[issue21820] unittest: unhelpful truncating of long strings.

[Michael Foord]

Michael Foord added the comment:

I agree that it looks like a bug that this behaviour is triggering for non-strings. There is separate code (which uses maxDiff) for comparing collections. 

Switching off the behaviour for 3.4 / 2.7 and a new class attribute for 3.5 is a good approach.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21820>
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