code: def test_deconcatenate_column_string_no_sep(dataframe):
      with pytest.raises(ValueError):
          df_orig = dataframe.concatenate_columns(
              column_names=["a", "decorated-elephant"],
              sep="-",
              new_column_name="index",
          )
          df = df_orig.deconcatenate_column(  # noqa: F841
              column_name="index", new_column_names=["A", "B"]
          )
  
file_path: pyjanitor/tests/functions/test_deconcatenate_column.py
imports: import pandas
  import pytest
  from pandas.testing import assert_frame_equal
  import janitor
label_desc: Use image node_id 2 for calling a global function with example usage: test_deconcatenate_column_string_no_sep(dataframe) without return types