class_docstr: Tests for member functions of the class xla_sharding.Sharding.
code: def test_sharding_is_default_constructable(self):
      sharding = xla_sharding.Sharding()
      self.assertIsNotNone(sharding)
  
imports: from absl.testing import absltest
  import numpy
  from google.protobuf.message import DecodeError
  from local_xla.xla import xla_data_pb2
  from tensorflow.python.compiler.xla.experimental import xla_sharding
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
label_desc: Use image node_id 1 for calling the ShardingTest obj's underlying member method code with example usage: obj.test_sharding_is_default_constructable() without return types