code: def test_operators_na_handling(self):
      ser = Series(["foo", "bar", "baz", np.nan])
      result = "prefix_" + ser
      expected = Series(
          ["prefix_foo", "prefix_bar", "prefix_baz", np.nan]
      )
      tm.assert_series_equal(result, expected)
  
      result = ser + "_suffix"
      expected = Series(
          ["foo_suffix", "bar_suffix", "baz_suffix", np.nan]
      )
      tm.assert_series_equal(result, expected)
  
imports: import datetime
  from decimal import Decimal
  import operator
  import numpy
  import pytest
  from pandas._config import using_pyarrow_string_dtype
  import pandas.util._test_decorators
  import pandas
  from pandas import Series, Timestamp, option_context
  import pandas._testing
  from pandas.core import ops
label_desc: Use image node_id 8 for calling the TestArithmetic obj's underlying member method code with example usage: obj.test_operators_na_handling() without return types