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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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18
Lib/test/test_cmath.py
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@ -1,8 +1,9 @@
from test.support import run_unittest
from test.test_math import parse_testfile, test_file
from test.test_math import parse_testfile, test_file, requires_IEEE_754
import unittest
import cmath, math
from cmath import phase, polar, rect, pi
import sysconfig
INF = float('inf')
NAN = float('nan')
@ -61,6 +62,12 @@ class CMathTests(unittest.TestCase):
def tearDown(self):
self.test_values.close()
def assertComplexIdentical(self, a, b):
"""Fail if two complex numbers value or sign is different."""
self.assertEqual(a, b)
self.assertEqual(math.copysign(1., a.real), math.copysign(1., b.real))
self.assertEqual(math.copysign(1., a.imag), math.copysign(1., b.imag))
def rAssertAlmostEqual(self, a, b, rel_err = 2e-15, abs_err = 5e-323,
msg=None):
"""Fail if the two floating-point numbers are not almost equal.
@ -473,6 +480,15 @@ class CMathTests(unittest.TestCase):
self.assertTrue(cmath.isinf(complex(NAN, INF)))
self.assertTrue(cmath.isinf(complex(INF, 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):
self.assertComplexIdentical(cmath.tanh(complex(0., .0j)), complex(0., .0j))
self.assertComplexIdentical(cmath.tanh(complex(0., -.0j)), complex(0., -.0j))
self.assertComplexIdentical(cmath.tanh(complex(-0., .0j)), complex(-0., .0j))
self.assertComplexIdentical(cmath.tanh(complex(-0., -.0j)), complex(-0., -.0j))
def test_main():
run_unittest(CMathTests)