code: def test_to_period_tz_utc_offset_consistency(self, tz):
      # GH#22905
      ts = date_range("1/1/2000", "2/1/2000", tz="Etc/GMT-1")
      with tm.assert_produces_warning(UserWarning):
          result = ts.to_period()[0]
          expected = ts[0].to_period(ts.freq)
          assert result == expected
  
imports: import dateutil.tz
  from dateutil.tz import tzlocal
  import pytest
  import pytz
  from pandas._libs.tslibs.ccalendar import MONTHS
  from pandas._libs.tslibs.offsets import MonthEnd
  from pandas._libs.tslibs.period import INVALID_FREQ_ERR_MSG
  from pandas import DatetimeIndex, Period, PeriodIndex, Timestamp, date_range, period_range
  import pandas._testing
label_desc: Use image node_id 13 for calling the TestToPeriod obj's underlying member method code with example usage: obj.test_to_period_tz_utc_offset_consistency(tz) without return types