code: def test_dummy_device(
      self, src_backend_config, current_backend_config
  ):
      x_arr = src_backend_config.get_array(numpy.zeros((2, 3)))
  
      with current_backend_config:
          y = functions.copy(x_arr, cuda.DummyDevice)
  
      # Always transferred to NumPy device, regardless of the current CUDA
      # device.
      assert isinstance(y.device, _cpu.CpuDevice)
  
imports: import unittest
  import numpy
  import pytest
  import chainer
  from chainer import backend
  from chainer.backends import _cpu
  from chainer.backends import cuda
  from chainer import functions
  from chainer import testing
  import chainerx
label_desc: Use image node_id 1 for calling the TestCopyCudaDummyDevice obj's underlying member method code with example usage: obj.test_dummy_device(src_backend_config, current_backend_config) without return types