[issue17013] Allow waiting on a mock

[Ilya Kulakov]

Change by Ilya Kulakov <kulakov.ilya at gmail.com>:


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nosy: +Ilya.Kulakov
nosy_count: 11.0 -> 12.0
pull_requests: +19958
pull_request: https://github.com/python/cpython/pull/20759

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue17013>
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