code: def test_list(self):
      actual = conv_nd.as_tuple([1, 2, 3], 3)
      expected = (1, 2, 3)
      self.assertEqual(actual, expected)
  
imports: import itertools
  import unittest
  import numpy
  from six import moves
  from chainer.backends import cuda
  from chainer import testing
  from chainer.testing import attr
  from chainer.utils import conv_nd
label_desc: Use image node_id 3 for calling the TestAsTuple obj's underlying member method code with example usage: obj.test_list() without return types