code: def test_datetime_tzinfo():
      tz = pytz.timezone("Australia/Sydney")
      dt = datetime.datetime(2002, 2, 20, 13, 37, 42, 7, tzinfo=tz)
      w = DatetimePicker(value=dt)
      assert w.value == dt
      # tzinfo only changes upon input from user
      assert w.value.tzinfo == tz
  
file_path: catboost/contrib/python/ipywidgets/py3/ipywidgets/widgets/tests/test_widget_datetime.py
imports: import pytest
  from contextlib import nullcontext
  import datetime
  import itertools
  import pytz
  from traitlets import TraitError
  from ..widget_datetime import DatetimePicker
label_desc: Use image node_id 13 for calling a global function with example usage: test_datetime_tzinfo() without return types