New submission from Alexey Izbyshev <izbys...@ispras.ru>:

This is a follow-up of #34454. 'datetime' extension module attempts to encode 
input strings into UTF-8 in several places, which requires special care because 
some valid Python strings can't be represented in UTF-8. It makes sense to add 
more tests for methods dealing with strings.

Note that my PR doesn't attempt to deal with #34481. In cases where behavior 
differs between C and Python datetime impls the tests check only for  absence 
of crashes.

----------
components: Extension Modules
messages: 323964
nosy: belopolsky, izbyshev, p-ganssle, serhiy.storchaka, taleinat
priority: normal
severity: normal
status: open
title: datetime: Tests for potential crashes due to non-UTF-8-encodable strings
type: security
versions: Python 3.6, Python 3.7, Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34482>
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