code: def testIrecv(self):
      if isinstance(self.COMM, pkl5.Comm):
          self.assertRaises(
              RuntimeError,
              self.COMM.irecv,
              None,
              MPI.PROC_NULL,
              0,
          )
  
imports: from mpi4py import MPI
  from mpi4py.util import pkl5
  import sys, os
label_desc: Use image node_id 15 for calling the BaseTest obj's underlying member method code with example usage: obj.testIrecv() without return types