code: def test_default_config(self):
      # the default config is used when no custom config is provided
      config = self.batch_waiters.default_config
      assert config == self.batch_waiters.waiter_config
  
      assert isinstance(config, dict)
      assert config["version"] == 2
      assert isinstance(config["waiters"], dict)
  
      waiters = list(sorted(config["waiters"].keys()))
      assert waiters == ["JobComplete", "JobExists", "JobRunning"]
  
imports: from __future__ import annotations
  import inspect
  import itertools
  import time
  from unittest import mock
  import boto3
  import pytest
  from botocore.exceptions import ClientError, WaiterError
  from botocore.waiter import SingleWaiterConfig, WaiterModel
  from moto import mock_batch
  from airflow.exceptions import AirflowException
  from airflow.providers.amazon.aws.hooks.batch_waiters import BatchWaitersHook
  from airflow.providers.amazon.aws.utils.task_log_fetcher import AwsTaskLogFetcher
label_desc: Use image node_id 2 for calling the TestBatchWaiters obj's underlying member method code with example usage: obj.test_default_config() without return types