code: def setUp(self):
      # Init VectorEnv to test
      if self.vector_env_to_test == "SerialVectorEnv":
          self.vec_env = chainerrl.envs.SerialVectorEnv(
              [gym.make(self.env_id) for _ in range(self.num_envs)]
          )
      elif self.vector_env_to_test == "MultiprocessVectorEnv":
          self.vec_env = chainerrl.envs.MultiprocessVectorEnv(
              [
                  (lambda: gym.make(self.env_id))
                  for _ in range(self.num_envs)
              ]
          )
      else:
          assert False
      # Init envs to compare against
      self.envs = [gym.make(self.env_id) for _ in range(self.num_envs)]
  
file_path: chainerrl/tests/envs_tests/test_vector_envs.py
imports: import unittest
  from chainer import testing
  import gym
  import numpy
  import chainerrl
label_desc: Use image node_id 1 for calling the TestSerialVectorEnv obj's underlying member method code with example usage: obj.setUp() without return types