code: def test_fillna_nonscalar(self):
      # GH#5703
      s1 = Series([np.nan])
      s2 = Series([1])
      result = s1.fillna(s2)
      expected = Series([1.0])
      tm.assert_series_equal(result, expected)
      result = s1.fillna({})
      tm.assert_series_equal(result, s1)
      result = s1.fillna(Series((), dtype=object))
      tm.assert_series_equal(result, s1)
      result = s2.fillna(s1)
      tm.assert_series_equal(result, s2)
      result = s1.fillna({0: 1})
      tm.assert_series_equal(result, expected)
      result = s1.fillna({1: 1})
      tm.assert_series_equal(result, Series([np.nan]))
      result = s1.fillna({0: 1, 1: 1})
      tm.assert_series_equal(result, expected)
      result = s1.fillna(Series({0: 1, 1: 1}))
      tm.assert_series_equal(result, expected)
      result = s1.fillna(Series({0: 1, 1: 1}, index=[4, 5]))
      tm.assert_series_equal(result, s1)
  
imports: from datetime import datetime, timedelta, timezone
  import numpy
  import pytest
  import pytz
  from pandas import Categorical, DataFrame, DatetimeIndex, NaT, Period, Series, Timedelta, Timestamp, date_range, isna, timedelta_range
  import pandas._testing
  from pandas.core.arrays import period_array
label_desc: Use image node_id 4 for calling the TestSeriesFillNA obj's underlying member method code with example usage: obj.test_fillna_nonscalar() without return types