code: def test_serialize_many(self):
      serialized_data = self.serializer_class(
          self.model_class.objects.all(), many=True
      )
      self.assertEqual(len(serialized_data.data), 3)
  
file_path: modelchimp/modelchimp/tests/serializers/test_user_serializer.py
imports: from modelchimp.tests import BaseTest
  from modelchimp.factories.factory_user import UserFactory
  from modelchimp.serializers.user import UserSerializer
  from modelchimp.models.user import User
label_desc: Use image node_id 3 for calling the UserSerializerTest obj's underlying member method code with example usage: obj.test_serialize_many() without return types