TEST: Improve coverage of transys.labeled_graphs; unlabeled stuff
TEST: Improve coverage of transys.labeled_graphs; unlabeled stuff

necozay/tulip-control,tulip-control/tulip-control,necozay/tulip-control,necozay/tulip-control,tulip-control/tulip-control,necozay/tulip-control,tulip-control/tulip-control,tulip-control/tulip-control,necozay/tulip-control