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gh-123811: test that round() can return signed zero #123829

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Merged
vstinner merged 3 commits into from
Sep 11, 2024
+5 −5
Merged

gh-123811: test that round() can return signed zero #123829

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d0be987
gh-123811: test that round() can return signed zero
skirpichev Sep 8, 2024
6d18f0a
Merge branch 'master' into test-round-szero-123811
skirpichev Sep 8, 2024
42c3783
redo on top of python/cpython#121071
skirpichev Sep 8, 2024
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redo on top of #121071
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@skirpichev
skirpichev committed Sep 8, 2024
commit 42c378316b4e757ab78395d5bd9bd8493eb5bf25
24 changes: 1 addition & 23 deletions Lib/test/test_float.py
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Original file line number Diff line number Diff line change
Expand Up @@ -863,29 +863,7 @@ def test_short_repr(self):
self.assertEqual(repr(float(negs)), str(float(negs)))

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

def assertFloatsAreIdentical(self, x, y):
"""Fail unless floats x and y are identical, in the sense that:
(1) both x and y are nans, or
(2) both x and y are infinities, with the same sign, or
(3) both x and y are zeros, with the same sign, or
(4) x and y are both finite and nonzero, and x == y
"""
msg = 'floats {!r} and {!r} are not identical'

if isnan(x) or isnan(y):
if isnan(x) and isnan(y):
return
elif x == y:
if x != 0.0:
return
# both zero; check that signs match
elif copysign(1.0, x) == copysign(1.0, y):
return
else:
msg += ': zeros have different signs'
self.fail(msg.format(x, y))
class RoundTestCase(unittest.TestCase, FloatsAreIdenticalMixin):

def test_inf_nan(self):
self.assertRaises(OverflowError, round, INF)
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