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gh-121039: add Floats/ComplexesAreIdenticalMixin to test.support.testcase (GH-121071)

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Sergey B Kirpichev 2024-09-08 16:01:54 +03:00 committed by GitHub
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6 changed files with 65 additions and 120 deletions
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40
Lib/test/support/testcase.py
View File

@ -1,3 +1,6 @@
from math import copysign, isnan
class ExceptionIsLikeMixin:
def assertExceptionIsLike(self, exc, template):
"""
@ -23,3 +26,40 @@ class ExceptionIsLikeMixin:
self.assertEqual(len(exc.exceptions), len(template.exceptions))
for e, t in zip(exc.exceptions, template.exceptions):
self.assertExceptionIsLike(e, t)
class FloatsAreIdenticalMixin:
def assertFloatsAreIdentical(self, x, y):
"""Fail unless floats x and y are identical, in the sense that:
(1) both x and y are nans, or
(2) both x and y are infinities, with the same sign, or
(3) both x and y are zeros, with the same sign, or
(4) x and y are both finite and nonzero, and x == y
"""
msg = 'floats {!r} and {!r} are not identical'
if isnan(x) or isnan(y):
if isnan(x) and isnan(y):
return
elif x == y:
if x != 0.0:
return
# both zero; check that signs match
elif copysign(1.0, x) == copysign(1.0, y):
return
else:
msg += ': zeros have different signs'
self.fail(msg.format(x, y))
class ComplexesAreIdenticalMixin(FloatsAreIdenticalMixin):
def assertComplexesAreIdentical(self, x, y):
"""Fail unless complex numbers x and y have equal values and signs.
In particular, if x and y both have real (or imaginary) part
zero, but the zeros have different signs, this test will fail.
"""
self.assertFloatsAreIdentical(x.real, y.real)
self.assertFloatsAreIdentical(x.imag, y.imag)

27
Lib/test/test_capi/test_getargs.py
View File

@ -6,6 +6,7 @@ from test import support
from test.support import import_helper
from test.support import script_helper
from test.support import warnings_helper
from test.support.testcase import FloatsAreIdenticalMixin
# Skip this test if the _testcapi module isn't available.
_testcapi = import_helper.import_module('_testcapi')
from _testcapi import getargs_keywords, getargs_keyword_only
@ -436,11 +437,7 @@ class LongLong_TestCase(unittest.TestCase):
self.assertEqual(VERY_LARGE & ULLONG_MAX, getargs_K(VERY_LARGE))
class Float_TestCase(unittest.TestCase):
def assertEqualWithSign(self, actual, expected):
self.assertEqual(actual, expected)
self.assertEqual(math.copysign(1, actual), math.copysign(1, expected))
class Float_TestCase(unittest.TestCase, FloatsAreIdenticalMixin):
def test_f(self):
from _testcapi import getargs_f
self.assertEqual(getargs_f(4.25), 4.25)
@ -462,10 +459,10 @@ class Float_TestCase(unittest.TestCase):
self.assertEqual(getargs_f(DBL_MAX), INF)
self.assertEqual(getargs_f(-DBL_MAX), -INF)
if FLT_MIN > DBL_MIN:
self.assertEqualWithSign(getargs_f(DBL_MIN), 0.0)
self.assertEqualWithSign(getargs_f(-DBL_MIN), -0.0)
self.assertEqualWithSign(getargs_f(0.0), 0.0)
self.assertEqualWithSign(getargs_f(-0.0), -0.0)
self.assertFloatsAreIdentical(getargs_f(DBL_MIN), 0.0)
self.assertFloatsAreIdentical(getargs_f(-DBL_MIN), -0.0)
self.assertFloatsAreIdentical(getargs_f(0.0), 0.0)
self.assertFloatsAreIdentical(getargs_f(-0.0), -0.0)
r = getargs_f(NAN)
self.assertNotEqual(r, r)
@ -494,8 +491,8 @@ class Float_TestCase(unittest.TestCase):
self.assertEqual(getargs_d(x), x)
self.assertRaises(OverflowError, getargs_d, 1<<DBL_MAX_EXP)
self.assertRaises(OverflowError, getargs_d, -1<<DBL_MAX_EXP)
self.assertEqualWithSign(getargs_d(0.0), 0.0)
self.assertEqualWithSign(getargs_d(-0.0), -0.0)
self.assertFloatsAreIdentical(getargs_d(0.0), 0.0)
self.assertFloatsAreIdentical(getargs_d(-0.0), -0.0)
r = getargs_d(NAN)
self.assertNotEqual(r, r)
@ -519,10 +516,10 @@ class Float_TestCase(unittest.TestCase):
self.assertEqual(getargs_D(c), c)
c = complex(1.0, x)
self.assertEqual(getargs_D(c), c)
self.assertEqualWithSign(getargs_D(complex(0.0, 1.0)).real, 0.0)
self.assertEqualWithSign(getargs_D(complex(-0.0, 1.0)).real, -0.0)
self.assertEqualWithSign(getargs_D(complex(1.0, 0.0)).imag, 0.0)
self.assertEqualWithSign(getargs_D(complex(1.0, -0.0)).imag, -0.0)
self.assertFloatsAreIdentical(getargs_D(complex(0.0, 1.0)).real, 0.0)
self.assertFloatsAreIdentical(getargs_D(complex(-0.0, 1.0)).real, -0.0)
self.assertFloatsAreIdentical(getargs_D(complex(1.0, 0.0)).imag, 0.0)
self.assertFloatsAreIdentical(getargs_D(complex(1.0, -0.0)).imag, -0.0)
class Paradox:

