D14978: Add unit test that checks Format data

[Dominik Haumann]

dhaumann added a reviewer: vkrause.

REPOSITORY
  R216 Syntax Highlighting

REVISION DETAIL
  https://phabricator.kde.org/D14978

To: dhaumann, cullmann, vkrause
Cc: kwrite-devel, kde-frameworks-devel, michaelh, kevinapavew, ngraham, bruns, 
demsking, cullmann, sars, dhaumann