Where to place the unit test?

[Regina Henschel]

Hi all,

I have added a unit test in https://gerrit.libreoffice.org/c/core/+/190622
But I'm not really happy with the location. The test doesn't include 
anything about filters. Starting a new test suite? Or where to place it? 
The test uses createScDoc(), getScDoc() and getScDoShell() from 
ScModelTestBase.

Kind regards,
Regina