code: def setUp(self):
      self.x = numpy.arange(6, dtype=self.dtype)
      self.x_min = 1.0
      self.x_max = 4.0
      self.expected = numpy.asarray(
          [0, 1, 1, 1, 1, 0], dtype=self.dtype
      )
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 1 for calling the TestClipBorderGrad obj's underlying member method code with example usage: obj.setUp() without return types