From f9ffccea569d4b65a3c15c8e3ac11e63e8330d3a Mon Sep 17 00:00:00 2001
From: Michael Foord <fuzzyman@voidspace.org.uk>
Date: Sun, 2 May 2010 20:39:42 +0000
Subject: Fix unittest tests to not abuse traceback.format_exception

---
 Lib/unittest/test/test_result.py | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/Lib/unittest/test/test_result.py b/Lib/unittest/test/test_result.py
index 57ac549..ec3fadd 100644
--- a/Lib/unittest/test/test_result.py
+++ b/Lib/unittest/test/test_result.py
@@ -3,6 +3,7 @@ import textwrap
 from StringIO import StringIO
 from test import test_support
 
+import traceback
 import unittest
 
 
@@ -361,6 +362,15 @@ class Test_OldTestResult(unittest.TestCase):
         runner.run(Test('testFoo'))
 
 
+class MockTraceback(object):
+    @staticmethod
+    def format_exception(*_):
+        return ['A traceback']
+
+def restore_traceback():
+    unittest.result.traceback = traceback
+
+
 class TestOutputBuffering(unittest.TestCase):
 
     def setUp(self):
@@ -441,6 +451,9 @@ class TestOutputBuffering(unittest.TestCase):
         return result
 
     def testBufferOutputAddErrorOrFailure(self):
+        unittest.result.traceback = MockTraceback
+        self.addCleanup(restore_traceback)
+
         for message_attr, add_attr, include_error in [
             ('errors', 'addError', True),
             ('failures', 'addFailure', False),
@@ -476,7 +489,7 @@ class TestOutputBuffering(unittest.TestCase):
                 Stderr:
                 bar
             """)
-            expectedFullMessage = 'None\n%s%s' % (expectedOutMessage, expectedErrMessage)
+            expectedFullMessage = 'A traceback%s%s' % (expectedOutMessage, expectedErrMessage)
 
             self.assertIs(test, self)
             self.assertEqual(result._original_stdout.getvalue(), expectedOutMessage)
-- 
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