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

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gh-123811: test that round() can return signed zero (GH-123829)
(cherry picked from commit d2b9b6f919)

Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com>
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Miss Islington (bot) 2024-09-30 06:22:13 +02:00 • committed by GitHub
parent 5bf32d1300
commit 243db20b75
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1 changed files with 5 additions and 5 deletions
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10
Lib/test/test_float.py
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@ -830,7 +830,7 @@ class ReprTestCase(unittest.TestCase):
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)
@ -860,10 +860,10 @@ class RoundTestCase(unittest.TestCase):
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)