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tests: add a comment in a test that will hopefully save someone some time

Authored by spectral.

Description

tests: add a comment in a test that will hopefully save someone some time

I spent at least an hour, probably closer to 1.5, trying to figure out what this
was complaining about. Hopefully anyone else in my position will see this note
and not waste the time.

Differential Revision: https://phab.mercurial-scm.org/D9953