[issue30839] Larger and/or configurable _MAX_LENGTH for unittest messages

[R. David Murray]

R. David Murray added the comment:

Yes, setting _MAX_LENGTH can be an independent feature request.  

The default will not be changed, however, since it is the most useful default given that assertEquals in general produces a much more useful diff output in addition to the one-line summary.  You might also/alternatively want to look in to providing your own assertEqual extension to produce a useful diff of your particular data structure.

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dependencies: +Unittest truncating of error message not works
nosy: +r.david.murray
versions: +Python 3.7 -Python 3.4

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<http://bugs.python.org/issue30839>
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