code: def test_null_geometry_explicit(self):
      feature = geojson.Feature(
          id=12, geometry=None, properties={"foo": "bar"}
      )
      actual = geojson.dumps(feature, sort_keys=True)
      expected = (
          '{"geometry": null, "id": 12, "properties": {"foo": '
          '"bar"}, "type": "Feature"}'
      )
      self.assertEqual(actual, expected)
  
imports: import unittest
  import geojson
label_desc: Use image node_id 1 for calling the NullGeometriesTest obj's underlying member method code with example usage: obj.test_null_geometry_explicit() without return types