https://github.com/python/cpython/commit/52756c30dbedafc6e5db3950049f18db2020b4bb
commit: 52756c30dbedafc6e5db3950049f18db2020b4bb
branch: main
author: Sergey B Kirpichev <skirpic...@gmail.com>
committer: vstinner <vstin...@python.org>
date: 2025-03-12T07:22:28+01:00
summary:
Use subTest() in math.fma() tests (#131125)
files:
M Lib/test/test_math.py
diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py
index 2c57d288bc03ff..ba94a29800c871 100644
--- a/Lib/test/test_math.py
+++ b/Lib/test/test_math.py
@@ -2693,9 +2693,10 @@ def test_fma_nan_results(self):
# If any input is a NaN, the result should be a NaN, too.
for a, b in itertools.product(values, repeat=2):
- self.assertIsNaN(math.fma(math.nan, a, b))
- self.assertIsNaN(math.fma(a, math.nan, b))
- self.assertIsNaN(math.fma(a, b, math.nan))
+ with self.subTest(a=a, b=b):
+ self.assertIsNaN(math.fma(math.nan, a, b))
+ self.assertIsNaN(math.fma(a, math.nan, b))
+ self.assertIsNaN(math.fma(a, b, math.nan))
def test_fma_infinities(self):
# Cases involving infinite inputs or results.
@@ -2707,57 +2708,62 @@ def test_fma_infinities(self):
for c in non_nans:
for infinity in [math.inf, -math.inf]:
for zero in [0.0, -0.0]:
- with self.assertRaises(ValueError):
- math.fma(infinity, zero, c)
- with self.assertRaises(ValueError):
- math.fma(zero, infinity, c)
+ with self.subTest(c=c, infinity=infinity, zero=zero):
+ with self.assertRaises(ValueError):
+ math.fma(infinity, zero, c)
+ with self.assertRaises(ValueError):
+ math.fma(zero, infinity, c)
# ValueError when a*b and c both infinite of opposite signs.
for b in positives:
- with self.assertRaises(ValueError):
- math.fma(math.inf, b, -math.inf)
- with self.assertRaises(ValueError):
- math.fma(math.inf, -b, math.inf)
- with self.assertRaises(ValueError):
- math.fma(-math.inf, -b, -math.inf)
- with self.assertRaises(ValueError):
- math.fma(-math.inf, b, math.inf)
- with self.assertRaises(ValueError):
- math.fma(b, math.inf, -math.inf)
- with self.assertRaises(ValueError):
- math.fma(-b, math.inf, math.inf)
- with self.assertRaises(ValueError):
- math.fma(-b, -math.inf, -math.inf)
- with self.assertRaises(ValueError):
- math.fma(b, -math.inf, math.inf)
+ with self.subTest(b=b):
+ with self.assertRaises(ValueError):
+ math.fma(math.inf, b, -math.inf)
+ with self.assertRaises(ValueError):
+ math.fma(math.inf, -b, math.inf)
+ with self.assertRaises(ValueError):
+ math.fma(-math.inf, -b, -math.inf)
+ with self.assertRaises(ValueError):
+ math.fma(-math.inf, b, math.inf)
+ with self.assertRaises(ValueError):
+ math.fma(b, math.inf, -math.inf)
+ with self.assertRaises(ValueError):
+ math.fma(-b, math.inf, math.inf)
+ with self.assertRaises(ValueError):
+ math.fma(-b, -math.inf, -math.inf)
+ with self.assertRaises(ValueError):
+ math.fma(b, -math.inf, math.inf)
# Infinite result when a*b and c both infinite of the same sign.
for b in positives:
- self.assertEqual(math.fma(math.inf, b, math.inf), math.inf)
- self.assertEqual(math.fma(math.inf, -b, -math.inf), -math.inf)
- self.assertEqual(math.fma(-math.inf, -b, math.inf), math.inf)
- self.assertEqual(math.fma(-math.inf, b, -math.inf), -math.inf)
- self.assertEqual(math.fma(b, math.inf, math.inf), math.inf)
- self.assertEqual(math.fma(-b, math.inf, -math.inf), -math.inf)
- self.assertEqual(math.fma(-b, -math.inf, math.inf), math.inf)
- self.assertEqual(math.fma(b, -math.inf, -math.inf), -math.inf)
+ with self.subTest(b=b):
+ self.assertEqual(math.fma(math.inf, b, math.inf), math.inf)
+ self.assertEqual(math.fma(math.inf, -b, -math.inf), -math.inf)
+ self.assertEqual(math.fma(-math.inf, -b, math.inf), math.inf)
+ self.assertEqual(math.fma(-math.inf, b, -math.inf), -math.inf)
+ self.assertEqual(math.fma(b, math.inf, math.inf), math.inf)
+ self.assertEqual(math.fma(-b, math.inf, -math.inf), -math.inf)
+ self.assertEqual(math.fma(-b, -math.inf, math.inf), math.inf)
+ self.assertEqual(math.fma(b, -math.inf, -math.inf), -math.inf)
# Infinite result when a*b finite, c infinite.
for a, b in itertools.product(finites, finites):
- self.assertEqual(math.fma(a, b, math.inf), math.inf)
- self.assertEqual(math.fma(a, b, -math.inf), -math.inf)
+ with self.subTest(b=b):
+ self.assertEqual(math.fma(a, b, math.inf), math.inf)
+ self.assertEqual(math.fma(a, b, -math.inf), -math.inf)
