code: def test_from_array(self, backend_config):
      arr = backend_config.get_array(numpy.ndarray((2,), numpy.float32))
      device = backend.CpuDevice.from_array(arr)
      assert device is None
  
imports: import unittest
  import numpy
  from chainer import backend
  from chainer import testing
label_desc: Use image node_id 1 for calling the TestCpuDeviceFromArrayInvalidArray obj's underlying member method code with example usage: obj.test_from_array(backend_config) without return types