"istio.io/istio/pilot/pkg/model"
	v3 "istio.io/istio/pilot/pkg/xds/v3"
	"istio.io/istio/pkg/test"
)

func NewDeltaAdsTest(t test.Failer, conn *grpc.ClientConn) *DeltaAdsTest {
	test.SetForTest(t, &features.DeltaXds, true)
	return NewDeltaXdsTest(t, conn, func(conn *grpc.ClientConn) (DeltaDiscoveryClient, error) {
		xds := discovery.NewAggregatedDiscoveryServiceClient(conn)
		return xds.DeltaAggregatedResources(context.Background())
	})
}

	clusterIDVar      = env.Register("ISTIO_META_CLUSTER_ID", "", "")
	// Provider for XDS auth, e.g., gcp. By default, it is empty, meaning no auth provider.
	xdsAuthProvider = env.Register("XDS_AUTH_PROVIDER", "", "Provider for XDS auth")

	jwtPolicy = env.Register("JWT_POLICY", jwt.PolicyThirdParty,
		"The JWT validation policy.")

	"google.golang.org/grpc/reflection"

	meshconfig "istio.io/api/mesh/v1alpha1"
	"istio.io/istio/pilot/pkg/model"
	"istio.io/istio/pilot/pkg/xds"
	v3 "istio.io/istio/pilot/pkg/xds/v3"
	testutil "istio.io/istio/pilot/test/util"
	xdsfake "istio.io/istio/pilot/test/xds"
	"istio.io/istio/pilot/test/xdstest"
	"istio.io/istio/pkg/bootstrap"
	"istio.io/istio/pkg/bootstrap/platform"
	"istio.io/istio/pkg/config/mesh"

	"istioNamespace":      env.Register("ISTIOCTL_ISTIONAMESPACE", constants.IstioSystemNamespace, "The istioctl --istioNamespace override"),
	"xds-address":         env.Register("ISTIOCTL_XDS_ADDRESS", "", "The istioctl --xds-address override"),
	"xds-port":            env.Register("ISTIOCTL_XDS_PORT", 15012, "The istioctl --xds-port override"),
	"authority":           env.Register("ISTIOCTL_AUTHORITY", "", "The istioctl --authority override"),

	v3 "istio.io/istio/pilot/pkg/xds/v3"
	"istio.io/istio/pilot/test/xds"
	"istio.io/istio/pilot/test/xdstest"
	"istio.io/istio/pkg/config"
	"istio.io/istio/pkg/config/schema/gvk"
	"istio.io/istio/pkg/ptr"
	"istio.io/istio/pkg/slices"
	"istio.io/istio/pkg/test/util/assert"
	"istio.io/istio/pkg/util/sets"
)

func TestCDS(t *testing.T) {
	s := xds.NewFakeDiscoveryServer(t, xds.FakeOptions{})

{
  "xds_servers": [
    {
      "server_uri": "unix:///etc/istio/XDS",
      "channel_creds": [
        {
          "type": "insecure"
        }
      ],
      "server_features": [
        "xds_v3"
      ]
    }
  ],
  "node": {
    "id": "sidecar~127.0.0.1~pod1.fake-namespace~fake-namespace.svc.cluster.local",
    "metadata": {
      "GENERATOR": "grpc",
      "INSTANCE_IPS": "127.0.0.1",
      "ISTIO_VERSION": "version",

```

#### VMs

Virtual Machine support consists of two controllers.

	"istio.io/istio/pilot/pkg/model"
	"istio.io/istio/pilot/pkg/networking/util"
	v3 "istio.io/istio/pilot/pkg/xds/v3"
	istiolog "istio.io/istio/pkg/log"
	"istio.io/istio/pkg/slices"
	"istio.io/istio/pkg/util/sets"
	"istio.io/istio/pkg/xds"
)

var deltaLog = istiolog.RegisterScope("delta", "delta xds debugging")

func (s *DiscoveryServer) StreamDeltas(stream DeltaDiscoveryStream) error {

	memregistry "istio.io/istio/pilot/pkg/serviceregistry/memory"
	"istio.io/istio/pilot/pkg/serviceregistry/util/xdsfake"
	"istio.io/istio/pilot/pkg/xds"
	"istio.io/istio/pilot/pkg/xds/endpoints"
	v3 "istio.io/istio/pilot/pkg/xds/v3"
	"istio.io/istio/pilot/test/xdstest"
	"istio.io/istio/pkg/adsc"
	"istio.io/istio/pkg/cluster"
	"istio.io/istio/pkg/config"
	"istio.io/istio/pkg/config/constants"

func (s *grpcInstance) newServer(opts ...grpc.ServerOption) grpcServer {
	if s.Port.XDSServer {
		if len(s.Port.XDSTestBootstrap) > 0 {
			opts = append(opts, xds.BootstrapContentsForTesting(s.Port.XDSTestBootstrap))
		}
		epLog.Infof("Using xDS for serverside gRPC on %d", s.Port.Port)
		grpcServer, err := xds.NewGRPCServer(opts...)
		if err != nil {
			return nil
		}
		return grpcServer
	}
	return grpc.NewServer(opts...)
}