code: def test_list_trials_empty(sagemaker_session):
      sagemaker_session.sagemaker_client.list_trials.return_value = {
          "TrialSummaries": []
      }
      experiment_obj = experiment.Experiment(
          sagemaker_session=sagemaker_session
      )
      assert list(experiment_obj.list_trials()) == []
  
imports: from __future__ import absolute_import
  import botocore.exceptions
  import pytest
  import unittest.mock
  import datetime
  from unittest.mock import patch
  from sagemaker import Session
  from sagemaker.experiments import experiment
  from sagemaker.experiments._api_types import TrialSummary
label_desc: Use image node_id 9 for calling a global function with example usage: test_list_trials_empty(sagemaker_session) without return types