code: def test_clean_names_original_columns(dataframe):
      """Tests clean_names `preserve_original_columns` parameter."""
      df = dataframe.clean_names(preserve_original_labels=True)
      expected_columns = [
          "a",
          "Bell__Chart",
          "decorated-elephant",
          "animals@#$%^",
          "cities",
      ]
      assert set(df.original_labels) == set(expected_columns)
  
file_path: pyjanitor/tests/functions/test_clean_names.py
imports: import pandas
  import pytest
  from janitor.errors import JanitorError
label_desc: Use image node_id 4 for calling a global function with example usage: test_clean_names_original_columns(dataframe) without return types