[issue25130] Make tests more PyPy compatible

[Carl Friedrich Bolz-Tereick]

Change by Carl Friedrich Bolz-Tereick <cfbolz at gmx.de>:


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nosy: +Carl.Friedrich.Bolz
nosy_count: 6.0 -> 7.0
pull_requests: +26460
pull_request: https://github.com/python/cpython/pull/28002

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25130>
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