code: def test_header_delim_whitespace(all_parsers):
      # GH#54918
      parser = all_parsers
      data = """a,b
  1,2
  3,4
      """
  
      depr_msg = (
          "The 'delim_whitespace' keyword in pd.read_csv is deprecated"
      )
      with tm.assert_produces_warning(
          FutureWarning, match=depr_msg, check_stacklevel=False
      ):
          result = parser.read_csv(
              StringIO(data), delim_whitespace=True
          )
      expected = DataFrame({"a,b": ["1,2", "3,4"]})
      tm.assert_frame_equal(result, expected)
  
imports: from collections import namedtuple
  from io import StringIO
  import numpy
  import pytest
  from pandas.errors import ParserError
  from pandas import DataFrame, Index, MultiIndex
  import pandas._testing
label_desc: Use image node_id 31 for calling a global function with example usage: test_header_delim_whitespace(all_parsers) without return types