Add an extra testcase.

Lib/test/test_itertools.py

@@ -2,6 +2,7 @@ import unittest
 from test import support
 from itertools import *
 from weakref import proxy
+from decimal import Decimal
 import sys
 import operator
 import random
@@ -356,6 +357,8 @@ class TestBasicOps(unittest.TestCase):
         self.assertEqual(take(20, count(maxsize-15, 3)), take(20, range(maxsize-15, maxsize+100, 3)))
         self.assertEqual(take(20, count(-maxsize-15, 3)), take(20, range(-maxsize-15,-maxsize+100, 3)))
         self.assertEqual(take(3, count(2, 3.25-4j)), [2, 5.25-4j, 8.5-8j])
+        self.assertEqual(take(3, count(Decimal('1.1'), Decimal('.1'))),
+                         [Decimal('1.1'), Decimal('1.2'), Decimal('1.3')])
         self.assertEqual(repr(take(3, count(10, 2.5))), repr([10, 12.5, 15.0]))
         c = count(3, 5)
         self.assertEqual(repr(c), 'count(3, 5)')