code: def test_parse_tzstr_zero_as_utc(tzstr, zero_as_utc):
      tzi = isoparser().parse_tzstr(tzstr, zero_as_utc=zero_as_utc)
      assert tzi == UTC
      assert (type(tzi) == tz.tzutc) == zero_as_utc
  
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 23 for calling a global function with example usage: test_parse_tzstr_zero_as_utc(tzstr, zero_as_utc) without return types