code: def testEmptySpec(self, dtype):
      self.assertEqual((), tensor_spec.zero_spec_nest(()))
      self.assertEqual([], tensor_spec.zero_spec_nest([]))
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tf_agents.specs import array_spec
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import time_step
label_desc: Use image node_id 5 for calling the TensorSpecZeroTest obj's underlying member method code with example usage: obj.testEmptySpec(dtype) without return types