{"foo.ns.svc.cluster.local.extra", ""},
		{"xds.istio.io/grpc/lds/inbound/0.0.0.0:1234", ""},
	}

	for _, tc := range cases {
		t.Run(tc.in, func(t *testing.T) {
			if got := tryFindFQDN(tc.in, node); got != tc.want {
				t.Errorf("want %q but got %q", tc.want, got)
			}
		})
	}

		hasPort := err == nil

		// attempt to expand shortname to FQDN
		requestedName := name
		if hasPort {
			requestedName = host
		}
		allNames := []string{requestedName}
		if fqdn := tryFindFQDN(requestedName, node); fqdn != "" {
			allNames = append(allNames, fqdn)
		}

		for _, name := range allNames {
			ln, ok := filter[name]
			if !ok {
				ln = listenerName{RequestedNames: sets.New[string]()}