[issue44984] Rewrite test_null_strings in _testcapi

[Serhiy Storchaka]

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


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keywords: +patch
pull_requests: +26362
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/27904

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<https://bugs.python.org/issue44984>
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