The tests itself already existed, we were just missing the .mk file

Change-Id: I662eba5d955aa5cbd774dbb3b4c9f9010dc1d7d6
Reviewed-on: https://gerrit.libreoffice.org/22249Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: jan iversen <jani@documentfoundation.org>