code: def get_credentials(self) -> Union[Tuple[str], Tuple[str, str]]:
      return "username", ""
  
file_path: redis-py/tests/test_asyncio/test_credentials.py
imports: import functools
  import random
  import string
  from typing import Optional, Tuple, Union
  import pytest
  import pytest_asyncio
  import redis
  from redis import AuthenticationError, DataError, ResponseError
  from redis.credentials import CredentialProvider, UsernamePasswordCredentialProvider
  from redis.utils import str_if_bytes
  from tests.conftest import skip_if_redis_enterprise
label_desc: Use image node_id 1 for calling the NoPassCredProvider obj's underlying member method code with example usage: obj.get_credentials() and returns: str,  str