Usually we reply INVALID before we reply UNSUPPORTED but that's only for those
values where the value is a programming error. But in this case it's a bit
more complicated. INVALID is only for the cases where the button doesn't exist
on the device, if we don't have button scrolling at all then we have
UNSUPPORTED for all.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
They weren't originally prefixed but the various tests were, but now that we
only have one test runner binary anyway, the prefix helps sorting the files
easily within e.g. gcov results.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
