code: def test_get_parallel_devices(devices, tpu_available):
      expected = XLAAccelerator.get_parallel_devices(devices)
      assert len(expected) == devices
  
imports: import pytest
  from lightning.fabric.accelerators.xla import _XLA_AVAILABLE, XLAAccelerator
  from tests_fabric.helpers.runif import RunIf
label_desc: Use image node_id 3 for calling a global function with example usage: test_get_parallel_devices(devices, tpu_available) without return types