// 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) {

					}
				}
			} else {
				// short circuit in non-discovery error cases or if discovery returned zero resources
				return
			}
		}

		logger := klog.FromContext(ctx)

		// Decide whether discovery has reported a change.
		if reflect.DeepEqual(oldResources, newResources) {
			logger.V(4).Info("no resource updates from discovery, skipping resource quota sync")
			return
		}

import org.junit.platform.engine.TestDescriptor;
import org.junit.platform.engine.TestEngine;
import org.junit.platform.engine.UniqueId;
import org.junit.platform.engine.discovery.ClassSelector;
import org.junit.platform.engine.discovery.DiscoverySelectors;
import org.junit.platform.engine.discovery.UniqueIdSelector;
import org.junit.platform.engine.support.descriptor.EngineDescriptor;
import org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine;

			metrics.GarbageCollectorResourcesSyncError.Inc()
			return
		}
		if groupLookupFailures, isLookupFailure := discovery.GroupDiscoveryFailedErrorGroups(err); isLookupFailure {
			// In partial discovery cases, preserve existing synced informers for resources in the failed groups, so resyncMonitors will only add informers for newly seen resources
			for k, v := range oldResources {

type DeltaDiscoveryStream = discovery.AggregatedDiscoveryService_DeltaAggregatedResourcesServer

// DiscoveryClient is a client interface for XDS.
type DiscoveryClient = discovery.AggregatedDiscoveryService_StreamAggregatedResourcesClient

// DeltaDiscoveryClient is a client interface for Delta XDS.
type DeltaDiscoveryClient = discovery.AggregatedDiscoveryService_DeltaAggregatedResourcesClient

						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{

	c := &restclient.Config{
		Host:          server.URL,
		APIPath:       "/api",
		ContentConfig: restclient.ContentConfig{NegotiatedSerializer: legacyscheme.Codecs},
	}
	discover := discovery.NewDiscoveryClientForConfigOrDie(c).WithLegacy()
	_, all, err := discover.ServerGroupsAndResources()
	if err != nil {
		t.Error(err)
	}
	var count int
	apiResources := sets.NewString()
	for _, g := range all {

			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,