code: def test_invalid_cleaning_style(currency_df):
      """Ensures a ValueError is thrown if an invalid cleaning style is passed
      in."""
      with pytest.raises(ValueError):
          currency_df.currency_column_to_numeric(
              "a_col", cleaning_style="foobar"
          )
  
file_path: pyjanitor/tests/functions/test_currency_column_to_numeric.py
imports: import numpy
  import pandas
  import pytest
  from pandas.testing import assert_frame_equal
  from janitor.functions.currency_column_to_numeric import _currency_column_to_numeric
label_desc: Use image node_id 2 for calling a global function with example usage: test_invalid_cleaning_style(currency_df) without return types