Update tests

Author: eendebakpt

Lib/test/test_copy.py

@@ -429,19 +429,22 @@ def test_deepcopy_reflexive_dict(self):
 
     def test_deepcopy_keepalive(self):
         memo = {}
+        memo[id(memo)] = []
         x = []
         y = copy.deepcopy(x, memo)
         self.assertIs(memo[id(memo)][0], x)
 
     def test_deepcopy_dont_memo_immutable(self):
         memo = {}
+        memo[id(memo)] = []
         x = [1, 2, 3, 4]
         y = copy.deepcopy(x, memo)
         self.assertEqual(y, x)
         # There's the entry for the new list, and the keep alive.
         self.assertEqual(len(memo), 2)
 
         memo = {}
+        memo[id(memo)] = []
         x = [(1, 2)]
         y = copy.deepcopy(x, memo)
         self.assertEqual(y, x)