Celery: how to test task that schedules itself to run again

I have a celery task that, if a certain condition is not yet reached, schedules itself to run again after a while.

When I test it I use:

@override_settings(CELERY_EAGER_PROPAGATES_EXCEPTIONS=True,
                   CELERY_ALWAYS_EAGER=True,
                   BROKER_BACKEND='memory')

So the task repeatedly schedules itself to run again immediately instead of the date I intended, and it generates an infinite loop and I get the error:

RuntimeError: maximum recursion depth exceeded in cmp

How can I test this task without triggering this error?

Thanks

I don't know if the code from the test is relevant, but here it is:

def create_new_deadline(gig):
     if gig.next_deadline is not None:
         cancel_overdue_gig.apply_async((gig.id,),
                                        eta = gig.next_deadline)

 # cancel gig whose deadline was not met
 @task
 def cancel_overdue_gig(gig_id):
     gig = Gig.objects.get(id=gig_id)
     if gig.next_deadline and gig.next_deadline <= timezone.now():
         gig.status = 12
         gig.next_deadline = None
         gig.cancelation_reason = _(
             'Deadline not met by ') + gig.venue.display_name
         gig.save()
     else:
         create_new_deadline(gig)

Basically I check if there's a deadline and if the deadline has passed. If it hasn't, that means the deadline has been postponed, and I set another check for the next deadline. If it has, I change the status to cancelled and delete the deadline.