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Issue #27427: Additional tests for the math module. Thanks Francisco Couzo.

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This commit is contained in:
Mark Dickinson 2016-09-04 12:29:14 +01:00
parent 85746542ea
commit 31ba1c3de8
2 changed files with 24 additions and 6 deletions
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28
Lib/test/test_math.py
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@ -15,6 +15,7 @@
NAN = float('nan')
INF = float('inf')
NINF = float('-inf')
FLOAT_MAX = sys.float_info.max
# detect evidence of double-rounding: fsum is not always correctly
# rounded on machines that suffer from double rounding.
@ -271,6 +272,8 @@ def testAcos(self):
self.ftest('acos(1)', math.acos(1), 0)
self.assertRaises(ValueError, math.acos, INF)
self.assertRaises(ValueError, math.acos, NINF)
self.assertRaises(ValueError, math.acos, 1 + eps)
self.assertRaises(ValueError, math.acos, -1 - eps)
self.assertTrue(math.isnan(math.acos(NAN)))
def testAcosh(self):
@ -290,6 +293,8 @@ def testAsin(self):
self.ftest('asin(1)', math.asin(1), math.pi/2)
self.assertRaises(ValueError, math.asin, INF)
self.assertRaises(ValueError, math.asin, NINF)
self.assertRaises(ValueError, math.asin, 1 + eps)
self.assertRaises(ValueError, math.asin, -1 - eps)
self.assertTrue(math.isnan(math.asin(NAN)))
def testAsinh(self):
@ -469,6 +474,7 @@ def testDegrees(self):
self.ftest('degrees(pi)', math.degrees(math.pi), 180.0)
self.ftest('degrees(pi/2)', math.degrees(math.pi/2), 90.0)
self.ftest('degrees(-pi/4)', math.degrees(-math.pi/4), -45.0)
self.ftest('degrees(0)', math.degrees(0), 0)
def testExp(self):
self.assertRaises(TypeError, math.exp)
@ -478,6 +484,7 @@ def testExp(self):
self.assertEqual(math.exp(INF), INF)
self.assertEqual(math.exp(NINF), 0.)
self.assertTrue(math.isnan(math.exp(NAN)))
self.assertRaises(OverflowError, math.exp, 1000000)
def testFabs(self):
self.assertRaises(TypeError, math.fabs)
@ -720,6 +727,7 @@ def testHypot(self):
self.assertEqual(math.hypot(INF, NAN), INF)
self.assertEqual(math.hypot(NAN, NINF), INF)
self.assertEqual(math.hypot(NINF, NAN), INF)
self.assertRaises(OverflowError, math.hypot, FLOAT_MAX, FLOAT_MAX)
self.assertTrue(math.isnan(math.hypot(1.0, NAN)))
self.assertTrue(math.isnan(math.hypot(NAN, -2.0)))
@ -773,8 +781,10 @@ def testLog(self):
def testLog1p(self):
self.assertRaises(TypeError, math.log1p)
n= 2**90
self.assertAlmostEqual(math.log1p(n), math.log1p(float(n)))
for n in [2, 2**90, 2**300]:
self.assertAlmostEqual(math.log1p(n), math.log1p(float(n)))
self.assertRaises(ValueError, math.log1p, -1)
self.assertEqual(math.log1p(INF), INF)
@requires_IEEE_754
def testLog2(self):
@ -988,6 +998,7 @@ def testRadians(self):
self.ftest('radians(180)', math.radians(180), math.pi)
self.ftest('radians(90)', math.radians(90), math.pi/2)
self.ftest('radians(-45)', math.radians(-45), -math.pi/4)
self.ftest('radians(0)', math.radians(0), 0)
def testSin(self):
self.assertRaises(TypeError, math.sin)
@ -1017,6 +1028,7 @@ def testSqrt(self):
self.ftest('sqrt(1)', math.sqrt(1), 1)
self.ftest('sqrt(4)', math.sqrt(4), 2)
self.assertEqual(math.sqrt(INF), INF)
self.assertRaises(ValueError, math.sqrt, -1)
self.assertRaises(ValueError, math.sqrt, NINF)
self.assertTrue(math.isnan(math.sqrt(NAN)))
@ -1087,7 +1099,8 @@ def testIsfinite(self):
def testIsnan(self):
self.assertTrue(math.isnan(float("nan")))
self.assertTrue(math.isnan(float("inf")* 0.))
self.assertTrue(math.isnan(float("-nan")))
self.assertTrue(math.isnan(float("inf") * 0.))
self.assertFalse(math.isnan(float("inf")))
self.assertFalse(math.isnan(0.))
self.assertFalse(math.isnan(1.))
@ -1380,7 +1393,8 @@ def test_decimals(self):
decimal_examples = [(Decimal('1.00000001'), Decimal('1.0')),
(Decimal('1.00000001e-20'), Decimal('1.0e-20')),
(Decimal('1.00000001e-100'), Decimal('1.0e-100'))]
(Decimal('1.00000001e-100'), Decimal('1.0e-100')),
(Decimal('1.00000001e20'), Decimal('1.0e20'))]
self.assertAllClose(decimal_examples, rel_tol=1e-8)
self.assertAllNotClose(decimal_examples, rel_tol=1e-9)
@ -1388,8 +1402,10 @@ def test_fractions(self):
# test with Fraction values
from fractions import Fraction
# could use some more examples here!
fraction_examples = [(Fraction(1, 100000000) + 1, Fraction(1))]
fraction_examples = [
(Fraction(1, 100000000) + 1, Fraction(1)),
(Fraction(100000001), Fraction(100000000)),
(Fraction(10**8 + 1, 10**28), Fraction(1, 10**20))]
self.assertAllClose(fraction_examples, rel_tol=1e-8)
self.assertAllNotClose(fraction_examples, rel_tol=1e-9)