given:
        registry.add(TestCloseService, service)

        when:
        registry.close()

        then:
        1 * service.close()
    }

    def closeInvokesStopMethodOnEachService() {
        def service = Mock(TestStopService)

        given:
        registry.add(TestStopService, service)

        when:
        registry.close()

        then: