code: def test_len_colspecs_len_names(colspecs, names, widths, index_col):
      # GH#40830
      data = """col1  col2  col3  col4
      bab   ba    2"""
      msg = "Length of colspecs must match length of names"
      with pytest.raises(ValueError, match=msg):
          read_fwf(
              StringIO(data),
              colspecs=colspecs,
              names=names,
              widths=widths,
              index_col=index_col,
          )
  
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 35 for calling a global function with example usage: test_len_colspecs_len_names(colspecs, names, widths, index_col) without return types