code: def test_isotime_midnight(isostr):
      iparser = isoparser()
      assert iparser.parse_isotime(isostr) == time(0, 0, 0, 0)
  
imports: from __future__ import unicode_literals
  from datetime import datetime, timedelta, date, time
  import itertools
  from dateutil import tz
  from dateutil.tz import UTC
  from dateutil.parser import isoparser, isoparse
  import pytest
  import six
label_desc: Use image node_id 31 for calling a global function with example usage: test_isotime_midnight(isostr) without return types