code: def test_GeoJSON(self):
      self.assertEqual(None, geojson.GeoJSON().__geo_interface__)
  
      self.assertEqual(
          {"type": "GeoJSON"}, to_mapping(geojson.GeoJSON())
      )
  
file_path: geojson/tests/test_geo_interface.py
imports: import unittest
  import geojson
  from geojson.mapping import to_mapping
label_desc: Use image node_id 8 for calling the EncodingDecodingTest obj's underlying member method code with example usage: obj.test_GeoJSON() without return types