code: def test_scalar(self):
      actual = conv_nd.as_tuple(1, 3)
      expected = (1, 1, 1)
      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 1 for calling the TestAsTuple obj's underlying member method code with example usage: obj.test_scalar() without return types