code: def test_to_period_infer(self):
      # https://github.com/pandas-dev/pandas/issues/33358
      rng = date_range(
          start="2019-12-22 06:40:00+00:00",
          end="2019-12-22 08:45:00+00:00",
          freq="5min",
      )
  
      with tm.assert_produces_warning(UserWarning):
          pi1 = rng.to_period("5min")
  
      with tm.assert_produces_warning(UserWarning):
          pi2 = rng.to_period()
  
      tm.assert_index_equal(pi1, pi2)
  
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 8 for calling the TestToPeriod obj's underlying member method code with example usage: obj.test_to_period_infer() without return types