code: def test_rename_fields_remove_only():
      # If given field is in the dictionary, and remove_only is True, it will be removed.
      d = {"a": 1, "b": 2}
      rename_fields(d, "a", remove_only=True)
      assert "a" not in d
      rename_fields(d, "b", remove_only=True)
      assert len(d) == 0
  
imports: from __future__ import annotations
  import logging
  from typing import TYPE_CHECKING
  import pytest
  from bentoml._internal.configuration.helpers import expand_env_var_in_values
  from bentoml._internal.configuration.helpers import flatten_dict
  from bentoml._internal.configuration.helpers import is_valid_ip_address
  from bentoml._internal.configuration.helpers import load_config_file
  from bentoml._internal.configuration.helpers import rename_fields
  from bentoml.exceptions import BentoMLConfigException
label_desc: Use image node_id 4 for calling a global function with example usage: test_rename_fields_remove_only() without return types