code: def test_fwf_colspecs_infer_nrows(infer_nrows, exp_data):
      # see gh-15138
      data = """\
    1  2
  123 98
  """
      expected = DataFrame(exp_data)
  
      result = read_fwf(
          StringIO(data), infer_nrows=infer_nrows, header=None
      )
      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 12 for calling a global function with example usage: test_fwf_colspecs_infer_nrows(infer_nrows, exp_data) without return types