refactor server faking for unit tests into own file; re #4329

git-svn-id: svn://develop.studip.de/studip/trunk@31777 c5b85792-5220-0410-ad23-ed5b6b8ad999
simple unit test for link cassification with htmlpurifier; re 4329

git-svn-id: svn://develop.studip.de/studip/trunk@31778 c5b85792-5220-0410-ad23-ed5b6b8ad999