D13952: Honor BUILD_TESTING

[David Faure]

dfaure accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R278 KWindowSystem

REVISION DETAIL
  https://phabricator.kde.org/D13952

To: arojas, dfaure
Cc: asturmlechner, kde-frameworks-devel, michaelh, ngraham, bruns