[issue35917] multiprocessing: provide unit-tests for manager classes and shareable types

[Giampaolo Rodola']

Change by Giampaolo Rodola' <g.rodola at gmail.com>:


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keywords: +patch, patch
pull_requests: +11740, 11741

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35917>
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