fuzzy: Fix decimal.FloatOperation warning (Closes #261)

Under Python 2.7+, the previous versions was directly casting fuzzy
Decimal values into a float, which led to warnings in code trying to
avoid such conversions in its tested code.

Since we're just building random values, that behavior led to false
positives or required jumping through weird hoops whenever a
FuzzyDecimal was used.

We now go trough a ``str()`` call to avoid such warnings.

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/test_fuzzy.py b/tests/test_fuzzy.py
index 3f9c434..d83f3dd 100644
--- a/tests/test_fuzzy.py
+++ b/tests/test_fuzzy.py
@@ -189,6 +189,18 @@ class FuzzyDecimalTestCase(unittest.TestCase):
 
         self.assertEqual(decimal.Decimal('8.001').quantize(decimal.Decimal(10) ** -3), res)
 
+    def test_no_approximation(self):
+        """We should not go through floats in our fuzzy calls unless actually needed."""
+        fuzz = fuzzy.FuzzyDecimal(0, 10)
+
+        decimal_context = decimal.getcontext()
+        old_traps = decimal_context.traps[decimal.FloatOperation]
+        try:
+            decimal_context.traps[decimal.FloatOperation] = True
+            fuzz.evaluate(2, None, None)
+        finally:
+            decimal_context.traps[decimal.FloatOperation] = old_traps
+
 
 class FuzzyDateTestCase(unittest.TestCase):
     @classmethod