code: def test_serialize_many(self):
      serialized_data = self.serializer_class(
          self.model_class.objects.all(), many=True
      )
      self.assertEqual(len(serialized_data.data), 2)
  
imports: from modelchimp.tests import BaseTest
  from modelchimp.serializers.experiment import ExperimentSerializer
  from modelchimp.models.experiment import Experiment
label_desc: Use image node_id 3 for calling the ExperimentSerializerTest obj's underlying member method code with example usage: obj.test_serialize_many() without return types