42
Lib/test/test_cmath.py
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@ -1,4 +1,5 @@
from test.support import requires_IEEE_754, cpython_only, import_helper
from test.support.testcase import ComplexesAreIdenticalMixin
from test.test_math import parse_testfile, test_file
import test.test_math as test_math
import unittest
@ -49,7 +50,7 @@ complex_nans = [complex(x, y) for x, y in [
(INF, NAN)
]]
class CMathTests(unittest.TestCase):
class CMathTests(ComplexesAreIdenticalMixin, unittest.TestCase):
# list of all functions in cmath
test_functions = [getattr(cmath, fname) for fname in [
'acos', 'acosh', 'asin', 'asinh', 'atan', 'atanh',
@ -65,39 +66,6 @@ class CMathTests(unittest.TestCase):
def tearDown(self):
self.test_values.close()
def assertFloatIdentical(self, x, y):
"""Fail unless floats x and y are identical, in the sense that:
(1) both x and y are nans, or
(2) both x and y are infinities, with the same sign, or
(3) both x and y are zeros, with the same sign, or
(4) x and y are both finite and nonzero, and x == y
"""
msg = 'floats {!r} and {!r} are not identical'
if math.isnan(x) or math.isnan(y):
if math.isnan(x) and math.isnan(y):
return
elif x == y:
if x != 0.0:
return
# both zero; check that signs match
elif math.copysign(1.0, x) == math.copysign(1.0, y):
return
else:
msg += ': zeros have different signs'
self.fail(msg.format(x, y))
def assertComplexIdentical(self, x, y):
"""Fail unless complex numbers x and y have equal values and signs.
In particular, if x and y both have real (or imaginary) part
zero, but the zeros have different signs, this test will fail.
"""
self.assertFloatIdentical(x.real, y.real)
self.assertFloatIdentical(x.imag, y.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.
@ -555,7 +523,7 @@ class CMathTests(unittest.TestCase):
@requires_IEEE_754
def testTanhSign(self):
for z in complex_zeros:
self.assertComplexIdentical(cmath.tanh(z), z)
self.assertComplexesAreIdentical(cmath.tanh(z), z)
# The algorithm used for atan and atanh makes use of the system
# log1p function; If that system function doesn't respect the sign
@ -564,12 +532,12 @@ class CMathTests(unittest.TestCase):
@requires_IEEE_754
def testAtanSign(self):
for z in complex_zeros:
self.assertComplexIdentical(cmath.atan(z), z)
self.assertComplexesAreIdentical(cmath.atan(z), z)
@requires_IEEE_754
def testAtanhSign(self):
for z in complex_zeros:
self.assertComplexIdentical(cmath.atanh(z), z)
self.assertComplexesAreIdentical(cmath.atanh(z), z)
class IsCloseTests(test_math.IsCloseTests):

