code: def test_assert_input_spec(self):
      spec = specs.TensorSpec([], tf.int32, "action")
      net = MockNetwork(spec, 1)
      with self.assertRaises(ValueError):
          net((1, 2), 2)
  
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 NetworkTest obj's underlying member method code with example usage: obj.test_assert_input_spec() without return types