code: def test_constructor_datetime64arr_ok(self, box):
      # https://github.com/pandas-dev/pandas/issues/23438
      data = date_range("2017", periods=4, freq="ME")
      if box is None:
          data = data._values
      elif box == "series":
          data = Series(data)
  
      result = PeriodIndex(data, freq="D")
      expected = PeriodIndex(
          ["2017-01-31", "2017-02-28", "2017-03-31", "2017-04-30"],
          freq="D",
      )
      tm.assert_index_equal(result, expected)
  
imports: import numpy
  import pytest
  from pandas._libs.tslibs.period import IncompatibleFrequency
  from pandas.core.dtypes.dtypes import PeriodDtype
  from pandas import Index, NaT, Period, PeriodIndex, Series, date_range, offsets, period_range
  import pandas._testing
  from pandas.core.arrays import PeriodArray
label_desc: Use image node_id 15 for calling the TestPeriodIndex obj's underlying member method code with example usage: obj.test_constructor_datetime64arr_ok(box) without return types