code: def test_unique_nodelete():
      from pybind11_tests import MyObject4
  
      o = MyObject4(23)
      assert o.value == 23
      cstats = ConstructorStats.get(MyObject4)
      assert cstats.alive() == 1
      del o
      cstats = ConstructorStats.get(MyObject4)
      assert cstats.alive() == 1
  
imports: import pytest
  from pybind11_tests import ConstructorStats
label_desc: Use image node_id 3 for calling a global function with example usage: test_unique_nodelete() without return types