code: def test_from_array(self, backend_config):
      arr = backend_config.get_array(numpy.ndarray((2,), numpy.float32))
      # Test precondition check
      assert arr.device.name == backend_config.chainerx_device
  
      expected_device = backend_config.device
  
      # ChainerxDevice.from_array
      device = backend.ChainerxDevice.from_array(arr)
      self.check_device(device, backend_config)
      assert device == expected_device
  
      # backend.get_device_from_array
      device = backend.get_device_from_array(arr)
      self.check_device(device, backend_config)
      assert device == expected_device
  
imports: import unittest
  import numpy
  import chainer
  from chainer import backend
  from chainer.backends import cuda
  from chainer import testing
  from chainer.testing import attr
  import chainerx
label_desc: Use image node_id 3 for calling the TestChainerxDevice obj's underlying member method code with example usage: obj.test_from_array(backend_config) without return types