Test for utils list_to_csv().

tests/test_utils.py

@@ -8,3 +8,8 @@ class TweepyUtilsTests(TestCase):
         result = parse_datetime("Wed Aug 27 13:08:45 +0000 2008")
         self.assertEqual(datetime(2008, 8, 27, 13, 8, 45), result)
 
+    def testlist_to_csv(self):
+        self.assertEqual("1,2,3", list_to_csv([1,2,3]))
+        self.assertEqual("bird,tweet,nest,egg",
+                         list_to_csv(["bird", "tweet", "nest", "egg"]))
+