[issue18919] Unify audio modules tests

[R. David Murray]

R. David Murray added the comment:

In 2.7 unexpected output is a test failure, yes.

In 3.x we removed that check.  But I wonder if that was wise :)  (We did it for technical reasons when adding other features to regrtest).

Yes, using captured_stdout and checking for the expected warnings would be a better test, IMO.

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