xdsUpdater := opts.XDSUpdater
	var endpoints *model.EndpointIndex
	if xdsUpdater == nil {
		endpoints = model.NewEndpointIndex(model.DisabledCache{})
		delegate := model.NewEndpointIndexUpdater(endpoints)
		xdsUpdater = xdsfake.NewWithDelegate(delegate)
	}

	domainSuffix := defaultFakeDomainSuffix
	if opts.DomainSuffix != "" {
		domainSuffix = opts.DomainSuffix
	}
	if opts.Client == nil {