code: def test_no_device_1(self):
      os.environ["CUDA_VISIBLE_DEVICES"] = " "
      available = _test_cupy_available(self)
      assert not available
  
imports: import operator
  import os
  import shutil
  import subprocess
  import sys
  import tempfile
  import unittest
  from unittest import mock
  import numpy
  import pytest
  import cupy
  import cupyx
label_desc: Use image node_id 3 for calling the TestNotAvailable obj's underlying member method code with example usage: obj.test_no_device_1() without return types