code: def test_fillna_series_method(self, data_missing, fillna_method):
      fill_value = data_missing[1]
  
      if fillna_method == "ffill":
          data_missing = data_missing[::-1]
  
      result = getattr(pd.Series(data_missing), fillna_method)()
      expected = pd.Series(
          data_missing._from_sequence(
              [fill_value, fill_value], dtype=data_missing.dtype
          )
      )
  
      tm.assert_series_equal(result, expected)
  
file_path: pandas/pandas/tests/extension/base/missing.py
imports: import numpy
  import pytest
  import pandas
  import pandas._testing
label_desc: Use image node_id 12 for calling the BaseMissingTests obj's underlying member method code with example usage: obj.test_fillna_series_method(data_missing, fillna_method) without return types