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40 changes: 22 additions & 18 deletions pandas/tests/arithmetic/test_datetime64.py
Original file line number Diff line number Diff line change
Expand Up @@ -173,7 +173,26 @@ class TestDatetime64SeriesComparison:
)
@pytest.mark.parametrize("reverse", [True, False])
@pytest.mark.parametrize("dtype", [None, object])
def test_nat_comparisons(self, dtype, index_or_series, reverse, pair):
@pytest.mark.parametrize(
"op, expected",
[
(operator.eq, Series([False, False, True])),
(operator.ne, Series([True, True, False])),
(operator.lt, Series([False, False, False])),
(operator.gt, Series([False, False, False])),
(operator.ge, Series([False, False, True])),
(operator.le, Series([False, False, True])),
],
)
def test_nat_comparisons(
self,
dtype,
index_or_series,
reverse,
pair,
op,
expected,
):
box = index_or_series
l, r = pair
if reverse:
Expand All @@ -182,25 +201,10 @@ def test_nat_comparisons(self, dtype, index_or_series, reverse, pair):

left = Series(l, dtype=dtype)
right = box(r, dtype=dtype)
# Series, Index

expected = Series([False, False, True])
tm.assert_series_equal(left == right, expected)
result = op(left, right)

expected = Series([True, True, False])
tm.assert_series_equal(left != right, expected)

expected = Series([False, False, False])
tm.assert_series_equal(left < right, expected)

expected = Series([False, False, False])
tm.assert_series_equal(left > right, expected)

expected = Series([False, False, True])
tm.assert_series_equal(left >= right, expected)

expected = Series([False, False, True])
tm.assert_series_equal(left <= right, expected)
tm.assert_series_equal(result, expected)

def test_comparison_invalid(self, tz_naive_fixture, box_with_array):
# GH#4968
Expand Down