code: def test_symmetric_difference(self):
      df_result = overlay(
          self.layer_a, self.layer_b, how="symmetric_difference"
      )
      assert_geodataframe_equal(df_result, self.symmetric_difference)
  
imports: import os
  import numpy
  import pandas
  from shapely import make_valid
  from shapely.geometry import Point, Polygon, LineString, GeometryCollection, box
  import geopandas
  from geopandas import GeoDataFrame, GeoSeries, overlay, read_file
  from geopandas._compat import PANDAS_GE_20
  from geopandas.testing import assert_geodataframe_equal, assert_geoseries_equal
  import pytest
label_desc: Use image node_id 6 for calling the TestOverlayWikiExample obj's underlying member method code with example usage: obj.test_symmetric_difference() without return types