items := strings.SplitN(proxyLocality, "/", 3)
	region, zone, subzone := items[0], items[1], items[2]
	for _, ep := range eps {
		if ep.GetLocality().Region == region {
			if ep.GetLocality().Zone == zone {
				if ep.GetLocality().SubZone == subzone {
					if ep.GetPriority() != 0 {

			localities: []string{"a/b", "a/b/c"},
			valid:      false,
		},
		{
			name:       "explicit wildcard subzone overlap",
			localities: []string{"a/b/*", "a/b/c"},
			valid:      false,
		},
		{
			name:       "implicit wildcard subzone overlap",
			localities: []string{"a/b", "a/b/c"},
			valid:      false,
		},
		{
			name:       "valid localities",

			runtimeFlags[k] = v
		}
	}
	return runtimeFlags
}

func getLocalityOptions(l *core.Locality) []option.Instance {
	return []option.Instance{option.Region(l.Region), option.Zone(l.Zone), option.SubZone(l.SubZone)}
}

func getServiceCluster(metadata *model.BootstrapNodeMetadata) string {
	switch name := metadata.ProxyConfig.ClusterName.(type) {
	case *meshAPI.ProxyConfig_ServiceCluster:

func LocalityToString(l *core.Locality) string {
	if l == nil {
		return ""
	}
	resp := l.Region
	if l.Zone == "" {
		return resp
	}
	resp += "/" + l.Zone
	if l.SubZone == "" {
		return resp
	}
	resp += "/" + l.SubZone
	return resp
}

// GetFailoverPriorityLabels returns a byte array which contains failover priorities of the proxy.

	zone := getLabelValue(node.ObjectMeta, NodeZoneLabelGA, NodeZoneLabel)
	subzone := getLabelValue(node.ObjectMeta, label.TopologySubzone.Name, "")

	if region == "" && zone == "" && subzone == "" {
		return ""
	}

	return region + "/" + zone + "/" + subzone // Format: "%s/%s/%s"
}

					Labels: map[string]string{
						"app":                           "wle",
						"topology.kubernetes.io/region": "region1",
						"topology.kubernetes.io/zone":   "zone1",
						"topology.istio.io/subzone":     "subzone1",
						"topology.istio.io/network":     "network1",
						"topology.istio.io/cluster":     clusterID,
					},
					Address: "1.1.1.1",
					Network: "network1",
					Locality: model.Locality{

	a := echo.Config{
		Service:                 ASvc,
		ServiceAccount:          true,
		Ports:                   ports.All(),
		Subsets:                 []echo.SubsetConfig{{}},
		Locality:                "region.zone.subzone",
		IncludeExtAuthz:         c.IncludeExtAuthz,
		DisableAutomountSAToken: disableAutomountSAToken,
	}

	b := echo.Config{
		Service:         BSvc,
		ServiceAccount:  true,
		Ports:           ports.All(),

		},
		{
			testName: "zone",
			key:      "zone",
			option:   option.Zone("fake"),
			expected: "fake",
		},
		{
			testName: "sub zone",
			key:      "sub_zone",
			option:   option.SubZone("fake"),
			expected: "fake",
		},
		{
			testName: "node metadata nil",
			key:      "meta_json_str",
			option:   option.NodeMetadata(nil, nil),
			expected: nil,
		},
		{

	// the workload entry.
	if proxy.Metadata.Labels != nil {
		entry.Labels = mergeLabels(entry.Labels, proxy.Metadata.Labels)
		// the label has been converted to "istio-locality: region/zone/subzone"
		// in pilot/pkg/xds/ads.go, and `/` is not allowed in k8s label value.
		// Instead of converting again, we delete it since has set WorkloadEntry.Locality
		delete(entry.Labels, model.LocalityLabel)
	}

		},
	}
}

func fakeNode(r, z, sz string) *core.Node {
	return &core.Node{
		Locality: &core.Locality{
			Region:  r,
			Zone:    z,
			SubZone: sz,
		},
	}
}

// createOrFail wraps config creation with convenience for failing tests
func createOrFail(t test.Failer, store model.ConfigStoreController, cfg config.Config) {