code: def test_init_from_env_no_dup(self) -> None:
      self._test_launch_worker(2, init_pg_explicit=False)
      # trivial test case to ensure test passes with no exceptions
      self.assertTrue(True)
  
imports: import os
  import unittest
  import numpy
  import torch
  import torch.distributed.launcher
  from torchtnt.utils.device import get_device_from_env
  from torchtnt.utils.distributed import get_process_group_backend_from_device
  from torchtnt.utils.env import init_from_env, seed
  from torchtnt.utils.test_utils import get_pet_launch_config
label_desc: Use image node_id 4 for calling the EnvTest obj's underlying member method code with example usage: obj.test_init_from_env_no_dup() without return types