commit 4e2a68183bb7997eb28844774915fd77abc83ce5
Author: Robert Collins <rbtcollins@hp.com>
Date:   Thu Oct 30 22:59:23 2014 +1300

    Close #22764: Address gc sensitive tests for other implementations.

diff --git a/Lib/unittest/test/test_assertions.py b/Lib/unittest/test/test_assertions.py
index c349a95..801a773 100644
--- a/Lib/unittest/test/test_assertions.py
+++ b/Lib/unittest/test/test_assertions.py
@@ -1,6 +1,7 @@
 import datetime
 import warnings
 import weakref
+import sys
 import unittest
 from itertools import product
 
@@ -98,6 +99,10 @@ class Test_Assertions(unittest.TestCase):
         else:
             self.fail("assertRaises() didn't let exception pass through")
 
+    @unittest.skipIf(
+        getattr(sys, 'pypy_version_info', None),
+        "pypy doesn't use refcounting."
+        )
     def test_assertRaises_frames_survival(self):
         # Issue #9815: assertRaises should avoid keeping local variables
         # in a traceback alive.
diff --git a/Lib/unittest/test/test_case.py b/Lib/unittest/test/test_case.py
index c4a100c..cc47547 100644
--- a/Lib/unittest/test/test_case.py
+++ b/Lib/unittest/test/test_case.py
@@ -1,5 +1,6 @@
 import contextlib
 import difflib
+import gc
 import pprint
 import pickle
 import re
@@ -1565,6 +1566,7 @@ test case
         for method_name in ('test1', 'test2'):
             testcase = TestCase(method_name)
             testcase.run()
+            gc.collect()
             self.assertEqual(MyException.ninstance, 0)
 
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 7ad9649..fb807c5 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -181,6 +181,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #22764: Address gc sensitive tests for other implementations.
+
 - Issue #22217: Implemented reprs of classes in the zipfile module.
 
 - Issue #18216: gettext now raises an error when a .mo file has an