code: def test_set_tpu_visible_ids_and_bounds(tpu_chips):
      with patch.dict("os.environ", {}, clear=True):
          TPUAcceleratorManager.set_current_process_visible_accelerator_ids(
              tpu_chips
          )
          if len(tpu_chips) == 1:
              assert (
                  os.environ[tpu.TPU_CHIPS_PER_HOST_BOUNDS_ENV_VAR]
                  == tpu.TPU_CHIPS_PER_HOST_BOUNDS_1_CHIP_CONFIG
              )
              assert (
                  os.environ[tpu.TPU_HOST_BOUNDS_ENV_VAR]
                  == tpu.TPU_SINGLE_HOST_BOUNDS
              )
              assert os.environ[
                  tpu.TPU_VISIBLE_CHIPS_ENV_VAR
              ] == ",".join(tpu_chips)
          elif len(tpu_chips) == 2:
              assert (
                  os.environ[tpu.TPU_CHIPS_PER_HOST_BOUNDS_ENV_VAR]
                  == tpu.TPU_CHIPS_PER_HOST_BOUNDS_2_CHIP_CONFIG
              )
              assert (
                  os.environ[tpu.TPU_HOST_BOUNDS_ENV_VAR]
                  == tpu.TPU_SINGLE_HOST_BOUNDS
              )
              assert os.environ[
                  tpu.TPU_VISIBLE_CHIPS_ENV_VAR
              ] == ",".join(tpu_chips)
          else:  # len(tpu_chips) == 4
              # Check that nothing is set, let the ML framework use the defaults.
              assert (
                  os.environ.get(
                      tpu.TPU_CHIPS_PER_HOST_BOUNDS_ENV_VAR, None
                  )
                  is None
              )
              assert (
                  os.environ.get(tpu.TPU_SINGLE_HOST_BOUNDS, None)
                  is None
              )
              assert (
                  os.environ.get(tpu.TPU_VISIBLE_CHIPS_ENV_VAR, None)
                  is None
              )
  
imports: import os
  import sys
  import mock
  import pytest
  import requests
  from unittest.mock import patch
  import ray
  from ray._private.accelerators import TPUAcceleratorManager
  from ray._private.accelerators import tpu
label_desc: Use image node_id 10 for calling a global function with example usage: test_set_tpu_visible_ids_and_bounds(tpu_chips) without return types