[issue28822] Fix indices handling in PyUnicode_FindChar

[STINNER Victor]

STINNER Victor added the comment:

Serhiy: I don't think that it's worth it to add a new function to _testcapi to test PyUnicode_FindChar. The implementation of the function seems simple.

At least, I would prefer to only see a few unit tests, not 17 test for this simple function!

I mean "character in str" is already tested by a *lot* of unit tests.

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<http://bugs.python.org/issue28822>
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