The tests directory contains 2 directories: 60_umc/ and 60_umc-system/ It seems that this causes that 60_umc isn't executed at all. Is the name conflicting or isn't the package ucs-test-umc installed?
The problem was that the ucs-test-umc Package did not Provide a ucs-test-module. ucs-test (6.0.37-59): r77833 | Bug #39382: reenable ucs-test-umc
60umc is now part of Jenkins again and reveals already failed tests as can be seen: http://jenkins.knut.univention.de:8080/job/UCS-4.1/job/UCS-4.1-4/job/AutotestJoin/135/SambaVersion=s4,Systemrolle=master/testReport/