[issue15273] Remove unnecessarily random behavior from test_unparse.py

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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components: +Tests
nosy: +berker.peksag
stage: needs patch -> patch review
versions: +Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15273>
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