Add an explicit test to catch changes in checksumming calculations.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 38ce06c37e9cc8fec9125262b129602c2274f344
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-03-08T19:09:14Z
Releases: 13.0
Add an explicit test to catch changes in checksumming calculations.

Seems like a good idea in view of 006517432 and addd034ae.

Michael Paquier, Tom Lane

Discussion: https://postgr.es/m/20200306075230.GA118430@paquier.xyz

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