crypto/sha512: add tests for Size() and BlockSize()
crypto/sha512: add tests for Size() and BlockSize()

R=golang-codereviews, bradfitz, dave
CC=golang-codereviews
https://codereview.appspot.com/43550047

Committer: Dave Cheney <bfcdf3e6ca6cef45543bfbb57509c92aec9a39fb@cheney.net>

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