code: def testConstructor(self):
      win = MPI.Win()
      self.assertEqual(win, MPI.WIN_NULL)
      self.assertIsNot(win, MPI.WIN_NULL)
  
      def construct():
          MPI.Win((1, 2, 3))
  
      self.assertRaises(TypeError, construct)
  
imports: from mpi4py import MPI
  import mpiunittest
  import sys
label_desc: Use image node_id 1 for calling the TestWinNull obj's underlying member method code with example usage: obj.testConstructor() without return types