i work on a celery beat task within a django project which creates Database entries periodically. I know so beacuse when i set the task up like this :
celery.py:
from __future__ import absolute_import, unicode_literals
import os
from celery import Celery
from celery.schedules import crontab
app = Celery("clock-backend", broker=os.environ.get("RABBITMQ_URL"))
app.config_from_object("django.conf:settings", namespace="CELERY")
app.conf.beat_schedule = {
'create_reports_monthly': {
'task': 'project_celery.tasks.create_reports_monthly',
'schedule': 10.0,
},
}
app.autodiscover_tasks()
And start my project it really creates an object every 10 seconds.
But what i really want to do is to set it up to run every first day of a month.
To do so i would change "schedule": crontab(0, 0, day_of_month="1").
Here comes my actual problem : How do i test that this really works ?
And by testing i mean actual (unit)tests.
What I've tried is to work with a package called freezegun. A test with this looks like this :
def test_start_of_month_report_creation(self, user_object, contract_object, report_object):
# set time to the last day of January
with freeze_time("2019-01-31 23:59:59") as frozen_time:
# let one second pass
frozen_time.tick()
# give the celery task some time
time.sleep(20)
# Test Logic to check whether the object was created
# Example: assert MyModel.objects.count() > 0
But this did not work. I suspect that the celery beat does not use the time set via freezgun/python but the real "hardware" clock.
I've also tried setting the Hardwareclock like here but this did not work in my setup.
I'm thankful for any comments, remarks or help on this topic since i'd really like to implement a test for this.
