private HasConflict(Set<ModuleIdentifier> participants) {
            this.participants = participants;
        }

        @Override
        public void withParticipatingModules(Action<ModuleIdentifier> action) {
            for (ModuleIdentifier participant : participants) {
                action.execute(participant);
            }
        }

        @Override

            conflict = handler.registerCandidate(
                candidate(capability, cs)
            )
        }

        then:
        def actualIds = []
        conflict.withParticipatingModules {
            actualIds << it
        }

        actualIds == expectedIds
    }

    CapabilitiesConflictHandler.Candidate candidate(CapabilityInternal cap, ComponentState co) {