[issue16739] texttestresult should decorate the stream with _WritelnDecorator

[Serhiy Storchaka]

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


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versions: +Python 3.10, Python 3.6, Python 3.7, Python 3.8, Python 3.9 -Python 2.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue16739>
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