// Create endpoint slice as well
	esps := make([]discovery.EndpointPort, 0)
	for _, name := range portNames {
		n := name // Create a stable reference to take the pointer from
		esps = append(esps, discovery.EndpointPort{Name: &n, Port: &portNum})
	}

	sliceEndpoint := make([]discovery.Endpoint, 0, len(ips))
	for i, ip := range ips {
		sliceEndpoint = append(sliceEndpoint, discovery.Endpoint{
			Addresses: []string{ip},

// limitations under the License.

package xds

import (
	"context"
	"fmt"
	"sort"
	"strconv"
	"sync"
	"time"

	discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
	"github.com/google/uuid"
	"go.uber.org/atomic"
	"golang.org/x/time/rate"
	"google.golang.org/grpc"

	"istio.io/istio/pilot/pkg/autoregistration"

		ClusterID:           "cluster-1",
		DiscoveryController: discovery1,
	}

	registry2 := serviceregistry.Simple{
		ProviderID:          provider.Kubernetes,
		ClusterID:           "cluster-2",
		DiscoveryController: discovery2,
	}

	ctls := NewController(Options{})
	ctls.AddRegistry(registry1)
	ctls.AddRegistry(registry2)

	return ctls, discovery1, discovery2
}

func TestServicesForMultiCluster(t *testing.T) {

{
  "kind": "EndpointSlice",
  "apiVersion": "discovery.k8s.io/v1",
  "metadata": {
    "name": "nameValue",
    "generateName": "generateNameValue",
    "namespace": "namespaceValue",
    "selfLink": "selfLinkValue",
    "uid": "uidValue",
    "resourceVersion": "resourceVersionValue",
    "generation": 7,
    "creationTimestamp": "2008-01-01T01:01:01Z",
    "deletionTimestamp": "2009-01-01T01:01:01Z",
    "deletionGracePeriodSeconds": 10,

addressType: addressTypeValue
apiVersion: discovery.k8s.io/v1
endpoints:
- addresses:
  - addressesValue
  conditions:
    ready: true
    serving: true
    terminating: true
  deprecatedTopology:
    deprecatedTopologyKey: deprecatedTopologyValue
  hints:
    forZones:
    - name: nameValue
  hostname: hostnameValue
  nodeName: nodeNameValue
  targetRef:
    apiVersion: apiVersionValue
    fieldPath: fieldPathValue

{
  "kind": "EndpointSlice",
  "apiVersion": "discovery.k8s.io/v1beta1",
  "metadata": {
    "name": "nameValue",
    "generateName": "generateNameValue",
    "namespace": "namespaceValue",
    "selfLink": "selfLinkValue",
    "uid": "uidValue",
    "resourceVersion": "resourceVersionValue",
    "generation": 7,
    "creationTimestamp": "2008-01-01T01:01:01Z",
    "deletionTimestamp": "2009-01-01T01:01:01Z",
    "deletionGracePeriodSeconds": 10,

addressType: addressTypeValue
apiVersion: discovery.k8s.io/v1beta1
endpoints:
- addresses:
  - addressesValue
  conditions:
    ready: true
    serving: true
    terminating: true
  hints:
    forZones:
    - name: nameValue
  hostname: hostnameValue
  nodeName: nodeNameValue
  targetRef:
    apiVersion: apiVersionValue
    fieldPath: fieldPathValue
    kind: kindValue
    name: nameValue
    namespace: namespaceValue

		fakeclient := apiclient.NewDryRunClientWithOpts(dryRunOpts)
		// As we know the return of Discovery() of the fake clientset is of type *fakediscovery.FakeDiscovery
		// we can convert it to that struct.
		fakeclientDiscovery, ok := fakeclient.Discovery().(*fakediscovery.FakeDiscovery)
		if !ok {
			return nil, errors.New("couldn't set fake discovery's server version")
		}
		// Lastly, set the right server version to be used

						Hints: &discovery.EndpointHints{
							ForZones: []discovery.ForZone{{Name: "zone-a-old"}},
						},
					},
					{
						Hints: &discovery.EndpointHints{
							ForZones: []discovery.ForZone{{Name: "zone-b-old"}},
						},
					},
				},
			},
			newEPS: &discovery.EndpointSlice{
				Endpoints: []discovery.Endpoint{
					{
						Hints: &discovery.EndpointHints{

			initialSlice: &discovery.EndpointSlice{
				ObjectMeta: objMeta,
				Ports:      []discovery.EndpointPort{port443},
				Endpoints:  []discovery.Endpoint{endpoint1, endpoint2},
			},
			updatedSlice: &discovery.EndpointSlice{
				ObjectMeta: objMeta,
				Ports:      []discovery.EndpointPort{port443},
				Endpoints:  []discovery.Endpoint{endpoint1, endpoint2},
			},
			expectChanged: false,