self = 
def test_log_empty(self):
    gapic_logger = Config.CLIENT.logger(self._logger_name("log_empty"))
    http_logger = Config.HTTP_CLIENT.logger(self._logger_name("log_empty_http"))

    loggers = (
        [gapic_logger]
        if Config.use_mtls == "always"
        else [gapic_logger, http_logger]
    )
    for logger in loggers:
        self.to_delete.append(logger)

        logger.log()


      entries = _list_entries(logger)


tests/system/test_system.py:510:

tests/system/test_system.py:86: in _list_entries

return outer(logger)

.nox/prerelease_deps-3-8/lib/python3.8/site-packages/test_utils/retry.py:100: in wrapped_function

return to_wrap(*args, **kwargs)

args = (<google.cloud.logging_v2.logger.Logger object at 0x7ffa102a2e80>,)

kwargs = {}, tries = 6, result = [], delay = 64

msg = '_has_entries. Trying again in 64 seconds...'
@functools.wraps(to_wrap)
def wrapped_function(*args, **kwargs):
    tries = 0
    while tries < self.max_tries:
        result = to_wrap(*args, **kwargs)
        if self.result_predicate(result):
            return result

        delay = self.delay * self.backoff ** tries
        msg = "%s. Trying again in %d seconds..." % (
            self.result_predicate.__name__,
            delay,
        )
        self.logger(msg)

        time.sleep(delay)
        tries += 1


  raise BackoffFailed()


E       test_utils.retry.BackoffFailed
.nox/prerelease_deps-3-8/lib/python3.8/site-packages/test_utils/retry.py:170: BackoffFailed