Eldred Habert 0da216897a Improve tests a little (#1324) ...

* Avoid redirecting error messages in RGBLINK tests

We check that RGBLINK prints nothing to stdout, so all that
would be captured on stdout is a putative failure message.

* Require each RGBLINK test to check error output

Otherwise, you can have a test that just... checks nothing!

* Document how to add tests

Fixes #1300's last remaining item.
Also add `checkdiff` rules to remind us to update that doc if
any of the test driver scripts are updated.

2024-03-03 19:12:29 -05:00

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