code: def test_parallel(self):
      iters = unzip(self.iterable)
  
      self.assertEqual(len(iters), 3)
  
      for i in range(10):
          self.assertEqual(next(iters[0]), i)
          self.assertEqual(next(iters[1]), i + 1)
          self.assertEqual(next(iters[2]), i * i)
  
imports: import random
  import unittest
  from chainer import testing
  from chainercv.utils import unzip
label_desc: Use image node_id 3 for calling the TestUnzipWithInfiniteIterator obj's underlying member method code with example usage: obj.test_parallel() without return types