code: def check_copy(self, dtype, src_id, dst_id):
      with cuda.Device(src_id):
          src = testing.shaped_arange((2, 3, 4), dtype=dtype)
      with cuda.Device(dst_id):
          dst = cupy.empty((2, 3, 4), dtype=dtype)
      _core.elementwise_copy(src, dst)
      testing.assert_allclose(src, dst)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import _core
  from cupy import cuda
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestElementwise obj's underlying member method code with example usage: obj.check_copy(dtype, src_id, dst_id) without return types