code: def testNonTupleObservationShape(self):
      with self.assertRaises(AssertionError):
          self.observation_shape = 84
          _ = self._create_test_agent()
  
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 8 for calling the DQNAgentTest obj's underlying member method code with example usage: obj.testNonTupleObservationShape() without return types