code: def test_invalid_order_sampler(self):
      dataset = [1, 2, 3, 4, 5, 6]
  
      with self.assertRaises(ValueError):
          it = iterators.MultithreadIterator(
              dataset, 6, order_sampler=InvalidOrderSampler()
          )
          it.next()
  
imports: from __future__ import division
  import copy
  import unittest
  import numpy
  import six
  from chainer import iterators
  from chainer import serializers
  from chainer import testing
label_desc: Use image node_id 1 for calling the TestMultithreadIteratorInvalidOrderSampler obj's underlying member method code with example usage: obj.test_invalid_order_sampler() without return types