def METHOD_NAME(self, mocked_init):
    lm_ibrun = IBRun('', {}, None, None, None)
    command = lm_ibrun.get_rank_cmd()
    self.assertIn('$SLURM_PROCID', command)
    self.assertIn('$MPI_RANK',     command)
    self.assertIn('$PMIX_RANK',    command)