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Diffstat (limited to 'Lib/test/test_float.py')
| -rw-r--r-- | Lib/test/test_float.py | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py index fd8436a..6d90637 100644 --- a/Lib/test/test_float.py +++ b/Lib/test/test_float.py @@ -231,6 +231,26 @@ class GeneralFloatCases(unittest.TestCase): self.assertTrue(d == d, "{%r : None} not equal to itself" % f) + @requires_IEEE_754 + def test_float_mod(self): + # Check behaviour of % operator for IEEE 754 special cases. + # In particular, check signs of zeros. + mod = operator.mod + + self.assertEqualAndEqualSign(mod(-1.0, 1.0), 0.0) + self.assertEqualAndEqualSign(mod(-1e-100, 1.0), 1.0) + self.assertEqualAndEqualSign(mod(-0.0, 1.0), 0.0) + self.assertEqualAndEqualSign(mod(0.0, 1.0), 0.0) + self.assertEqualAndEqualSign(mod(1e-100, 1.0), 1e-100) + self.assertEqualAndEqualSign(mod(1.0, 1.0), 0.0) + + self.assertEqualAndEqualSign(mod(-1.0, -1.0), -0.0) + self.assertEqualAndEqualSign(mod(-1e-100, -1.0), -1e-100) + self.assertEqualAndEqualSign(mod(-0.0, -1.0), -0.0) + self.assertEqualAndEqualSign(mod(0.0, -1.0), -0.0) + self.assertEqualAndEqualSign(mod(1e-100, -1.0), -1.0) + self.assertEqualAndEqualSign(mod(1.0, -1.0), -0.0) + class FormatFunctionsTestCase(unittest.TestCase): |