code: def test_str(self) -> None:
      prop = bcpd.Datetime()
      assert str(prop) == "Datetime"
  
imports: from __future__ import annotations
  import pytest
  import datetime
  import numpy
  import pandas
  from bokeh.util.serialization import convert_date_to_datetime
  from tests.support.util.api import verify_all
  from _util_property import _TestHasProps, _TestModel
  import bokeh.core.property.datetime
label_desc: Use image node_id 7 for calling the Test_Datetime obj's underlying member method code with example usage: obj.test_str() without return types