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import numpy as np
import pytest
from pandas import (
NaT,
PeriodIndex,
period_range,
)
import pandas._testing as tm
class TestInsert:
@pytest.mark.parametrize("na", [np.nan, NaT, None])
def test_insert(self, na):
# GH#18295 (test missing)
expected = PeriodIndex(["2017Q1", NaT, "2017Q2", "2017Q3", "2017Q4"], freq="Q")
result = period_range("2017Q1", periods=4, freq="Q").insert(1, na)
tm.assert_index_equal(result, expected)