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import pytest
import pandas as pd
from pandas.core.arrays import period_array
class TestReductions:
def test_min_max(self):
arr = period_array(
[
"2000-01-03",
"2000-01-03",
"NaT",
"2000-01-02",
"2000-01-05",
"2000-01-04",
],
freq="D",
)
result = arr.min()
expected = pd.Period("2000-01-02", freq="D")
assert result == expected
result = arr.max()
expected = pd.Period("2000-01-05", freq="D")
assert result == expected
result = arr.min(skipna=False)
assert result is pd.NaT
result = arr.max(skipna=False)
assert result is pd.NaT
@pytest.mark.parametrize("skipna", [True, False])
def test_min_max_empty(self, skipna):
arr = period_array([], freq="D")
result = arr.min(skipna=skipna)
assert result is pd.NaT
result = arr.max(skipna=skipna)
assert result is pd.NaT