code: def test_to_period_quarterlyish(self, off):
      rng = date_range("01-Jan-2012", periods=8, freq=off)
      prng = rng.to_period()
      assert prng.freq == "QE-DEC"
  
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 3 for calling the TestToPeriod obj's underlying member method code with example usage: obj.test_to_period_quarterlyish(off) without return types