code: def test_isna_for_inf(self):
      s = Series(["a", np.inf, np.nan, pd.NA, 1.0])
      msg = "use_inf_as_na option is deprecated"
      with tm.assert_produces_warning(FutureWarning, match=msg):
          with pd.option_context("mode.use_inf_as_na", True):
              r = s.isna()
              dr = s.dropna()
      e = Series([False, True, True, True, False])
      de = Series(["a", 1.0], index=[0, 4])
      tm.assert_series_equal(r, e)
      tm.assert_series_equal(dr, de)
  
file_path: pandas/pandas/tests/series/test_missing.py
imports: from datetime import timedelta
  import numpy
  import pytest
  from pandas._libs import iNaT
  import pandas
  from pandas import Categorical, Index, NaT, Series, isna
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestSeriesMissingData obj's underlying member method code with example usage: obj.test_isna_for_inf() without return types