code: def test_deconcatenate_column_string(dataframe):
      df_orig = dataframe.concatenate_columns(
          column_names=["a", "decorated-elephant"],
          sep="-",
          new_column_name="index",
      )
      df = df_orig.deconcatenate_column(
          column_name="index", new_column_names=["A", "B"], sep="-"
      )
      assert "A" in df.columns
      assert "B" in df.columns
  
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 3 for calling a global function with example usage: test_deconcatenate_column_string(dataframe) without return types