code: def test_constructor(self):
      with self.assertRaises(ValueError):
          DistCall(nnodes=1, nproc_per_node=0)
      with self.assertRaises(ValueError):
          DistCall(nnodes=0, nproc_per_node=0)
      with self.assertRaises(ValueError):
          DistCall(nnodes=0, nproc_per_node=1)
      _ = DistCall(nnodes=1, nproc_per_node=1)
  
imports: from __future__ import annotations
  import unittest
  from tests.utils import DistCall, DistTestCase
label_desc: Use image node_id 1 for calling the DistributedCallTest obj's underlying member method code with example usage: obj.test_constructor() without return types