) (*discovery.DiscoveryResponse, error) {
		return &discovery.DiscoveryResponse{}, nil
	}
	t.Cleanup(func() {
		multixds.GetXdsResponse = xds.GetXdsResponse
	})

	for i, c := range cases {
		t.Run(fmt.Sprintf("case %d %s", i, strings.Join(c.args, " ")), func(t *testing.T) {