code: def json(self):
      return self._content
  
imports: import os
  import sys
  import json
  import pytest
  from unittest.mock import patch
  from tempfile import TemporaryDirectory
  from recommenders.tuning.nni.nni_utils import get_experiment_status, check_experiment_status, check_stopped, check_metrics_written, get_trials, NNI_STATUS_URL, NNI_TRIAL_JOBS_URL
label_desc: Use image node_id 2 for calling the MockResponseTrials obj's underlying member method code with example usage: obj.json() and returns: self