[issue18996] unittest: more helpful truncating long strings

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


----------
assignee:  -> serhiy.storchaka
resolution:  -> fixed
stage: patch review -> committed/rejected
status: open -> closed

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18996>
_______________________________________