TestMaxDepth test checks the linear (lin) algorithm such that it arranges
child layout nodes along a linear path.

Change-Id: Ibf6f654d2f68f31a1c1a0f57044b411add954fa0
Reviewed-on: https://gerrit.libreoffice.org/55080Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jan Holesovsky <kendy@collabora.com>