code: def test_local_devices(self):
      self.assertNotEmpty(xb.local_devices())
      with self.assertRaisesRegex(
          ValueError, "Unknown process_index 100"
      ):
          xb.local_devices(100)
      with self.assertRaisesRegex(RuntimeError, "Unknown backend foo"):
          xb.local_devices(backend="foo")
  
imports: import os
  import platform
  import time
  import warnings
  from absl import logging
  from absl.testing import absltest
  from jax._src import compiler
  from jax._src import config
  from jax._src import test_util
  from jax._src import xla_bridge
  from jax._src.interpreters import xla
  from jax._src.lib import xla_client
label_desc: Use image node_id 8 for calling the XlaBridgeTest obj's underlying member method code with example usage: obj.test_local_devices() without return types