public DefaultServiceRegistry() {
        this(null, NO_PARENTS);
    }

    public DefaultServiceRegistry(String displayName) {
        this(displayName, NO_PARENTS);
    }

    public DefaultServiceRegistry(ServiceRegistry... parents) {
        this(null, parents);
    }

    public DefaultServiceRegistry(@Nullable String displayName, ServiceRegistry... parents) {

        def root = new DefaultServiceRegistry()
        root.add(String, "root")
        def parent1 = new DefaultServiceRegistry(root)
        parent1.add(String, "p1")
        def parent2 = new DefaultServiceRegistry(root)
        parent2.add(String, "p2")
        def registry = new DefaultServiceRegistry(parent1, parent2)

        expect:

        DependencyManagementServices dms = getServices().get(DependencyManagementServices.class);
        InstantiatorFactory instantiatorFactory = services.get(InstantiatorFactory.class);
        DefaultServiceRegistry lookup = new DefaultServiceRegistry(services);
        lookup.addProvider(new ServiceRegistrationProvider() {
            @Provides
            public DependencyResolutionServices createServices() {

    private <T> T newInstance(Class<T> clazz, Object... args) throws Exception {
        DefaultServiceRegistry services = new DefaultServiceRegistry();
        services.add(InstantiatorFactory.class, TestUtil.instantiatorFactory());
        return newInstance(clazz, services, args);
    }