code: def run(self, trial: BaseTrial):
      return {"metadatum": f"value_for_trial_{trial.index}"}
  
file_path: Ax/ax/core/tests/test_runner.py
imports: from unittest import mock
  from ax.core.base_trial import BaseTrial
  from ax.core.runner import Runner
  from ax.utils.common.testutils import TestCase
  from ax.utils.testing.core_stubs import get_batch_trial, get_trial
label_desc: Use image node_id 1 for calling the DummyRunner obj's underlying member method code with example usage: obj.run(trial) and returns: dict