code: def test_get_set_state(self):
      env_class = make_multi_agent("CartPole-v0")
      env = env_class({"num_agents": 2})
  
      module = DiscreteBCTorchModule(
          config=RLModuleConfig(
              env.observation_space,
              env.action_space,
              model_config_dict={"fcnet_hiddens": [32]},
          )
      ).as_multi_agent()
  
      state = module.get_state()
      self.assertIsInstance(state, dict)
      self.assertEqual(set(state.keys()), set(module.keys()))
      self.assertEqual(
          set(state[DEFAULT_POLICY_ID].keys()),
          set(module[DEFAULT_POLICY_ID].get_state().keys()),
      )
  
      module2 = DiscreteBCTorchModule(
          config=RLModuleConfig(
              env.observation_space,
              env.action_space,
              model_config_dict={"fcnet_hiddens": [32]},
          )
      ).as_multi_agent()
      state2 = module2.get_state()
      check(state, state2, false=True)
  
      module2.set_state(state)
      state2_after = module2.get_state()
      check(state, state2_after)
  
file_path: ray/rllib/core/rl_module/tests/test_marl_module.py
imports: import tempfile
  import unittest
  from ray.rllib.core.rl_module.rl_module import SingleAgentRLModuleSpec, RLModuleConfig
  from ray.rllib.core.rl_module.marl_module import MultiAgentRLModule, MultiAgentRLModuleConfig
  from ray.rllib.core.testing.torch.bc_module import DiscreteBCTorchModule
  from ray.rllib.core.testing.utils import DEFAULT_POLICY_ID
  from ray.rllib.env.multi_agent_env import make_multi_agent
  from ray.rllib.utils.test_utils import check
label_desc: Use image node_id 3 for calling the TestMARLModule obj's underlying member method code with example usage: obj.test_get_set_state() without return types