endpointSlices     []*discovery.EndpointSlice
		expectedNumActions int
		expectedNumSlices  int
	}{{
		testName: "Endpoints with no addresses",
		service:  &v1.Service{},
		endpoints: &v1.Endpoints{
			Subsets: []v1.EndpointSubset{{
				Ports: []v1.EndpointPort{{Port: 80}},
			}},
		},
		endpointSlices:     []*discovery.EndpointSlice{},
		expectedNumActions: 0,
		expectedNumSlices:  0,
	}, {

    SortedSet<String> set = of("e");
    assertTrue(set.subSet("c", "g") instanceof ImmutableSortedSet);
    assertThat(set.subSet("c", "g")).contains("e");
    assertThat(set.subSet("e", "g")).contains("e");
    assertSame(this.<String>of(), set.subSet("f", "g"));
    assertSame(this.<String>of(), set.subSet("c", "e"));
    assertSame(this.<String>of(), set.subSet("c", "d"));
  }

  public void testSingle_first() {

metadata:
  name: valid-virtual-service
spec:
  hosts:
    - c
  http:
    - route:
      - destination:
          host: c
          subset: v1
        weight: 75
      - destination:
          host: c
          subset: v2
        weight: 25`
	validVirtualServiceJSON = `{
"apiVersion": "networking.istio.io/v1alpha3",
"kind": "VirtualService",
"metadata": {

									StringValue: "test-subset",
								},
							},
						},
					},
				},
			},
		},
		{
			"no metadata",
			&core.Metadata{},
			"test-subset",
			&core.Metadata{},
		},
	}

	for _, v := range cases {
		t.Run(v.name, func(tt *testing.T) {
			AddSubsetToMetadata(v.in, v.subset)
			got := v.in
			if diff := cmp.Diff(got, v.want, protocmp.Transform()); diff != "" {

// with apply.
type EndpointsApplyConfiguration struct {
	v1.TypeMetaApplyConfiguration    `json:",inline"`
	*v1.ObjectMetaApplyConfiguration `json:"metadata,omitempty"`
	Subsets                          []EndpointSubsetApplyConfiguration `json:"subsets,omitempty"`
}

// Endpoints constructs an declarative configuration of the Endpoints type for use with
// apply.
func Endpoints(name, namespace string) *EndpointsApplyConfiguration {

			ServiceAccount: true,
			Subsets: []echo.SubsetConfig{
				{
					Replicas: 1,
					Version:  "v1",
				},
				{
					Replicas: 1,
					Version:  "v2",
				},
			},
		}).
		WithConfig(echo.Config{
			Service:        Uncaptured,
			Namespace:      apps.Namespace,
			Ports:          ports.All(),
			ServiceAccount: true,
			Subsets: []echo.SubsetConfig{
				{
					Replicas: 1,

func (b *builder) validateTemplates(config echo.Config, c cluster.Cluster) bool {
	expected := sets.New[string]()
	for _, subset := range config.Subsets {
		expected.InsertAll(parseList(subset.Annotations[annotation.InjectTemplates.Name])...)
	}
	if b.templates == nil || b.templates[c.Name()] == nil {
		return expected.IsEmpty()
	}

				ServiceRegistry: provider.Kubernetes,
				Name:            "reviews",
				Namespace:       "default",
			},
			"reviews.default.svc.cluster.local_grpc-svc_7443",
		},
		{
			"Service FQDN With Empty Subset, Port and Port Name pattern",
			"%SERVICE_FQDN%%SUBSET_NAME%_%SERVICE_PORT_NAME%_%SERVICE_PORT%",
			"reviews.default.svc.cluster.local",
			"",
			0,
			&model.Port{Name: "grpc-svc", Port: 7443, Protocol: "GRPC"},

	}

	// If V is itself an interface, each of its possible types must be in the set
	// of T types (i.e., the V type set must be a subset of the T type set).
	// Interfaces V with empty type sets were already excluded above.
	if Vi != nil {
		if !Vi.typeSet().subsetOf(Ti.typeSet()) {
			// TODO(gri) report which type is missing
			if cause != nil {
				*cause = check.sprintf("%s does not %s %s", V, verb, T)
			}

	hostname := host.Name("hostname")
	cases := []struct {
		hostname host.Name
		subset   string
		port     int
		want     string
	}{
		{
			hostname: "hostname",
			subset:   "subset",
			port:     80,
			want:     "outbound|80|subset|hostname",
		},
		{
			hostname: "hostname",
			subset:   "",
			port:     80,
			want:     "outbound|80||hostname",
		},
	}