code: def test_run(self):
      result = self._run_handler(
          """
              session_name: '/this/is/a/session'
              metric_name: {
                tag: 'metric_tag'
                group: 'metric_group'
              }
              """
      )
      self.assertEqual([(1, 1, 1.0), (2, 2, 2.0), (3, 3, 3.0)], result)
  
file_path: tensorboard/tensorboard/plugins/hparams/list_metric_evals_test.py
imports: from unittest import mock
  import tensorflow
  from google.protobuf import text_format
  from tensorboard import context
  from tensorboard.plugins.hparams import api_pb2
  from tensorboard.plugins.hparams import list_metric_evals
  from tensorboard.plugins.scalar import scalars_plugin
label_desc: Use image node_id 4 for calling the ListMetricEvalsTest obj's underlying member method code with example usage: obj.test_run() without return types