code: def testWait(self):
      self.REQUEST.Wait()
      self.REQUEST.Wait(None)
      self.REQUEST.Wait(self.STATUS)
      self.assertIs(self.REQUEST.Wait(), True)
      self.REQUEST.wait()
      self.REQUEST.wait(None)
      self.REQUEST.wait(self.STATUS)
      self.assertIsNone(self.REQUEST.wait())
  
file_path: mpi4py/test/test_request.py
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 2 for calling the TestRequest obj's underlying member method code with example usage: obj.testWait() without return types