code: def testParseToTrials(self):
      trials = self.generate_trials(
          {
              "run": "PPO",
              "num_samples": 2,
              "max_failures": 5,
              "config": {"env": "Pong-v0", "foo": "bar"},
          },
          "tune-pong",
      )
      trials = list(trials)
      self.assertEqual(len(trials), 2)
      self.assertTrue("PPO_Pong-v0" in str(trials[0]))
      self.assertEqual(
          trials[0].config, {"foo": "bar", "env": "Pong-v0"}
      )
      self.assertEqual(trials[0].trainable_name, "PPO")
      self.assertEqual(trials[0].experiment_tag, "0")
      self.assertEqual(trials[0].max_failures, 5)
      self.assertEqual(trials[0].evaluated_params, {})
      self.assertEqual(
          trials[0].local_dir,
          os.path.join(DEFAULT_RESULTS_DIR, "tune-pong"),
      )
      self.assertEqual(trials[1].experiment_tag, "1")
  
imports: import os
  import numpy
  import random
  import unittest
  import ray
  from ray.rllib import _register_all
  from ray import tune
  from ray.tune.result import DEFAULT_RESULTS_DIR
  from ray.tune.search import grid_search, BasicVariantGenerator
  from ray.tune.search.variant_generator import RecursiveDependencyError, _resolve_nested_dict
label_desc: Use image node_id 4 for calling the VariantGeneratorTest obj's underlying member method code with example usage: obj.testParseToTrials() without return types