[STF] corrected test case

Applied changes to match the new behavior introduced with commit
09871a3eb6376d7fef8761e84a6deff40c14345c

Change-Id: Ie7662f2196ff9773f7bd99fcbd279bcbd44bbb60
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1684
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>