[issue19592] Use specific asserts in lib2to3 tests

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

It will be easier to backport fixes if tests are consistent.

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assignee:  -> serhiy.storchaka
resolution:  -> fixed
stage: patch review -> committed/rejected
status: open -> closed
versions: +Python 2.7, Python 3.3

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<http://bugs.python.org/issue19592>
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