code: def test_set_download_dir():
      tmpd = TemporaryDirectory()
      datasets.set_download_dir(tmpd.name)
  
      assert datasets.get_download_dir() == Path(tmpd.name).absolute()
  
      tmpd.cleanup()
  
imports: import os
  import gc
  from pathlib import Path
  from tempfile import TemporaryDirectory
  import pandas
  import pytest
  import cudf
  import dask_cudf
  from cugraph.structure import Graph
  from cugraph.testing import RAPIDS_DATASET_ROOT_DIR_PATH, ALL_DATASETS, WEIGHTED_DATASETS, SMALL_DATASETS, BENCHMARKING_DATASETS
  from cugraph import datasets
  from cugraph.dask.common.mg_utils import is_single_gpu
label_desc: Use image node_id 7 for calling a global function with example usage: test_set_download_dir() without return types