code: def test_no_devices(self):
      self._register_factory("no_devices", -10, device_count=0)
      with self.assertRaisesRegex(
          RuntimeError,
          "Unable to initialize backend 'no_devices': "
          "Backend 'no_devices' provides no devices.",
      ):
          xb.get_backend("no_devices")
  
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 11 for calling the GetBackendTest obj's underlying member method code with example usage: obj.test_no_devices() without return types