[issue18996] unittest: more helpful truncating long strings

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5bb83faa8818 by Serhiy Storchaka in branch 'default':
Issue #18996: TestCase.assertEqual() now more cleverly shorten differing
http://hg.python.org/cpython/rev/5bb83faa8818

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nosy: +python-dev

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<http://bugs.python.org/issue18996>
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