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Some style comments:
- don't use "except: self.fail()", just let the exception pass through
- when monkeypatching hmac.new, use a try...finally block so that the mock doesn't stay in place if the test fails for whatever reason
- it's a bit of a nit, but when using "with warnings.catch_warnings", I would put the asserts on the context manager result outside of the "with" block
- I get a warning in test_noncallable_digestmod, it would be nice to silence it:
/home/antoine/cpython/default/Lib/test/test_hmac.py:254: RuntimeWarning: No block_size attribute on given digest object; Assuming 64.
 h = hmac.HMAC(b"key", b"", hmac)