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Use skipUnless to skip math module tests on non-IEEE 754 platforms.

This commit is contained in:
Mark Dickinson 2009-09-18 21:01:50 +00:00
parent 6be522bfc2
commit 2985dbb526
1 changed files with 34 additions and 31 deletions
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13
Lib/test/test_math.py
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@ -13,6 +13,11 @@ NAN = float('nan')
INF = float('inf') INF = float('inf')
NINF = float('-inf') NINF = float('-inf')
# decorator for skipping tests on non-IEEE 754 platforms
requires_IEEE_754 = unittest.skipUnless(
float.__getformat__("double").startswith("IEEE"),
"test requires IEEE 754 doubles")
# detect evidence of double-rounding: fsum is not always correctly # detect evidence of double-rounding: fsum is not always correctly
# rounded on machines that suffer from double rounding. # rounded on machines that suffer from double rounding.
x, y = 1e16, 2.9999 # use temporary values to defeat peephole optimizer x, y = 1e16, 2.9999 # use temporary values to defeat peephole optimizer
@ -212,7 +217,7 @@ class MathTests(unittest.TestCase):
self.assertRaises(TypeError, math.ceil, t) self.assertRaises(TypeError, math.ceil, t)
self.assertRaises(TypeError, math.ceil, t, 0) self.assertRaises(TypeError, math.ceil, t, 0)
if float.__getformat__("double").startswith("IEEE"): @requires_IEEE_754
def testCopysign(self): def testCopysign(self):
self.assertRaises(TypeError, math.copysign) self.assertRaises(TypeError, math.copysign)
# copysign should let us distinguish signs of zeros # copysign should let us distinguish signs of zeros
@ -369,8 +374,7 @@ class MathTests(unittest.TestCase):
self.assertEquals(math.frexp(NINF)[0], NINF) self.assertEquals(math.frexp(NINF)[0], NINF)
self.assertTrue(math.isnan(math.frexp(NAN)[0])) self.assertTrue(math.isnan(math.frexp(NAN)[0]))
@unittest.skipUnless(float.__getformat__("double").startswith("IEEE"), @requires_IEEE_754
"test requires IEEE 754 doubles")
@unittest.skipIf(HAVE_DOUBLE_ROUNDING, @unittest.skipIf(HAVE_DOUBLE_ROUNDING,
"fsum is not exact on machines with double rounding") "fsum is not exact on machines with double rounding")
def testFsum(self): def testFsum(self):
@ -860,9 +864,8 @@ class MathTests(unittest.TestCase):
else: else:
self.fail("sqrt(-1) didn't raise ValueError") self.fail("sqrt(-1) didn't raise ValueError")
@requires_IEEE_754
def test_testfile(self): def test_testfile(self):
if not float.__getformat__("double").startswith("IEEE"):
return
for id, fn, ar, ai, er, ei, flags in parse_testfile(test_file): for id, fn, ar, ai, er, ei, flags in parse_testfile(test_file):
# Skip if either the input or result is complex, or if # Skip if either the input or result is complex, or if
# flags is nonempty # flags is nonempty