django - Django:テスト中にログファイル変数をどのようにオーバーライドしますか?

Question

開発で使用するログファイルとは異なるログファイルをテスト スイートで作成しようとしていますが、何らかの理由で override_settings デコレータが機能していないようです。テストを実行すると、同じ「project/project/debug_logfile」が書き込まれます。私はどこを台無しにしていますか？

# settings.py
...
LOGFILE = ROOT + '/debug_logfile'

LOGGING = {
    'version': 1,
    'disable_existing_loggers': True,
    'formatters': {
        'verbose': {
            'format': '%(levelname)s %(asctime)s %(module)s %(process)d %(thread)d %(message)s'
        },
        'simple': {
            'format': '%(levelname)s %(message)s'
        },
        'standard': {
             'format' : "[%(asctime)s] %(levelname)s [%(name)s:%(lineno)s] %(message)s",
             'datefmt' : "%d/%b/%Y %H:%M:%S"
        },
    },
    'filters': {
        'require_debug_false': {
            '()': 'django.utils.log.RequireDebugFalse'
        }
    },
    'handlers': {
        'null': {
            'level': 'DEBUG',
            'class': 'django.utils.log.NullHandler',
        },
        'console': {
            'level': 'DEBUG',
            'class': 'logging.StreamHandler',
            'formatter': 'simple'
        },
        'mail_admins': {
            'level': 'ERROR',
            'class': 'django.utils.log.AdminEmailHandler',
            'filters': ['require_debug_false']
        },
        'logfile': {
            'level':'DEBUG',
            'class':'logging.handlers.RotatingFileHandler',
            'filename': LOGFILE,
            'maxBytes': 50000,
            'backupCount': 2,
            'formatter': 'standard',
        },
    },
    'loggers': {
        'django': {
            'handlers': ['null'],
            'propagate': True,
            'level': 'INFO',
        },
        'django.request': {
            'handlers': ['mail_admins'],
            'level': 'ERROR',
            'propagate': False,
        },
        'clients': {
            'handlers': ['console', 'logfile'],
            'level': 'DEBUG',
        },
        # display the db queries
        #'django.db.backends': {
        #    'handlers': ['console'],
        #    'level': 'DEBUG',
        #}
    }
}

# clients.management.commands.remindmanagers.py

class Command(BaseCommand):
    help = 'Creates task reminders and send emails to account and senior \
            managers when their client\'s contracts are about to expire'

    def handle(self, *args, **kwargs):
        three_months = datetime.date.today() + datetime.timedelta(days=90)
        # get all contracts that will be completed in the next 3 months
        contracts = Contract.objects.filter(finish__lte=three_months
                                   ).exclude(notices_left=0)

        if not contracts.exists():
            log.info('Tried running but there are no contracts about to expire.')
            return 0
        ...

# tests.test_clients

...
from django.core.management import call_command

@override_settings(LOGFILE=settings.ROOT + "/test_logfile")
class ClientCommandTest(BaseTestCase):
    def _file_exists(file_path):
        return os.path.exists(file_path)

    def test_remindmanagers_no_contracts(self):
        args = []
        kwargs = {}
        #self.assertFalse()
        # since there are no contracts yet, this should create an entry in ROOT + /logfile
        call_command('remindmanagers', *args, **kwargs)                                      # this should log in project/project/test_logfile not debug_logfile