Test with Celery task unable to see database commits

[Audace]

Thanks for submitting an issue!

Here's a quick checklist in what to include:

• Include a detailed description of the bug or suggestion
  I'm unable to view database actions in a Celery task from my pytest test function. I imagine it's related to transactions, but can't nail it down despite setting transaction=True in the pytest marker.
• pip list of the virtual environment you are using

amqp (2.2.2)
apipkg (1.4)
attrs (17.4.0)
billiard (3.5.0.3)
celery (4.1.0)
certifi (2017.11.5)
chardet (3.0.4)
cookies (2.2.1)
coverage (4.4.2)
Django (2.0.1)
django-celery-beat (1.1.0)
django-celery-results (1.0.1)
django-fsm (2.6.0)
django-model-utils (3.1.1)
djangorestframework (3.7.7)
ephem (3.7.6.0)
execnet (1.5.0)
factory-boy (2.8.1)
Faker (0.8.8)
flake8 (3.5.0)
graphene (2.0.1)
graphene-django (2.0.0)
graphql-core (2.0)
graphql-relay (0.4.5)
idna (2.6)
inflection (0.3.1)
iso8601 (0.1.12)
kombu (4.1.0)
mccabe (0.6.1)
pep8 (1.7.1)
pip (9.0.1)
pluggy (0.6.0)
promise (2.1)
psycopg2 (2.7.3.2)
py (1.5.2)
pycodestyle (2.3.1)
pyflakes (1.6.0)
pytest (3.3.2)
pytest-cache (1.0)
pytest-cov (2.5.1)
pytest-django (3.1.2)
pytest-env (0.6.2)
pytest-factoryboy (1.3.1)
pytest-flake8 (0.9.1)
pytest-mock (1.6.3)
pytest-pep8 (1.0.6)
python-dateutil (2.6.1)
pytz (2017.3)
redis (2.10.6)
requests (2.18.4)
responses (0.8.1)
Rx (1.6.0)
setuptools (38.4.0)
singledispatch (3.4.0.3)
six (1.11.0)
slackclient (1.1.0)
text-unidecode (1.1)
typing (3.6.2)
urllib3 (1.22)
vine (1.1.4)
websocket-client (0.46.0)
wheel (0.30.0)

• pytest and operating system versions
  • pytest: 3.3.2, OS: Mac OS X
• Minimal example if possible

Sample test

class TestClosingPendingClosedSession:
    @pytest.mark.django_db()
    def test_does_get_closed_with_no_messages(self, settings, session_factory):
        settings.CELERY_TASK_ALWAYS_EAGER = True
        settings.CELERY_TASK_EAGER_PROPAGATES = True

        original_time = datetime.now(pytz.UTC) - timedelta(minutes=31)
        session = session_factory(time_start=original_time)

        session.mark_as_stale()
        session.save()

        session.mark_as_pending_closed()
        session.save()

        # wait 5 seconds
        wait_until(condition=lambda: Session.objects.get(pk=session.id).is_closed,
                   timeout=5)

        assert Session.objects.get(pk=session.id).is_closed

Sample Celery task

@celery_app.task
def close_pending_closed_session(session_id, datetime_of_last_non_bot_message):
    """
    Task that closes session that's been set to PENDING CLOSED
    if there is no new activity for 5 additional minutes.
    """
    session = Session.objects.get(pk=session_id)
    if datetime_of_last_non_bot_message == session.datetime_of_last_non_bot_message:
        session.mark_as_closed()
        session.save()
        print(session.is_closed)

        session.question.mark_as_solved()
        session.question.save()

This is printing True despite the assertion failing.

[pytestbot]

GitMate.io thinks possibly related issues are #2851 (..), and #1980 (.).