code: def test_get_unregistered_class(self):
      class NotRegistered(base.Trackable):
          pass
  
      no_register = NotRegistered
      self.assertIsNone(
          registration.get_registered_class_name(no_register)
      )
  
imports: from absl.testing import parameterized
  from tensorflow.python.eager import test
  from tensorflow.python.saved_model import registration
  from tensorflow.python.trackable import base
label_desc: Use image node_id 3 for calling the SerializableRegistrationTest obj's underlying member method code with example usage: obj.test_get_unregistered_class() without return types