33
Lib/test/test_complex.py
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@ -1,6 +1,7 @@
import unittest
import sys
from test import support
from test.support.testcase import ComplexesAreIdenticalMixin
from test.test_grammar import (VALID_UNDERSCORE_LITERALS,
INVALID_UNDERSCORE_LITERALS)
@ -52,7 +53,7 @@ class WithComplex:
def __complex__(self):
return self.value
class ComplexTest(unittest.TestCase):
class ComplexTest(ComplexesAreIdenticalMixin, unittest.TestCase):
def assertAlmostEqual(self, a, b):
if isinstance(a, complex):
@ -81,33 +82,6 @@ class ComplexTest(unittest.TestCase):
# check that relative difference < eps
self.assertTrue(abs((x-y)/y) < eps)
def assertFloatsAreIdentical(self, x, y):
"""assert that floats x and y are identical, in the sense that:
(1) both x and y are nans, or
(2) both x and y are infinities, with the same sign, or
(3) both x and y are zeros, with the same sign, or
(4) x and y are both finite and nonzero, and x == y
"""
msg = 'floats {!r} and {!r} are not identical'
if isnan(x) or isnan(y):
if isnan(x) and isnan(y):
return
elif x == y:
if x != 0.0:
return
# both zero; check that signs match
elif copysign(1.0, x) == copysign(1.0, y):
return
else:
msg += ': zeros have different signs'
self.fail(msg.format(x, y))
def assertComplexesAreIdentical(self, x, y):
self.assertFloatsAreIdentical(x.real, y.real)
self.assertFloatsAreIdentical(x.imag, y.imag)
def assertClose(self, x, y, eps=1e-9):
"""Return true iff complexes x and y "are close"."""
self.assertCloseAbs(x.real, y.real, eps)
@ -829,8 +803,7 @@ class ComplexTest(unittest.TestCase):
for y in vals:
z = complex(x, y)
roundtrip = complex(repr(z))
self.assertFloatsAreIdentical(z.real, roundtrip.real)
self.assertFloatsAreIdentical(z.imag, roundtrip.imag)
self.assertComplexesAreIdentical(z, roundtrip)
# if we predefine some constants, then eval(repr(z)) should
# also work, except that it might change the sign of zeros

31
Lib/test/test_ctypes/test_numbers.py
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@ -4,12 +4,12 @@ import struct
import sys
import unittest
from itertools import combinations
from math import copysign, isnan
from operator import truth
from ctypes import (byref, sizeof, alignment,
c_char, c_byte, c_ubyte, c_short, c_ushort, c_int, c_uint,
c_long, c_ulong, c_longlong, c_ulonglong,
c_float, c_double, c_longdouble, c_bool)
from test.support.testcase import ComplexesAreIdenticalMixin
def valid_ranges(*types):
@ -62,34 +62,7 @@ INF = float("inf")
NAN = float("nan")
class NumberTestCase(unittest.TestCase):
# from Lib/test/test_complex.py
def assertFloatsAreIdentical(self, x, y):
"""assert that floats x and y are identical, in the sense that:
(1) both x and y are nans, or
(2) both x and y are infinities, with the same sign, or
(3) both x and y are zeros, with the same sign, or
(4) x and y are both finite and nonzero, and x == y
"""
msg = 'floats {!r} and {!r} are not identical'
if isnan(x) or isnan(y):
if isnan(x) and isnan(y):
return
elif x == y:
if x != 0.0:
return
# both zero; check that signs match
elif copysign(1.0, x) == copysign(1.0, y):
return
else:
msg += ': zeros have different signs'
self.fail(msg.format(x, y))
def assertComplexesAreIdentical(self, x, y):
self.assertFloatsAreIdentical(x.real, y.real)
self.assertFloatsAreIdentical(x.imag, y.imag)
class NumberTestCase(unittest.TestCase, ComplexesAreIdenticalMixin):
def test_default_init(self):
# default values are set to zero

12
Lib/test/test_float.py
View File

@ -8,6 +8,7 @@ import time
import unittest
from test import support
from test.support.testcase import FloatsAreIdenticalMixin
from test.test_grammar import (VALID_UNDERSCORE_LITERALS,
INVALID_UNDERSCORE_LITERALS)
from math import isinf, isnan, copysign, ldexp
@ -1093,21 +1094,14 @@ class InfNanTest(unittest.TestCase):
fromHex = float.fromhex
toHex = float.hex
class HexFloatTestCase(unittest.TestCase):
class HexFloatTestCase(FloatsAreIdenticalMixin, unittest.TestCase):
MAX = fromHex('0x.fffffffffffff8p+1024') # max normal
MIN = fromHex('0x1p-1022') # min normal
TINY = fromHex('0x0.0000000000001p-1022') # min subnormal
EPS = fromHex('0x0.0000000000001p0') # diff between 1.0 and next float up
def identical(self, x, y):
# check that floats x and y are identical, or that both
# are NaNs
if isnan(x) or isnan(y):
if isnan(x) == isnan(y):
return
elif x == y and (x != 0.0 or copysign(1.0, x) == copysign(1.0, y)):
return
self.fail('%r not identical to %r' % (x, y))
self.assertFloatsAreIdentical(x, y)
def test_ends(self):
self.identical(self.MIN, ldexp(1.0, -1022))