code: def testCreateAgentWithDefaults(self):
      # Verifies that we can create and train an agent with the default values.
      agent = dqn_agent.JaxDQNAgent(num_actions=4)
      observation = onp.ones([84, 84, 1])
      agent.begin_episode(observation)
      agent.step(reward=1, observation=observation)
      agent.end_episode(reward=1)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import shutil
  from absl import flags
  from absl.testing import absltest
  from dopamine.discrete_domains import atari_lib
  from dopamine.jax.agents.dqn import dqn_agent
  from dopamine.utils import test_utils
  from flax import linen
  import gin
  import jax.numpy
  import mock
  import numpy
label_desc: Use image node_id 3 for calling the DQNAgentTest obj's underlying member method code with example usage: obj.testCreateAgentWithDefaults() without return types