code: def testExportFormats(self):
      class train_fn(Trainable):
          def step(self):
              return {"timesteps_this_iter": 1, "done": True}
  
          def _export_model(self, export_formats, export_dir):
              path = os.path.join(export_dir, "exported")
              with open(path, "w") as f:
                  f.write("OK")
              return {export_formats[0]: path}
  
      trials = run_experiments(
          {"foo": {"run": train_fn, "export_formats": ["format"]}}
      )
      for trial in trials:
          self.assertEqual(trial.status, Trial.TERMINATED)
          self.assertTrue(
              os.path.exists(os.path.join(trial.local_path, "exported"))
          )
  
imports: import os
  import unittest
  import ray
  import ray.train
  from ray.train import CheckpointConfig
  from ray.rllib import _register_all
  from ray.tune.result import TIMESTEPS_TOTAL
  from ray.tune import Trainable, TuneError
  from ray.tune import register_trainable, run_experiments
  from ray.tune.logger import LegacyLoggerCallback, Logger
  from ray.tune.experiment import Experiment
  from ray.tune.experiment.trial import Trial, ExportFormat
label_desc: Use image node_id 8 for calling the RunExperimentTest obj's underlying member method code with example usage: obj.testExportFormats() and returns: dict, dict