Don't test Decimal(float) for python 2.6

tests/unit/test_marshalling.py

@@ -11,6 +11,8 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import sys
+
 from cassandra.marshal import bitlength
 from cassandra.protocol import MAX_SUPPORTED_VERSION
 
@@ -25,7 +27,7 @@ from decimal import Decimal
 from uuid import UUID
 
 from cassandra.cqltypes import lookup_casstype, DecimalType, UTF8Type, DateType
-from cassandra.util import OrderedMap, OrderedMapSerializedKey, sortedset, Time, Date
+from cassandra.util import OrderedMapSerializedKey, sortedset, Time, Date
 
 marshalled_value_pairs = (
     # binary form, type, python native type
@@ -143,8 +145,18 @@ class UnmarshalTest(unittest.TestCase):
 
     def test_decimal(self):
         # testing implicit numeric conversion
-        # int, float, tuple(sign, digits, exp)
+        # int, tuple(sign, digits, exp), float
+        converted_types = (10001, (0, (1, 0, 0, 0, 0, 1), -3), 100.1)
+
+        if sys.version_info < (2, 7):
+            # Decimal in Python 2.6 does not accept floats for lossless initialization
+            # Just verifying expected exception here
+            f = converted_types[-1]
+            self.assertIsInstance(f, float)
+            self.assertRaises(TypeError, DecimalType.to_binary, f, MAX_SUPPORTED_VERSION)
+            converted_types = converted_types[:-1]
+
         for proto_ver in range(1, MAX_SUPPORTED_VERSION + 1):
-            for n in (10001, 100.1, (0, (1, 0, 0, 0, 0, 1), -3)):
+            for n in converted_types:
                 expected = Decimal(n)
                 self.assertEqual(DecimalType.from_binary(DecimalType.to_binary(n, proto_ver), proto_ver), expected)