code: def testPointToPoint(self):
      comm = self.COMM
      comm.Sendrecv(
          sendbuf=self.null_b,
          dest=comm.rank,
          recvbuf=self.null_b,
          source=comm.rank,
      )
      r2 = comm.Irecv(self.null_b, comm.rank)
      r1 = comm.Isend(self.null_b, comm.rank)
      MPI.Request.Waitall([r1, r2])
  
file_path: mpi4py/test/test_msgzero.py
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 1 for calling the BaseTestMessageZero obj's underlying member method code with example usage: obj.testPointToPoint() without return types