Index: src/zope/testing/testrunner/testrunner-debugging.txt
===================================================================
--- src/zope/testing/testrunner/testrunner-debugging.txt	(revision 114739)
+++ src/zope/testing/testrunner/testrunner-debugging.txt	(working copy)
@@ -91,7 +91,9 @@
     ... finally: sys.stdin = real_stdin
     ... # doctest: +NORMALIZE_WHITESPACE +REPORT_NDIFF
     Running zope.testing.testrunner.layer.UnitTests tests:
-    ...
+      Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
+    <BLANKLINE>
+    <BLANKLINE>
     Error in test test_post_mortem_failure1 (sample3.sampletests_d.TestSomething)
     Traceback (most recent call last):
       File ".../unittest.py",  line 252, in debug
@@ -99,13 +101,13 @@
       File "testrunner-ex/sample3/sampletests_d.py",
         line 42, in test_post_mortem_failure1
         self.assertEqual(x, y)
-      File ".../unittest.py", line 302, in failUnlessEqual
+      File "testrunner-ex/sample3/sampletests_d.py", line 22, in assertEqual
         raise self.failureException, \
     AssertionError: 1 != 2
     <BLANKLINE>
     exceptions.AssertionError:
     1 != 2
-    > .../unittest.py(302)failUnlessEqual()
+    > testrunner-ex/sample3/sampletests_d.py(NNN)assertEqual()
     -> ...
     (Pdb) up
     > testrunner-ex/sample3/sampletests_d.py(42)test_post_mortem_failure1()
Index: src/zope/testing/testrunner/testrunner-ex/sample3/sampletests_d.py
===================================================================
--- src/zope/testing/testrunner/testrunner-ex/sample3/sampletests_d.py	(revision 114739)
+++ src/zope/testing/testrunner/testrunner-ex/sample3/sampletests_d.py	(working copy)
@@ -19,6 +19,13 @@
 
 class TestSomething(unittest.TestCase):
 
+    def assertEqual(self, first, second, msg=None):
+        # Copy in the 'failUnlessEqual' implementation from Python 2.6
+        # unittest.py, as the 2.7 version adds an extra stack frame.
+        if not first == second:
+            raise self.failureException, \
+                  (msg or '%r != %r' % (first, second))
+
     def test_set_trace1(self):
         x = 1
         import pdb; pdb.set_trace()