diff options
Diffstat (limited to 'Lib')
| -rw-r--r-- | Lib/test/test_complex.py | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Lib/test/test_complex.py b/Lib/test/test_complex.py index 3035c2d..64297e2 100644 --- a/Lib/test/test_complex.py +++ b/Lib/test/test_complex.py @@ -9,6 +9,7 @@ warnings.filterwarnings( ) from random import random +from math import atan2 # These tests ensure that complex math does the right thing @@ -225,6 +226,18 @@ class ComplexTest(unittest.TestCase): self.assertAlmostEqual(complex(real=17+23j, imag=23), 17+46j) self.assertAlmostEqual(complex(real=1+2j, imag=3+4j), -3+5j) + # check that the sign of a zero in the real or imaginary part + # is preserved when constructing from two floats. (These checks + # are harmless on systems without support for signed zeros.) + def split_zeros(x): + """Function that produces different results for 0. and -0.""" + return atan2(x, -1.) + + self.assertEqual(split_zeros(complex(1., 0.).imag), split_zeros(0.)) + self.assertEqual(split_zeros(complex(1., -0.).imag), split_zeros(-0.)) + self.assertEqual(split_zeros(complex(0., 1.).real), split_zeros(0.)) + self.assertEqual(split_zeros(complex(-0., 1.).real), split_zeros(-0.)) + c = 3.14 + 1j self.assert_(complex(c) is c) del c |