[issue18223] Refactor test_tarfile

[Zachary Ware]

Zachary Ware added the comment:

>Serhiy Storchaka added the comment:
>
>Oh, sorry, I missed issue17689.

That's alright, this is a legitimately different issue that just happens to encompass the purpose of the other. As long as your patch hits all the points mine meant to, I'm not bothered :)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18223>
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