code: def test_experiment_addtags(self, experiment, offline_experiment):
      logger = self.loggers["online"]
      logger.log_trial_start(self.trials[0])
      experiment.return_value.add_tags.assert_called_with(logger.tags)
  
imports: import unittest
  from unittest.mock import patch
  from ray.air.integrations.comet import CometLoggerCallback
  from collections import namedtuple
label_desc: Use image node_id 4 for calling the LogTrialStartTest obj's underlying member method code with example usage: obj.test_experiment_addtags(experiment, offline_experiment) without return types