code: def test_clean_names_enforce_string(dataframe):
      """Tests clean_names `enforce_string` parameter."""
      df = dataframe.rename(columns={"a": 1}).clean_names(
          enforce_string=True
      )
      for c in df.columns:
          assert isinstance(c, str)
  
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 12 for calling a global function with example usage: test_clean_names_enforce_string(dataframe) without return types