code: def test_max_min_none(self):
      with self.assertRaises(ValueError):
          functions.clip(self.x, None, None)
  
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 3 for calling the TestClipInvalidInterval obj's underlying member method code with example usage: obj.test_max_min_none() without return types