Serhiy Storchaka added the comment:
I think it is nice to add tests for C API. Especially if there is no direct
mapping between Python and C API ("character in str" don't call
PyUnicode_FindChar()). Tests should cover all corner cases, otherwise we can
miss bugs. Some C API can be not used in CPython at all, just in third-party
extensions, and special tests is the only way to test them. The implementation
of PyUnicode_FindChar() is not so simple (for example see issue24821).
I don't have an opinion about supporting negative indices.
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<http://bugs.python.org/issue28822>
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