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Issue #10337: skip tests of tanh() sign in test_math and test_cmath if tanh()

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doesn't preserve the zero sign (if TANH_PRESERVES_ZERO_SIGN define is 0).
This commit is contained in:
Victor Stinner 2010-11-07 14:14:27 +00:00
parent 7089a4e127
commit be3da38e0a
3 changed files with 35 additions and 12 deletions
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16
Lib/test/test_math.py
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@ -8,6 +8,7 @@ import os
import sys
import random
import struct
import sysconfig
eps = 1E-05
NAN = float('nan')
@ -891,11 +892,15 @@ class MathTests(unittest.TestCase):
self.ftest('tanh(inf)', math.tanh(INF), 1)
self.ftest('tanh(-inf)', math.tanh(NINF), -1)
self.assertTrue(math.isnan(math.tanh(NAN)))
@requires_IEEE_754
@unittest.skipIf(sysconfig.get_config_var('TANH_PRESERVES_ZERO_SIGN') == 0,
"system tanh() function doesn't copy the sign")
def testTanhSign(self):
# check that tanh(-0.) == -0. on IEEE 754 systems
if float.__getformat__("double").startswith("IEEE"):
self.assertEqual(math.tanh(-0.), -0.)
self.assertEqual(math.copysign(1., math.tanh(-0.)),
math.copysign(1., -0.))
self.assertEqual(math.tanh(-0.), -0.)
self.assertEqual(math.copysign(1., math.tanh(-0.)),
math.copysign(1., -0.))
def test_trunc(self):
self.assertEqual(math.trunc(1), 1)
@ -1008,8 +1013,7 @@ class MathTests(unittest.TestCase):
self.fail(message)
self.ftest("%s:%s(%r)" % (id, fn, ar), result, er)
@unittest.skipUnless(float.__getformat__("double").startswith("IEEE"),
"test requires IEEE 754 doubles")
@requires_IEEE_754
def test_mtestfile(self):
ALLOWED_ERROR = 20 # permitted error, in ulps
fail_fmt = "{}:{}({!r}): expected {!r}, got {!r}"