diff options
Diffstat (limited to 'Lib/test/test_decimal.py')
| -rw-r--r-- | Lib/test/test_decimal.py | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/Lib/test/test_decimal.py b/Lib/test/test_decimal.py index 360a5e8..51bdf9c 100644 --- a/Lib/test/test_decimal.py +++ b/Lib/test/test_decimal.py @@ -52,6 +52,11 @@ def init(): ) setcontext(DefaultTestContext) +# decorator for skipping tests on non-IEEE 754 platforms +requires_IEEE_754 = unittest.skipUnless( + float.__getformat__("double").startswith("IEEE"), + "test requires IEEE 754 doubles") + TESTDATADIR = 'decimaltestdata' if __name__ == '__main__': file = sys.argv[0] @@ -504,6 +509,27 @@ class DecimalExplicitConstructionTest(unittest.TestCase): self.assertEqual(str(e), '0') self.assertNotEqual(id(d), id(e)) + @requires_IEEE_754 + def test_explicit_from_float(self): + r = Decimal(0.1) + self.assertEqual(type(r), Decimal) + self.assertEqual(str(r), + '0.1000000000000000055511151231257827021181583404541015625') + self.assertTrue(Decimal(float('nan')).is_qnan()) + self.assertTrue(Decimal(float('inf')).is_infinite()) + self.assertTrue(Decimal(float('-inf')).is_infinite()) + self.assertEqual(str(Decimal(float('nan'))), + str(Decimal('NaN'))) + self.assertEqual(str(Decimal(float('inf'))), + str(Decimal('Infinity'))) + self.assertEqual(str(Decimal(float('-inf'))), + str(Decimal('-Infinity'))) + self.assertEqual(str(Decimal(float('-0.0'))), + str(Decimal('-0'))) + for i in range(200): + x = random.expovariate(0.01) * (random.random() * 2.0 - 1.0) + self.assertEqual(x, float(Decimal(x))) # roundtrip + def test_explicit_context_create_decimal(self): nc = copy.copy(getcontext()) |