code: def test_smaller_envelope():
      mp = MultiPoint(points=[(0.5, 0.5), (1.0, 1.0)])
      poly = load_wkt("POLYGON ((0 0, 0.5 0, 0.5 0.5, 0 0.5, 0 0))")
  
      regions = voronoi_diagram(mp, envelope=poly)
  
      assert len(regions.geoms) == 2
      assert sum(r.area for r in regions.geoms) > poly.area
  
file_path: shapely/shapely/tests/legacy/test_voronoi_diagram.py
imports: import numpy
  import pytest
  from shapely.geometry import MultiPoint
  from shapely.ops import voronoi_diagram
  from shapely.wkt import loads
label_desc: Use image node_id 4 for calling a global function with example usage: test_smaller_envelope() without return types