code: def test_lazy_build(self):
      assert self.df.geometry.values._sindex is None
      assert self.df.sindex.size == 5
      assert self.df.geometry.values._sindex is not None
  
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 3 for calling the TestFrameSindex obj's underlying member method code with example usage: obj.test_lazy_build() without return types