code: def test_rename():
      aliases = {
          "foo-bar": "foo.bar",
          "x.y": "foo.y",
          "a.b": "ab",
          "not-found": "not.found",
          "super.old": "super",
      }
      config = {
          "foo_bar": 1,
          "x": {"y": 2, "z": 3},
          "a": {"b": None},
          "super": {"old": 4},
      }
      with pytest.warns(FutureWarning) as w:
          rename(aliases, config=config)
      assert [str(wi.message) for wi in w.list] == [
          "Dask configuration key 'foo-bar' has been deprecated; please use 'foo.bar' instead",
          "Dask configuration key 'x.y' has been deprecated; please use 'foo.y' instead",
          "Dask configuration key 'a.b' has been deprecated; please use 'ab' instead",
          "Dask configuration key 'super.old' has been deprecated; please use 'super' instead",
      ]
      assert config == {
          "foo": {"bar": 1, "y": 2},
          "x": {"z": 3},
          "a": {},
          "ab": None,
          "super": 4,
      }
  
imports: from __future__ import annotations
  import os
  import site
  import stat
  import sys
  from collections import OrderedDict
  from contextlib import contextmanager
  import pytest
  import yaml
  import dask.config
  from dask.config import _get_paths, canonical_name, collect, collect_env, collect_yaml, config, deserialize, ensure_file, expand_environment_variables, get, merge, pop, refresh, rename, serialize, update, update_defaults
  from dask.utils import tmpfile
label_desc: Use image node_id 36 for calling a global function with example usage: test_rename() without return types