code: def test_copy_works(self):
      input_spec = tf.TensorSpec([], tf.float32, "inputs")
      state_spec = tf.TensorSpec([], tf.float32, "state")
      network1 = MockStateFullNetwork(input_spec, state_spec)
      network2 = network1.copy()
  
      self.assertNotEqual(network1, network2)
      self.assertEqual(
          network1.input_tensor_spec, network2.input_tensor_spec
      )
      self.assertEqual(network1.state_spec, network2.state_spec)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import tensorflow
  import tensorflow_probability
  from tf_agents import specs
  from tf_agents.distributions import utils
  from tf_agents.keras_layers import rnn_wrapper
  from tf_agents.networks import network
  from tf_agents.utils import common
label_desc: Use image node_id 4 for calling the StateFullNetworkTest obj's underlying member method code with example usage: obj.test_copy_works() without return types