code: def test_get_dataset_dir():
      """Test the get_dataset_dir() function."""
  
      os.environ["SURPRISE_DATA_FOLDER"] = "/tmp/surprise_data"
      assert get_dataset_dir() == "/tmp/surprise_data"
  
      # Fall back to default
      del os.environ["SURPRISE_DATA_FOLDER"]
      assert get_dataset_dir() == os.path.expanduser(
          "~" + "/.surprise_data/"
      )
  
file_path: Surprise/tests/test_dataset.py
imports: import os
  import random
  import pandas
  import pytest
  from surprise import BaselineOnly, Dataset, Reader
  from surprise.builtin_datasets import get_dataset_dir
  from surprise.model_selection import KFold, PredefinedKFold
label_desc: Use image node_id 6 for calling a global function with example usage: test_get_dataset_dir() without return types