resurrecting Looper unit test
It was found in https://gitlab.cern.ch/paconnor/ProtoDarwin/-/merge_requests/29 that the unit test for Loopers wasn't active anymore. I resurrected and amended it.
It was found in https://gitlab.cern.ch/paconnor/ProtoDarwin/-/merge_requests/29 that the unit test for Loopers wasn't active anymore. I resurrected and amended it.