code: def test_update(self):
      instance = self.model_class.objects.get(
          experiment_id=self.experiment1.experiment_id
      )
      instance.name = "Heisenberg"
      instance.parameters = {
          "parameter1": "a",
          "parameter2": "b",
          "parameter3": "c",
      }
      instance.save()
  
      self.assertEqual(instance.name, "Heisenberg")
      self.assertEqual(instance.parameters["parameter1"], "a")
  
      instance.parameters["parameter1"] = "aa"
      instance.save()
      self.assertEqual(instance.parameters["parameter1"], "aa")
  
file_path: modelchimp/modelchimp/tests/models/test_experiment_model.py
imports: from modelchimp.tests import BaseTest
  from modelchimp.factories.factory_experiment import ExperimentFactory
  from modelchimp.models.experiment import Experiment
label_desc: Use image node_id 4 for calling the ExperimentModelTest obj's underlying member method code with example usage: obj.test_update() without return types