code: def test_to_period(self, input_vals):
      # GH#21205
      expected = Series([input_vals], dtype="Period[D]")
      result = Series(
          [input_vals], dtype="datetime64[ns]"
      ).dt.to_period("D")
      tm.assert_series_equal(result, expected)
  
imports: import calendar
  from datetime import date, datetime, time
  import locale
  import unicodedata
  import numpy
  import pytest
  import pytz
  from pandas._libs.tslibs.timezones import maybe_get_tz
  from pandas.errors import SettingWithCopyError
  from pandas.core.dtypes.common import is_integer_dtype, is_list_like
  import pandas
  from pandas import DataFrame, DatetimeIndex, Index, Period, PeriodIndex, Series, TimedeltaIndex, date_range, period_range, timedelta_range
  import pandas._testing
  from pandas.core.arrays import DatetimeArray, PeriodArray, TimedeltaArray
label_desc: Use image node_id 2 for calling the TestSeriesPeriodValuesDtAccessor obj's underlying member method code with example usage: obj.test_to_period(input_vals) without return types