def METHOD_NAME(self, mock_conn):
    mock_conn = mock_conn()
    self.default_expected_params['task_status'] = 'WAITING'
    mock_conn.hgetall.return_value = self.default_expected_params
    self._simulate_signal()
    args = mock_conn.hmset.call_args[0]
    self.assertEqual(args[1]['task_status'], 'SUCCESS')