diff options
Diffstat (limited to 'Lib/test/test_cmath.py')
| -rw-r--r-- | Lib/test/test_cmath.py | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/Lib/test/test_cmath.py b/Lib/test/test_cmath.py index a8033635ec..e3cf03e1ad 100644 --- a/Lib/test/test_cmath.py +++ b/Lib/test/test_cmath.py @@ -1,8 +1,9 @@ from test.support import run_unittest -from test.test_math import parse_testfile, test_file +from test.test_math import parse_testfile, test_file, requires_IEEE_754 import unittest import cmath, math from cmath import phase, polar, rect, pi +import sysconfig INF = float('inf') NAN = float('nan') @@ -61,6 +62,12 @@ class CMathTests(unittest.TestCase): def tearDown(self): self.test_values.close() + def assertComplexIdentical(self, a, b): + """Fail if two complex numbers value or sign is different.""" + self.assertEqual(a, b) + self.assertEqual(math.copysign(1., a.real), math.copysign(1., b.real)) + self.assertEqual(math.copysign(1., a.imag), math.copysign(1., b.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. @@ -473,6 +480,15 @@ class CMathTests(unittest.TestCase): self.assertTrue(cmath.isinf(complex(NAN, INF))) self.assertTrue(cmath.isinf(complex(INF, NAN))) + @requires_IEEE_754 + @unittest.skipIf(sysconfig.get_config_var('TANH_PRESERVES_ZERO_SIGN') == 0, + "system tanh() function doesn't copy the sign") + def testTanhSign(self): + self.assertComplexIdentical(cmath.tanh(complex(0., .0j)), complex(0., .0j)) + self.assertComplexIdentical(cmath.tanh(complex(0., -.0j)), complex(0., -.0j)) + self.assertComplexIdentical(cmath.tanh(complex(-0., .0j)), complex(-0., .0j)) + self.assertComplexIdentical(cmath.tanh(complex(-0., -.0j)), complex(-0., -.0j)) + def test_main(): run_unittest(CMathTests) |