[issue18996] unittest: more helpful truncating long strings

[Roundup Robot]

Roundup Robot added the comment:

New changeset a0c687dc0039 by Serhiy Storchaka in branch 'default':
Remove commented out debugging code (remnants of issue #18996).
http://hg.python.org/cpython/rev/a0c687dc0039

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