code: def test_full_file():
      # File with all values.
      test = """index                             A    B    C
  2000-01-03T00:00:00  0.980268513777    3  foo
  2000-01-04T00:00:00  1.04791624281    -4  bar
  2000-01-05T00:00:00  0.498580885705   73  baz
  2000-01-06T00:00:00  1.12020151869     1  foo
  2000-01-07T00:00:00  0.487094399463    0  bar
  2000-01-10T00:00:00  0.836648671666    2  baz
  2000-01-11T00:00:00  0.157160753327   34  foo"""
      colspecs = ((0, 19), (21, 35), (38, 40), (42, 45))
      expected = read_fwf(StringIO(test), colspecs=colspecs)
  
      result = read_fwf(StringIO(test))
      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 19 for calling a global function with example usage: test_full_file() without return types