code: def test_flatten_list():
      nested_lists = [[1, 2], [3], [4, [5, 6]]]
      assert flatten_list(nested_lists) == [1, 2, 3, 4, 5, 6]
  
file_path: H2O/h2o_hf/helm/src/helm/common/test_general.py
imports: import shutil
  import os
  from helm.common.general import ensure_file_downloaded, format_tags, flatten_list, format_split, get_file_name, unique_simplification
label_desc: Use image node_id 3 for calling a global function with example usage: test_flatten_list() without return types