def METHOD_NAME():
    challenge = ChallengeFactory()
    participants_group = challenge.participants_group
    admins_group = challenge.admins_group
    assert participants_group
    assert admins_group
    challenge.page_set.all().delete()
    challenge.phase_set.all().delete()
    Challenge.objects.filter(pk__in=[challenge.pk]).delete()
    with pytest.raises(ObjectDoesNotExist):
        participants_group.refresh_from_db()
    with pytest.raises(ObjectDoesNotExist):
        admins_group.refresh_from_db()