code: def testSuccess(self):
      success = "Hello, World!"
      for np in (1, 2):
          status, stdout, stderr = self.execute(np=np)
          self.assertEqual(status, 0)
          self.assertEqual(stdout.count(success), np)
          self.assertEqual(stderr, "")
  
imports: import sys
  import os
  import shlex
  import shutil
  import warnings
  import subprocess
  import unittest
  import mpi4py
label_desc: Use image node_id 2 for calling the TestRunScript obj's underlying member method code with example usage: obj.testSuccess() without return types