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import numpy as np
import pytest
from pandas import (
NaT,
PeriodIndex,
period_range,
)
import pandas._testing as tm
from pandas.tseries import offsets
class TestPickle:
@pytest.mark.parametrize("freq", ["D", "M", "Y"])
def test_pickle_round_trip(self, freq):
idx = PeriodIndex(["2016-05-16", "NaT", NaT, np.nan], freq=freq)
result = tm.round_trip_pickle(idx)
tm.assert_index_equal(result, idx)
def test_pickle_freq(self):
# GH#2891
prng = period_range("1/1/2011", "1/1/2012", freq="M")
new_prng = tm.round_trip_pickle(prng)
assert new_prng.freq == offsets.MonthEnd()
assert new_prng.freqstr == "M"