code: def test_ensure_file_directory(mkdir, tmpdir):
      a = {"x": 1, "y": {"a": 1}}
  
      source = os.path.join(str(tmpdir), "source.yaml")
      dest = os.path.join(str(tmpdir), "dest")
  
      with open(source, "w") as f:
          yaml.dump(a, f)
  
      if mkdir:
          os.mkdir(dest)
  
      ensure_file(source=source, destination=dest)
  
      assert os.path.isdir(dest)
      assert os.path.exists(os.path.join(dest, "source.yaml"))
  
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 24 for calling a global function with example usage: test_ensure_file_directory(mkdir, tmpdir) without return types