old_contents: #!/usr/bin/env python
  #
  # Copyright (c) Facebook, Inc. and its affiliates.
  import multiprocessing as mp
  
  import gym
  import pytest
  
  import minihack  # noqa: F401
  
  START_METHODS = [
      # TODO uncomment spawn after the next NLE release
      # m for m in ("fork", "spawn") if m in mp.get_all_start_methods()
      m
      for m in ("fork")
      if m in mp.get_all_start_methods()
  ]
  
  
  def new_env_one_step():
      env = gym.make("MiniHack-Room-15x15-v0")
      env.reset()
      obs, reward, done, _ = env.step(0)
      return done
  
  
  @pytest.mark.parametrize(
      "ctx", [mp.get_context(m) for m in START_METHODS], ids=START_METHODS
  )
  class TestEnvSubprocess:
      def test_env_in_subprocess(self, ctx):
          p = ctx.Process(target=new_env_one_step)
          p.start()
          p.join()
          assert p.exitcode == 0
  
      def test_env_before_and_in_subprocess(self, ctx):
          new_env_one_step()
          p = ctx.Process(target=new_env_one_step)
          p.start()
          p.join()
          assert p.exitcode == 0
  
new_contents: #!/usr/bin/env python
  #
  # Copyright (c) Facebook, Inc. and its affiliates.
  import multiprocessing as mp
  
  import gym
  import pytest
  
  import minihack  # noqa: F401
  
  START_METHODS = [
      m
      for m in ("fork", "spawn")
      if m in mp.get_all_start_methods()
  ]
  
  
  def new_env_one_step():
      env = gym.make("MiniHack-Room-15x15-v0")
      env.reset()
      obs, reward, done, _ = env.step(0)
      return done
  
  
  @pytest.mark.parametrize(
      "ctx", [mp.get_context(m) for m in START_METHODS], ids=START_METHODS
  )
  class TestEnvSubprocess:
      def test_env_in_subprocess(self, ctx):
          p = ctx.Process(target=new_env_one_step)
          p.start()
          p.join()
          assert p.exitcode == 0
  
      def test_env_before_and_in_subprocess(self, ctx):
          new_env_one_step()
          p = ctx.Process(target=new_env_one_step)
          p.start()
          p.join()
          assert p.exitcode == 0
  
subject: Update test_system.py