[issue11468] Improve unittest basic example in the doc

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I think there’s value in accepting the current patch as really basic example, and then see if the section about setting up and tearing down also has a very simple example.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11468>
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