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Diffstat (limited to 'Lib/test/test_float.py')
| -rw-r--r-- | Lib/test/test_float.py | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py index 11f169054a..9d330403aa 100644 --- a/Lib/test/test_float.py +++ b/Lib/test/test_float.py @@ -121,6 +121,13 @@ class IEEEFormatTestCase(unittest.TestCase): self.assertEquals(pos_pos(), neg_pos()) self.assertEquals(pos_neg(), neg_neg()) + if float.__getformat__("double").startswith("IEEE"): + def test_underflow_sign(self): + import math + # check that -1e-1000 gives -0.0, not 0.0 + self.assertEquals(math.atan2(-1e-1000, -1), math.atan2(-0.0, -1)) + self.assertEquals(math.atan2(float('-1e-1000'), -1), + math.atan2(-0.0, -1)) class ReprTestCase(unittest.TestCase): def test_repr(self): |