code: def test_wrap_list(self) -> None:
      prop = bcpn.Nullable(List(Int))
      assert prop.wrap(None) is None
      wrapped = prop.wrap([10, 20])
      assert isinstance(wrapped, PropertyValueList)
      assert prop.wrap(wrapped) is wrapped
  
imports: from __future__ import annotations
  import pytest
  import warnings
  from typing import TYPE_CHECKING, Union
  from bokeh.core.properties import Dict, Instance, Int, List, String
  from bokeh.core.property.wrappers import PropertyValueDict, PropertyValueList
  from bokeh.util.warnings import BokehDeprecationWarning
  from tests.support.util.api import verify_all
  from _util_property import _TestHasProps, _TestModel
  import bokeh.core.property.nullable
label_desc: Use image node_id 9 for calling the Test_Nullable obj's underlying member method code with example usage: obj.test_wrap_list() without return types