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[3.13] gh-123811: test that round() can return signed zero (GH-123829) #123938

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merged 3 commits into from
Sep 30, 2024
Merged

[3.13] gh-123811: test that round() can return signed zero (GH-123829) #123938

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c8c640b
gh-123811: test that round() can return signed zero (GH-123829)
skirpichev Sep 11, 2024
04d18c8
Merge branch '3.13' into backport-d2b9b6f-3.13
Yhg1s Sep 30, 2024
a0a19e8
Merge branch '3.13' into backport-d2b9b6f-3.13
Yhg1s Sep 30, 2024
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10 changes: 5 additions & 5 deletions Lib/test/test_float.py
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Original file line number Diff line number Diff line change
Expand Up @@ -830,7 +830,7 @@ def test_short_repr(self):
self.assertEqual(repr(float(negs)), str(float(negs)))

@support.requires_IEEE_754
class RoundTestCase(unittest.TestCase):
class RoundTestCase(unittest.TestCase, FloatsAreIdenticalMixin):

def test_inf_nan(self):
self.assertRaises(OverflowError, round, INF)
Expand Down Expand Up @@ -860,10 +860,10 @@ def test_large_n(self):

def test_small_n(self):
for n in [-308, -309, -400, 1-2**31, -2**31, -2**31-1, -2**100]:
self.assertEqual(round(123.456, n), 0.0)
self.assertEqual(round(-123.456, n), -0.0)
self.assertEqual(round(1e300, n), 0.0)
self.assertEqual(round(1e-320, n), 0.0)
self.assertFloatsAreIdentical(round(123.456, n), 0.0)
self.assertFloatsAreIdentical(round(-123.456, n), -0.0)
self.assertFloatsAreIdentical(round(1e300, n), 0.0)
self.assertFloatsAreIdentical(round(1e-320, n), 0.0)

def test_overflow(self):
self.assertRaises(OverflowError, round, 1.6e308, -308)
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