[issue15083] Rewrite ElementTree tests in a cleaner and safer way

[Serhiy Storchaka]

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


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15083>
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