From 2ec8cbc75fb6482aa00f998d53a39a812d1e34bc Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Fri, 25 Feb 2011 14:05:42 +0000
Subject: [PATCH] rewrite with assertIs

---
 Lib/test/list_tests.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Lib/test/list_tests.py b/Lib/test/list_tests.py
index 89ea40f7800..0c656fd098b 100644
--- a/Lib/test/list_tests.py
+++ b/Lib/test/list_tests.py
@@ -461,9 +461,8 @@ def test_copy(self):
         # test that it's a shallow, not a deep copy
         u = self.type2test([1, 2, [3, 4], 5])
         v = u.copy()
-        v[2].append(666)
-        self.assertEqual(u, [1, 2, [3, 4, 666], 5])
         self.assertEqual(u, v)
+        self.assertIs(v[3], u[3])
 
         self.assertRaises(TypeError, u.copy, None)