[issue16234] Implement correct block_size and tests for HMAC-SHA3

[Roundup Robot]

Roundup Robot added the comment:

New changeset 40a1652349e9 by Christian Heimes in branch 'default':
Issue #16234: Modify sha3's block_size method to return NotImplemented.
http://hg.python.org/cpython/rev/40a1652349e9

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nosy: +python-dev

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