code: def test_from_pointer(self):
      assert cuda.device.from_pointer(cupy.empty(1).data.ptr).id == 0
  
imports: import re
  import threading
  import unittest
  import pytest
  import cupy
  from cupy import cuda
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestDeviceFromPointer obj's underlying member method code with example usage: obj.test_from_pointer() without return types