diff options
Diffstat (limited to 'Lib/test/test_math.py')
| -rw-r--r-- | Lib/test/test_math.py | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py index 913a60bf9e0..46cb54647b1 100644 --- a/Lib/test/test_math.py +++ b/Lib/test/test_math.py @@ -475,6 +475,19 @@ class MathTests(unittest.TestCase): # similarly, copysign(2., NAN) could be 2. or -2. self.assertEqual(abs(math.copysign(2., NAN)), 2.) + def test_signbit(self): + self.assertRaises(TypeError, math.signbit) + self.assertRaises(TypeError, math.signbit, '1.0') + + # C11, ยง7.12.3.6 requires signbit() to return a nonzero value + # if and only if the sign of its argument value is negative, + # but in practice, we are only interested in a boolean value. + self.assertIsInstance(math.signbit(1.0), bool) + + for arg in [0., 1., INF, NAN]: + self.assertFalse(math.signbit(arg)) + self.assertTrue(math.signbit(-arg)) + def testCos(self): self.assertRaises(TypeError, math.cos) self.ftest('cos(-pi/2)', math.cos(-math.pi/2), 0, abs_tol=math.ulp(1)) @@ -1214,6 +1227,12 @@ class MathTests(unittest.TestCase): self.assertEqual(math.ldexp(NINF, n), NINF) self.assertTrue(math.isnan(math.ldexp(NAN, n))) + @requires_IEEE_754 + def testLdexp_denormal(self): + # Denormal output incorrectly rounded (truncated) + # on some Windows. + self.assertEqual(math.ldexp(6993274598585239, -1126), 1e-323) + def testLog(self): self.assertRaises(TypeError, math.log) self.assertRaises(TypeError, math.log, 1, 2, 3) @@ -1381,7 +1400,6 @@ class MathTests(unittest.TestCase): args = ((-5, -5, 10), (1.5, 4611686018427387904, 2305843009213693952)) self.assertEqual(sumprod(*args), 0.0) - @requires_IEEE_754 @unittest.skipIf(HAVE_DOUBLE_ROUNDING, "sumprod() accuracy not guaranteed on machines with double rounding") @@ -1967,6 +1985,28 @@ class MathTests(unittest.TestCase): self.assertFalse(math.isfinite(float("inf"))) self.assertFalse(math.isfinite(float("-inf"))) + def testIsnormal(self): + self.assertTrue(math.isnormal(1.25)) + self.assertTrue(math.isnormal(-1.0)) + self.assertFalse(math.isnormal(0.0)) + self.assertFalse(math.isnormal(-0.0)) + self.assertFalse(math.isnormal(INF)) + self.assertFalse(math.isnormal(NINF)) + self.assertFalse(math.isnormal(NAN)) + self.assertFalse(math.isnormal(FLOAT_MIN/2)) + self.assertFalse(math.isnormal(-FLOAT_MIN/2)) + + def testIssubnormal(self): + self.assertFalse(math.issubnormal(1.25)) + self.assertFalse(math.issubnormal(-1.0)) + self.assertFalse(math.issubnormal(0.0)) + self.assertFalse(math.issubnormal(-0.0)) + self.assertFalse(math.issubnormal(INF)) + self.assertFalse(math.issubnormal(NINF)) + self.assertFalse(math.issubnormal(NAN)) + self.assertTrue(math.issubnormal(FLOAT_MIN/2)) + self.assertTrue(math.issubnormal(-FLOAT_MIN/2)) + def testIsnan(self): self.assertTrue(math.isnan(float("nan"))) self.assertTrue(math.isnan(float("-nan"))) @@ -2458,7 +2498,6 @@ class MathTests(unittest.TestCase): with self.assertRaises(ValueError): math.nextafter(1.0, INF, steps=-1) - @requires_IEEE_754 def test_ulp(self): self.assertEqual(math.ulp(1.0), sys.float_info.epsilon) |