code: def test_wrong_file_name():
      """Ensure file names are checked when creating a (custom) Dataset."""
      wrong_files = [("does_not_exist", "does_not_either")]
  
      with pytest.raises(ValueError):
          Dataset.load_from_folds(
              folds_files=wrong_files, reader=Reader()
          )
  
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 1 for calling a global function with example usage: test_wrong_file_name() without return types