code: def testCall(self):
      mpiobj = self.mpiobj
      mpiobj.Set_errhandler(MPI.ERRORS_RETURN)
      try:
          mpiobj.Call_errhandler(MPI.SUCCESS)
          mpiobj.Call_errhandler(MPI.ERR_OTHER)
      except NotImplementedError:
          if MPI.VERSION >= 2:
              raise
          clsname = type(mpiobj).__name__.lower()
          self.skipTest(f"mpi-{clsname}-call_errhandler")
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 2 for calling the BaseTestErrhandler obj's underlying member method code with example usage: obj.testCall() without return types