ctest doesn't work properly.
The binaries always return 0, thus no failure is detected. See https://www.ibm.com/support/knowledgecenter/en/SSAT4T_16.1.1/com.ibm.xlf1611.lelinux.doc/language_ref/error_stop.html for a possible way to return an exit code -> Requires getting the number of failures from fruit.