How to deal with dpi-dependent values in unit tests?

[Regina Henschel]

Hi all,

the values of the bound rectangle of a Fontwork shape are dpi dependent 
(I don't know why). I could increase the tolerance to cover more dpi 
settings as done in https://gerrit.libreoffice.org/c/core/+/123613 or I add
     if (!IsDefaultDPI()) return;
as done in https://gerrit.libreoffice.org/c/core/+/123512

What is the preferred way to handle it?

Kind regards
Regina