code: def test_fillna_series(s):
      # fill na with another GeoSeries
      s2 = GeoSeries([Point(0, 0), None, Point(2, 2)])
  
      # check na filled with the same index
      res = s2.fillna(GeoSeries([Point(1, 1)] * 3))
      assert_geoseries_equal(res, s)
  
      # check na filled based on index, not position
      index = [3, 2, 1]
      res = s2.fillna(
          GeoSeries([Point(i, i) for i in index], index=index)
      )
      assert_geoseries_equal(res, s)
  
      # check na filled but the input length is different
      res = s2.fillna(GeoSeries([Point(1, 1)], index=[1]))
      assert_geoseries_equal(res, s)
  
      # check na filled but the inputting index is different
      res = s2.fillna(GeoSeries([Point(1, 1)], index=[9]))
      assert_geoseries_equal(res, s2)
  
imports: import os
  from packaging.version import Version
  import warnings
  import numpy
  from numpy.testing import assert_array_equal
  import pandas
  import shapely
  from shapely.geometry import Point, GeometryCollection, LineString, LinearRing
  import geopandas
  from geopandas import GeoDataFrame, GeoSeries
  import geopandas._compat
  from geopandas.array import from_shapely
  from geopandas.testing import assert_geodataframe_equal, assert_geoseries_equal
  from pandas.testing import assert_frame_equal, assert_series_equal
  import pytest
label_desc: Use image node_id 23 for calling a global function with example usage: test_fillna_series(s) without return types