code: def test_experimental_warning(self):
      self._register_factory("platform_A", 20, experimental=True)
  
      with self.assertLogs(
          "jax._src.xla_bridge", level="WARNING"
      ) as logs:
          _ = xb.get_backend()
      self.assertIn(
          "WARNING:jax._src.xla_bridge:Platform 'platform_A' is experimental and "
          "not all JAX functionality may be correctly supported!",
          logs.output,
      )
  
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 15 for calling the GetBackendTest obj's underlying member method code with example usage: obj.test_experimental_warning() without return types