diff -r 96cdd2532034 Lib/test/test_enum.py
--- a/Lib/test/test_enum.py	Sun Nov 08 11:09:37 2015 +0000
+++ b/Lib/test/test_enum.py	Tue Nov 10 18:39:00 2015 +0100
@@ -227,6 +227,11 @@
         with self.assertRaises(AttributeError):
             Season.SPRING.value = 2
 
+    def test_instance_access(self):
+        Season = self.Season
+        with self.assertRaises(AttributeError):
+            Season.SPRING.SUMMER
+
     def test_changing_member(self):
         Season = self.Season
         with self.assertRaises(AttributeError):