Larry Hastings added the comment:

So here's the thing.  It only works in Python 3.3 because testtools depends on 
internal implementation details of unittest, specifically a private exception 
("unittest.case._UnexpectedSuccess").  The public interface still works fine.  
So I don't think this is a regression.  If testtools is willing to release 
hacks depending on undocumented internal behavior, I don't think it's 
unreasonable for them to rework their hack to support Python 3.4.

That said, it might be nice to not break testtools if we can avoid it.  
Antoine: would it be reasonable to rework the implementation of subTest in a 
way that permitted us to revert the changes to expectedFailure?

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20687>
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