Mercurial > cpython-lru_cache-weakref
diff Lib/test/test_math.py @ 66064:fdcaac0e010a
Issue #10337: skip tests of tanh() sign in test_math and test_cmath if tanh()
doesn't preserve the zero sign (if TANH_PRESERVES_ZERO_SIGN define is 0).
| author | Victor Stinner <victor.stinner@haypocalc.com> |
|---|---|
| date | Sun, 07 Nov 2010 14:14:27 +0000 |
| parents | a9349fd3d0f7 |
| children | 9fe76c26ea9f |
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--- a/Lib/test/test_math.py Sun Nov 07 12:57:04 2010 +0000 +++ b/Lib/test/test_math.py Sun Nov 07 14:14:27 2010 +0000 @@ -8,6 +8,7 @@ import sys import random import struct +import sysconfig eps = 1E-05 NAN = float('nan') @@ -891,11 +892,15 @@ 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 @@ 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}"