mirror of https://github.com/python/cpython
Issue #11888: skip some log2 tests on Mac OS X Tiger
System log2() is not accurate for exact power of 2.
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@ -5,6 +5,7 @@ from test.support import run_unittest, verbose, requires_IEEE_754
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import unittest
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import math
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import os
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import platform
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import sys
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import struct
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import sysconfig
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@ -652,10 +653,6 @@ class MathTests(unittest.TestCase):
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@requires_IEEE_754
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def testLog2(self):
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self.assertRaises(TypeError, math.log2)
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# Check that we get exact equality for log2 of powers of 2.
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actual = [math.log2(math.ldexp(1.0, n)) for n in range(-1074, 1024)]
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expected = [float(n) for n in range(-1074, 1024)]
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self.assertEqual(actual, expected)
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# Check some integer values
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self.assertEqual(math.log2(1), 0.0)
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@ -671,6 +668,16 @@ class MathTests(unittest.TestCase):
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self.assertRaises(ValueError, math.log2, NINF)
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self.assertTrue(math.isnan(math.log2(NAN)))
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@requires_IEEE_754
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@unittest.skipIf(sys.platform == 'darwin'
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and platform.mac_ver()[0].startswith('10.4.'),
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'Mac OS X Tiger log2() is not accurate enough')
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def testLog2Exact(self):
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# Check that we get exact equality for log2 of powers of 2.
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actual = [math.log2(math.ldexp(1.0, n)) for n in range(-1074, 1024)]
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expected = [float(n) for n in range(-1074, 1024)]
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self.assertEqual(actual, expected)
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def testLog10(self):
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self.assertRaises(TypeError, math.log10)
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self.ftest('log10(0.1)', math.log10(0.1), -1)
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