it.