[issue19925] Add unit test for spwd module

[Serhiy Storchaka]

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


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assignee:  -> serhiy.storchaka
nosy: +serhiy.storchaka
type:  -> enhancement
versions: +Python 2.7, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19925>
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