namespaces, err := namespace.GetAll(t)
	if err != nil {
		return fmt.Errorf("failed retrieving list of namespaces: %v", err)
	}

	// Restrict egress from this namespace to only those endpoints in the same Echos.
	cfg := t.ConfigIstio().New()
	cfg.Eval(ns.Name(), map[string]any{
		"Namespaces": namespaces,
	}, `
apiVersion: networking.istio.io/v1alpha3
kind: Sidecar
metadata:
  name: restrict-to-namespace
spec:

{
  "kind": "Namespace",
  "apiVersion": "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,
    "labels": {

apiVersion: v1
kind: Namespace
metadata:
  annotations:
    annotationsKey: annotationsValue
  creationTimestamp: "2008-01-01T01:01:01Z"
  deletionGracePeriodSeconds: 10
  deletionTimestamp: "2009-01-01T01:01:01Z"
  finalizers:
  - finalizersValue
  generateName: generateNameValue
  generation: 7
  labels:
    labelsKey: labelsValue
  managedFields:
  - apiVersion: apiVersionValue
    fieldsType: fieldsTypeValue
    fieldsV1: {}

SataQiu <******@****.***> 1713430345 +0800

`
		})).
		// Create namespaces first. This way, echo can correctly configure egress to all namespaces.
		SetupParallel(
			namespace.Setup(&echo1NS, namespace.Config{Prefix: "echo1", Inject: true}),
			namespace.Setup(&echo2NS, namespace.Config{Prefix: "echo2", Inject: true}),
			namespace.Setup(&externalNS, namespace.Config{Prefix: "external", Inject: false}),

	// Namespace1 is used as the default namespace for reachability tests and other tests which can reuse the same config for echo instances
	Namespace1 namespace.Instance
	// Namespace2 is used by most authorization test cases within authorization_test.go
	Namespace2 namespace.Instance
	// Namespace3 is used by TestAuthorization_Conditions and there is one C echo instance deployed

			AddFunc: func(obj interface{}) {
				namespace := obj.(*v1.Namespace)
				namespaceController.enqueueNamespace(namespace)
			},
			UpdateFunc: func(oldObj, newObj interface{}) {
				namespace := newObj.(*v1.Namespace)
				namespaceController.enqueueNamespace(namespace)
			},
		},
		resyncPeriod,
	)
	namespaceController.lister = namespaceInformer.Lister()
	namespaceController.listerSynced = namespaceInformer.Informer().HasSynced

	Name        string                      `json:"name"`
	Namespace   string                      `json:"namespace"`
	Annotations map[string]string           `json:"annotations"`
	Spec        *authpb.AuthorizationPolicy `json:"spec"`
}

func (ap *AuthorizationPolicy) NamespacedName() types.NamespacedName {
	return types.NamespacedName{Name: ap.Name, Namespace: ap.Namespace}
}

	lock                sync.RWMutex
	namespaces          kclient.Client[*corev1.Namespace]
	discoveryNamespaces sets.String
	discoverySelectors  []labels.Selector // nil if discovery selectors are not specified, permits all namespaces for discovery
	handlers            []func(added, removed sets.String)
}

func NewDiscoveryNamespacesFilter(
	namespaces kclient.Client[*corev1.Namespace],
	mesh mesh.Watcher,
	stop <-chan struct{},

			namespace.Setup(&externalNS, namespace.Config{Prefix: "external", Inject: false})).
		SetupParallel(
			deployment.Setup(&apps, deployment.Config{
				Namespaces: []namespace.Getter{
					namespace.Future(&echo1NS),
					namespace.Future(&echo2NS),
					namespace.Future(&echo3NS),
				},
				ExternalNamespace: namespace.Future(&externalNS),
			})).
		Run()
}