code: def test_rsplit_to_dataframe_expand_no_splits(any_string_dtype):
      s = Series(["nosplit", "alsonosplit"], dtype=any_string_dtype)
      result = s.str.rsplit("_", expand=True)
      exp = DataFrame(
          {0: Series(["nosplit", "alsonosplit"])},
          dtype=any_string_dtype,
      )
      tm.assert_frame_equal(result, exp)
  
imports: from datetime import datetime
  import re
  import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Index, MultiIndex, Series, _testing
  from pandas.tests.strings import _convert_na_value, object_pyarrow_numpy
label_desc: Use image node_id 22 for calling a global function with example usage: test_rsplit_to_dataframe_expand_no_splits(any_string_dtype) without return types