// backed by an in-memory config and endpoint Store.
func initDS(t *testing.T) *xds.FakeDiscoveryServer {
	ds := xds.NewFakeDiscoveryServer(t, xds.FakeOptions{})
	sd := ds.MemRegistry
	sd.AddHTTPService("fortio1.fortio.svc.cluster.local", "10.10.10.1", 8081)
	sd.SetEndpoints("fortio1.fortio.svc.cluster.local", "", []*model.IstioEndpoint{
		{
			Address:         "127.0.0.1",
			EndpointPort:    uint32(14056),