R. David Murray added the comment:

What I usually do in cases like this is to add the tests but mark them with 
comments saying that the tests test current behavior but are not testing parts 
of the (currently defined) API.  That way you know if a change changes behavior 
and then can decide if that is a problem or not, as opposed to inadvertently 
changing behavior and only finding out when the bug reports roll in :)

But yeah, defining the rules textwrap should follow is a different issue than 
the performance issue.

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<http://bugs.python.org/issue22687>
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