Added DoesNotUnderstand test

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Class loading sets globals, don't need to do it here. [BACKPORT!]

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Make methods final [BACKPORT!]

Signed-off-by: Stefan Marr <git@stefan-marr.de>