code: def test_get_shapely_multipolygon(self):
      coco_segmentation = [[1, 1, 325, 125, 250, 200, 5, 200]]
      shapely_multipolygon = get_shapely_multipolygon(coco_segmentation)
  
      self.assertListEqual(
          shapely_multipolygon.geoms[0].exterior.coords.xy[0].tolist(),
          [1.0, 325, 250, 5, 1],
      )
      self.assertEqual(shapely_multipolygon.area, 41177.5)
      self.assertTupleEqual(
          shapely_multipolygon.bounds, (1, 1, 325, 200)
      )
  
file_path: sahi/tests/test_shapelyutils.py
imports: import unittest
  from sahi.utils.shapely import MultiPolygon, ShapelyAnnotation, get_shapely_box, get_shapely_multipolygon
label_desc: Use image node_id 2 for calling the TestShapelyUtils obj's underlying member method code with example usage: obj.test_get_shapely_multipolygon() without return types