code: def test_thread(self):
      x = testing.shaped_arange((3, 3), cupy, cupy.int64)
      y = testing.shaped_arange((3, 3), cupy, cupy.int64)
      out = [None]
  
      @cupy.fuse()
      def f(x, y):
          return x + y * 2
  
      def _target(x, y):
          cupy.cuda.Device(0).use()
          out[0] = f(x, y)
  
      t = threading.Thread(target=_target, args=(x, y))
      t.daemon = True
      t.start()
      t.join()
      assert (out[0] == f(x, y)).all()
  
imports: import threading
  import unittest
  from unittest import mock
  import pytest
  import cupy
  from cupy import testing
  from cupy_tests.core_tests.fusion_tests import fusion_utils
label_desc: Use image node_id 1 for calling the TestFusionThread obj's underlying member method code with example usage: obj.test_thread() and returns: unknown