code: def test_len_colspecs_len_names_with_index_col(
      colspecs, names, widths, index_col, expected
  ):
      # GH#40830
      data = """col1  col2  col3  col4
      bab   ba    2"""
      result = read_fwf(
          StringIO(data),
          colspecs=colspecs,
          names=names,
          widths=widths,
          index_col=index_col,
      )
      tm.assert_frame_equal(result, expected)
  
imports: from datetime import datetime
  from io import BytesIO, StringIO
  from pathlib import Path
  import numpy
  import pytest
  from pandas.errors import EmptyDataError
  import pandas
  from pandas import DataFrame, DatetimeIndex
  import pandas._testing
  from pandas.core.arrays import ArrowStringArray, StringArray
  from pandas.io.common import urlopen
  from pandas.io.parsers import read_csv, read_fwf
label_desc: Use image node_id 36 for calling a global function with example usage: test_len_colspecs_len_names_with_index_col(colspecs, names, widths, index_col, expected) without return types