# Infinite result when a*b infinite, c finite.
for b, c in itertools.product(positives, finites):
- self.assertEqual(math.fma(math.inf, b, c), math.inf)
- self.assertEqual(math.fma(-math.inf, b, c), -math.inf)
- self.assertEqual(math.fma(-math.inf, -b, c), math.inf)
- self.assertEqual(math.fma(math.inf, -b, c), -math.inf)
+ with self.subTest(b=b, c=c):
+ self.assertEqual(math.fma(math.inf, b, c), math.inf)
+ self.assertEqual(math.fma(-math.inf, b, c), -math.inf)
+ self.assertEqual(math.fma(-math.inf, -b, c), math.inf)
+ self.assertEqual(math.fma(math.inf, -b, c), -math.inf)
- self.assertEqual(math.fma(b, math.inf, c), math.inf)
- self.assertEqual(math.fma(b, -math.inf, c), -math.inf)
- self.assertEqual(math.fma(-b, -math.inf, c), math.inf)
- self.assertEqual(math.fma(-b, math.inf, c), -math.inf)
+ self.assertEqual(math.fma(b, math.inf, c), math.inf)
+ self.assertEqual(math.fma(b, -math.inf, c), -math.inf)
+ self.assertEqual(math.fma(-b, -math.inf, c), math.inf)
+ self.assertEqual(math.fma(-b, math.inf, c), -math.inf)
# gh-73468: On some platforms, libc fma() doesn't implement IEE 754-2008
# properly: it doesn't use the right sign when the result is zero.
@@ -2770,23 +2776,24 @@ def test_fma_zero_result(self):
# Zero results from exact zero inputs.
for b in nonnegative_finites:
- self.assertIsPositiveZero(math.fma(0.0, b, 0.0))
- self.assertIsPositiveZero(math.fma(0.0, b, -0.0))
- self.assertIsNegativeZero(math.fma(0.0, -b, -0.0))
- self.assertIsPositiveZero(math.fma(0.0, -b, 0.0))
- self.assertIsPositiveZero(math.fma(-0.0, -b, 0.0))
- self.assertIsPositiveZero(math.fma(-0.0, -b, -0.0))
- self.assertIsNegativeZero(math.fma(-0.0, b, -0.0))
- self.assertIsPositiveZero(math.fma(-0.0, b, 0.0))
-
- self.assertIsPositiveZero(math.fma(b, 0.0, 0.0))
- self.assertIsPositiveZero(math.fma(b, 0.0, -0.0))
- self.assertIsNegativeZero(math.fma(-b, 0.0, -0.0))
- self.assertIsPositiveZero(math.fma(-b, 0.0, 0.0))
- self.assertIsPositiveZero(math.fma(-b, -0.0, 0.0))
- self.assertIsPositiveZero(math.fma(-b, -0.0, -0.0))
- self.assertIsNegativeZero(math.fma(b, -0.0, -0.0))
- self.assertIsPositiveZero(math.fma(b, -0.0, 0.0))
+ with self.subTest(b=b):
+ self.assertIsPositiveZero(math.fma(0.0, b, 0.0))
+ self.assertIsPositiveZero(math.fma(0.0, b, -0.0))
+ self.assertIsNegativeZero(math.fma(0.0, -b, -0.0))
+ self.assertIsPositiveZero(math.fma(0.0, -b, 0.0))
+ self.assertIsPositiveZero(math.fma(-0.0, -b, 0.0))
+ self.assertIsPositiveZero(math.fma(-0.0, -b, -0.0))
+ self.assertIsNegativeZero(math.fma(-0.0, b, -0.0))
+ self.assertIsPositiveZero(math.fma(-0.0, b, 0.0))
+
+ self.assertIsPositiveZero(math.fma(b, 0.0, 0.0))
+ self.assertIsPositiveZero(math.fma(b, 0.0, -0.0))
+ self.assertIsNegativeZero(math.fma(-b, 0.0, -0.0))
+ self.assertIsPositiveZero(math.fma(-b, 0.0, 0.0))
+ self.assertIsPositiveZero(math.fma(-b, -0.0, 0.0))
+ self.assertIsPositiveZero(math.fma(-b, -0.0, -0.0))
+ self.assertIsNegativeZero(math.fma(b, -0.0, -0.0))
+ self.assertIsPositiveZero(math.fma(b, -0.0, 0.0))
# Exact zero result from nonzero inputs.
self.assertIsPositiveZero(math.fma(2.0, 2.0, -4.0))
@@ -2892,12 +2899,14 @@ def test_random(self):
'0x1.f5467b1911fd6p-2', '0x1.b5cee3225caa5p-1'),
]
for a_hex, b_hex, c_hex, expected_hex in test_values:
- a = float.fromhex(a_hex)
- b = float.fromhex(b_hex)
- c = float.fromhex(c_hex)
- expected = float.fromhex(expected_hex)
- self.assertEqual(math.fma(a, b, c), expected)
- self.assertEqual(math.fma(b, a, c), expected)
+ with self.subTest(a_hex=a_hex, b_hex=b_hex, c_hex=c_hex,
+ expected_hex=expected_hex):
+ a = float.fromhex(a_hex)
+ b = float.fromhex(b_hex)
+ c = float.fromhex(c_hex)
+ expected = float.fromhex(expected_hex)
+ self.assertEqual(math.fma(a, b, c), expected)
+ self.assertEqual(math.fma(b, a, c), expected)
# Custom assertions.
def assertIsNaN(self, value):
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