code: def test_sindex(self):
      self.df.crs = "epsg:4326"
      assert self.df.sindex.size == 5
      hits = list(self.df.sindex.intersection((2.5, 2.5, 4, 4)))
      assert len(hits) == 2
      assert hits[0] == 3
  
imports: from math import sqrt
  import numpy
  import pandas
  import pytest
  import shapely
  from numpy.testing import assert_array_equal
  from shapely.geometry import GeometryCollection, LineString, MultiPolygon, Point, Polygon, box
  import geopandas
  from geopandas import GeoDataFrame, GeoSeries, read_file
  from geopandas import _compat
label_desc: Use image node_id 2 for calling the TestFrameSindex obj's underlying member method code with example usage: obj.test_sindex() without return types