diff options
Diffstat (limited to 'Lib/test')
| -rw-r--r-- | Lib/test/test_fractions.py | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/Lib/test/test_fractions.py b/Lib/test/test_fractions.py index 5ad0742..dd51f9b 100644 --- a/Lib/test/test_fractions.py +++ b/Lib/test/test_fractions.py @@ -12,6 +12,11 @@ from pickle import dumps, loads F = fractions.Fraction gcd = fractions.gcd +# decorator for skipping tests on non-IEEE 754 platforms +requires_IEEE_754 = unittest.skipUnless( + float.__getformat__("double").startswith("IEEE"), + "test requires IEEE 754 doubles") + class DummyFloat(object): """Dummy float class for testing comparisons with Fractions""" @@ -130,13 +135,33 @@ class FractionTest(unittest.TestCase): self.assertRaisesMessage(ZeroDivisionError, "Fraction(12, 0)", F, 12, 0) - self.assertRaises(TypeError, F, 1.5) self.assertRaises(TypeError, F, 1.5 + 3j) self.assertRaises(TypeError, F, "3/2", 3) self.assertRaises(TypeError, F, 3, 0j) self.assertRaises(TypeError, F, 3, 1j) + @requires_IEEE_754 + def testInitFromFloat(self): + self.assertEquals((5, 2), _components(F(2.5))) + self.assertEquals((0, 1), _components(F(-0.0))) + self.assertEquals((3602879701896397, 36028797018963968), + _components(F(0.1))) + self.assertRaises(TypeError, F, float('nan')) + self.assertRaises(TypeError, F, float('inf')) + self.assertRaises(TypeError, F, float('-inf')) + + def testInitFromDecimal(self): + self.assertEquals((11, 10), + _components(F(Decimal('1.1')))) + self.assertEquals((7, 200), + _components(F(Decimal('3.5e-2')))) + self.assertEquals((0, 1), + _components(F(Decimal('.000e20')))) + self.assertRaises(TypeError, F, Decimal('nan')) + self.assertRaises(TypeError, F, Decimal('snan')) + self.assertRaises(TypeError, F, Decimal('inf')) + self.assertRaises(TypeError, F, Decimal('-inf')) def testFromString(self): self.assertEquals((5, 1), _components(F("5"))) |