code: def test_pad_backfill_deprecated(func):
      # GH#33396
      df = DataFrame({"a": [1, 2, 3]})
      with tm.assert_produces_warning(FutureWarning):
          getattr(df, func)()
  
imports: import numpy
  import pytest
  from pandas._config import using_pyarrow_string_dtype
  from pandas import Categorical, DataFrame, DatetimeIndex, NaT, PeriodIndex, Series, TimedeltaIndex, Timestamp, date_range, to_datetime
  import pandas._testing
  from pandas.tests.frame.common import _check_mixed_float
label_desc: Use image node_id 3 for calling a global function with example usage: test_pad_backfill_deprecated(func) without return types