code: def assert_ring(r: Ring, expected: List[GJPoint]):
      assert [[p.lon, p.lat] for p in r.points] == expected
  
file_path: lets-plot/python-package/test/geo_data/test_geojson.py
imports: from typing import List
  from lets_plot.geo_data.gis.geometry import Ring, Polygon, Multipolygon
  from lets_plot.geo_data.gis.json_response import GeoJson
  from geo_data_test_util import multipolygon, polygon, ring, point, format_multipolygon, GJPoint, format_polygon
label_desc: Use image node_id 3 for calling a global function with example usage: assert_ring(r, expected) without return types