code: def testSerialization(self):
      """Tests if the class is able to generate serialized strings."""
      original_topology = topology.Topology(
          mesh_shape=[1, 1, 1, 2],
          device_coordinates=[[[0, 0, 0, 0], [0, 0, 0, 1]]],
      )
      serialized_str = original_topology.serialized()
      new_topology = topology.Topology(serialized=serialized_str)
  
      # Make sure the topology recovered from serialized str is same as the
      # original topology.
      self.assertAllEqual(
          original_topology.mesh_shape, new_topology.mesh_shape
      )
      self.assertAllEqual(
          original_topology.device_coordinates,
          new_topology.device_coordinates,
      )
  
imports: from tensorflow.python.platform import test
  from tensorflow.python.tpu import topology
label_desc: Use image node_id 1 for calling the TopologyTest obj's underlying member method code with example usage: obj.testSerialization() without return types