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no idea yet about that one ...
======================================================================
FAIL: test_syntax_error (test.test_code_module.TestInteractiveConsole)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/usr/lib/python3.3/test/test_code_module.py", line 57, in test_syntax_error
 raise AssertionError("No syntax error from console")
AssertionError: No syntax error from console

Can't reproduce with current 3.3 tip.

seen this again in our autopkg tester
https://jenkins.qa.ubuntu.com/view/Utopic/view/AutoPkgTest/job/utopic-adt-python3.4/12/
however now I can't reproduce this locally, and the test succeeds during the build.

I can reproduce this here. In that test, I added the following:
 with open('/tmp/debug', 'w') as f:
 for call in self.stderr.method_calls:
 f.write('call: %s\n' % str(call))
 
This gives:
=========== 8< ============
call: call.write('Python <MagicMock name=\'sys.version\' id=\'140431558254320\'> on <MagicMock name=\'sys.platform\' id=\'140431558262512\'>\nType "help", "copyright", "credits" or "license" for more information.\n(InteractiveConsole)\n')
call: call.write('Traceback (most recent call last):\n')
call: call.write(' File "/usr/lib/python3.4/code.py", line 90, in runcode\n')
call: call.write(' ')
call: call.write('exec(code, self.locals)')
call: call.write('\n')
call: call.write(' File "<console>", line 1, in <module>\n')
call: call.write('NameError')
call: call.write(': ')
call: call.write("name 'undefined' is not defined")
call: call.write('\n')
call: call.write('\n')
=========== 8< ============
Observe that the test checks
 if 'NameError:' in ''.join(call[1]):
but the "NameError" and the ":" are in two different call lines. I don't know how self.stderr.method_calls is built, but this sounds like a race condition/timing or a stdin/out buffering issue? I. e. the original print that produces the "NameError:" certainly does that in two steps; perhaps the testsuite thing that repeatedly read()s on stderr catches these two as separate write()s then?

adding unittest developers

It looks like the simplest fix would be to change "NameError:" to "NameError", as the problem is that they're (sometimes!?) on separate lines.
This still tests what we want to test.

sure, doing this. my follow-up question was if it is necessary to fix anything else in unittest.

New changeset 20db5e9086d4 by doko in branch '3.4':
- Issue #17756: Fix test_code test when run from the installed location.
http://hg.python.org/cpython/rev/20db5e9086d4
New changeset 8885fc2e92b3 by doko in branch 'default':
Merge from 3.4:
http://hg.python.org/cpython/rev/8885fc2e92b3 

not yet closing, to see if there are some stream buffering issues in mock

In the absence of any further issue in over a year, can this be closed?

I'm going to close this since the reported issue has been fixed.
In the test sys.stderr was mocked, and Mock.method_calls simply records the calls done to the mock. Therefore the fact that 'NameError' and ':' were written on sys.stderr on two separate calls to write() is not a problem with mocks.