AddressType: discoveryv1.AddressTypeIPv4,
		Endpoints: []discoveryv1.Endpoint{{
			Addresses: []string{"1.1.1.1"},
		}, {
			Addresses: []string{"2.2.2.2"},
		}},
		Ports: []discoveryv1.EndpointPort{{Port: ptr.To[int32](80)}},
	}
	endpoints2 := &discoveryv1.EndpointSlice{
		ObjectMeta:  metav1.ObjectMeta{Namespace: "testnamespace", Name: "bar"},
		AddressType: discoveryv1.AddressTypeIPv4,
		Endpoints: []discoveryv1.Endpoint{{

import (
	"context"
	"fmt"
	"sync"
	"time"

	v1 "k8s.io/api/core/v1"
	discoveryv1 "k8s.io/api/discovery/v1"
	networkingv1alpha1 "k8s.io/api/networking/v1alpha1"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	"k8s.io/apimachinery/pkg/util/sets"
	v1informers "k8s.io/client-go/informers/core/v1"
	discoveryv1informers "k8s.io/client-go/informers/discovery/v1"
	networkingv1alpha1informers "k8s.io/client-go/informers/networking/v1alpha1"

func generateEndpointsAndSlice(name, namespace string, ports []int, addresses []string) (*corev1.Endpoints, *discovery.EndpointSlice) {
	trueBool := true

	epSlice := &discovery.EndpointSlice{
		ObjectMeta:  metav1.ObjectMeta{Name: name, Namespace: namespace},
		AddressType: discovery.AddressTypeIPv4,
	}
	epSlice.Labels = map[string]string{discovery.LabelServiceName: name}
	subset := corev1.EndpointSubset{}

	for i, port := range ports {

					Port:     w.port,
					Name:     "http",
					Protocol: corev1.ProtocolTCP,
				}},
			},
		},
		&discoveryv1.EndpointSlice{
			ObjectMeta: baseMeta,
			Endpoints: []discoveryv1.Endpoint{{
				Addresses:  []string{w.ip},
				Conditions: discoveryv1.EndpointConditions{},
				Hostname:   nil,
				TargetRef: &corev1.ObjectReference{
					APIVersion: "v1",
					Kind:       "Pod",

		}
	case gvr.EndpointSlice:
		l = func(options metav1.ListOptions) (runtime.Object, error) {
			return c.Kube().DiscoveryV1().EndpointSlices(opts.Namespace).List(context.Background(), options)
		}
		w = func(options metav1.ListOptions) (watch.Interface, error) {
			return c.Kube().DiscoveryV1().EndpointSlices(opts.Namespace).Watch(context.Background(), options)
		}
	case gvr.Endpoints:

	"k8s.io/apiserver/pkg/endpoints/discovery"
	genericapiserver "k8s.io/apiserver/pkg/server"
	serverstorage "k8s.io/apiserver/pkg/server/storage"
	utilfeature "k8s.io/apiserver/pkg/util/feature"
	clientdiscovery "k8s.io/client-go/discovery"
	"k8s.io/client-go/kubernetes"
	corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
	discoveryclient "k8s.io/client-go/kubernetes/typed/discovery/v1"
	"k8s.io/klog/v2"

	t.Helper()
	fetchedSlices, err := client.DiscoveryV1().EndpointSlices(namespace).List(context.TODO(), metav1.ListOptions{
		LabelSelector: discovery.LabelManagedBy + "=" + controllerName,
	})
	if err != nil {
		t.Fatalf("Expected no error fetching Endpoint Slices, got: %v", err)
		return []discovery.EndpointSlice{}
	}
	return fetchedSlices.Items

// 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"

	"istio.io/istio/pkg/log"
	"istio.io/istio/pkg/maps"
	"istio.io/istio/pkg/slices"
	"istio.io/istio/pkg/util/sets"
	"istio.io/istio/pkg/workloadapi"
)

// ServiceDiscovery is a mock discovery interface
type ServiceDiscovery struct {
	services map[host.Name]*model.Service

	handlers model.ControllerHandlers

	networkGateways []model.NetworkGateway
	model.NetworkGatewaysHandler

		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) {