code: def test_serialized(self) -> None:
      prop = bcpi.Instance(_TestModel)
      assert prop.serialized is True
  
imports: from __future__ import annotations
  import pytest
  from pandas import DataFrame, Series
  from pandas.core.groupby import GroupBy
  from bokeh.core.has_props import HasProps
  from tests.support.util.api import verify_all
  from _util_property import _TestHasProps, _TestModel, _TestModel2
  import bokeh.core.property.instance
label_desc: Use image node_id 2 for calling the Test_Instance obj's underlying member method code with example usage: obj.test_serialized() without return types