code: def test_listify_dataset(train_env: TrainEnv, listify_dataset):
      for dataset in train_env.datasets.values():
          if listify_dataset == "yes":
              assert isinstance(dataset, list)
  
imports: import json
  import logging
  import sys
  from typing import ContextManager
  import numpy
  import pytest
  from gluonts.core.component import equals
  from gluonts.dataset.jsonl import encode_json
  from gluonts.model.trivial.mean import MeanPredictor
  from gluonts.shell.env import ServeEnv, TrainEnv
  from gluonts.shell.train import run_train_and_test
label_desc: Use image node_id 5 for calling a global function with example usage: test_listify_dataset(train_env, listify_dataset) without return types