code: def test_starmap(self):
      tuples = list(zip(range(10), range(9, -1, -1)))
      self.assertEqual(
          self.pool.starmap(mul, tuples),
          list(itertools.starmap(mul, tuples)),
      )
      tuples = list(zip(range(100), range(99, -1, -1)))
      self.assertEqual(
          self.pool.starmap(mul, tuples, chunksize=20),
          list(itertools.starmap(mul, tuples)),
      )
  
imports: from mpi4py import MPI
  import mpi4py.util.pool
  import concurrent.futures
  import itertools
  import functools
  import warnings
  import unittest
  import time
  import sys
  import os
label_desc: Use image node_id 8 for calling the BaseTestPool obj's underlying member method code with example usage: obj.test_starmap() without return types