service_test.go

/*
Copyright 2017 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package source

import (
	"context"
	"net"
	"sort"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"github.com/stretchr/testify/suite"
	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/client-go/kubernetes/fake"

	"sigs.k8s.io/external-dns/endpoint"
)

type ServiceSuite struct {
	suite.Suite
	sc             Source
	fooWithTargets *v1.Service
}

func (suite *ServiceSuite) SetupTest() {
	fakeClient := fake.NewSimpleClientset()

	suite.fooWithTargets = &v1.Service{
		Spec: v1.ServiceSpec{
			Type: v1.ServiceTypeLoadBalancer,
		},
		ObjectMeta: metav1.ObjectMeta{
			Namespace:   "default",
			Name:        "foo-with-targets",
			Annotations: map[string]string{},
		},
		Status: v1.ServiceStatus{
			LoadBalancer: v1.LoadBalancerStatus{
				Ingress: []v1.LoadBalancerIngress{
					{IP: "8.8.8.8"},
					{Hostname: "foo"},
				},
			},
		},
	}
	_, err := fakeClient.CoreV1().Services(suite.fooWithTargets.Namespace).Create(context.Background(), suite.fooWithTargets, metav1.CreateOptions{})
	suite.NoError(err, "should successfully create service")

	suite.sc, err = NewServiceSource(
		context.TODO(),
		fakeClient,
		"",
		"",
		"{{.Name}}",
		false,
		"",
		false,
		false,
		false,
		[]string{},
		false,
		labels.Everything(),
		false,
	)
	suite.NoError(err, "should initialize service source")
}

func (suite *ServiceSuite) TestResourceLabelIsSet() {
	endpoints, _ := suite.sc.Endpoints(context.Background())
	for _, ep := range endpoints {
		suite.Equal("service/default/foo-with-targets", ep.Labels[endpoint.ResourceLabelKey], "should set correct resource label")
	}
}

func TestServiceSource(t *testing.T) {
	t.Parallel()

	suite.Run(t, new(ServiceSuite))
	t.Run("Interface", testServiceSourceImplementsSource)
	t.Run("NewServiceSource", testServiceSourceNewServiceSource)
	t.Run("Endpoints", testServiceSourceEndpoints)
	t.Run("MultipleServices", testMultipleServicesEndpoints)
}

// testServiceSourceImplementsSource tests that serviceSource is a valid Source.
func testServiceSourceImplementsSource(t *testing.T) {
	assert.Implements(t, (*Source)(nil), new(serviceSource))
}

// testServiceSourceNewServiceSource tests that NewServiceSource doesn't return an error.
func testServiceSourceNewServiceSource(t *testing.T) {
	t.Parallel()

	for _, ti := range []struct {
		title              string
		annotationFilter   string
		fqdnTemplate       string
		serviceTypesFilter []string
		expectError        bool
	}{
		{
			title:        "invalid template",
			expectError:  true,
			fqdnTemplate: "{{.Name",
		},
		{
			title:       "valid empty template",
			expectError: false,
		},
		{
			title:        "valid template",
			expectError:  false,
			fqdnTemplate: "{{.Name}}-{{.Namespace}}.ext-dns.test.com",
		},
		{
			title:            "non-empty annotation filter label",
			expectError:      false,
			annotationFilter: "kubernetes.io/ingress.class=nginx",
		},
		{
			title:              "non-empty service types filter",
			expectError:        false,
			serviceTypesFilter: []string{string(v1.ServiceTypeClusterIP)},
		},
	} {
		ti := ti
		t.Run(ti.title, func(t *testing.T) {
			t.Parallel()

			_, err := NewServiceSource(
				context.TODO(),
				fake.NewSimpleClientset(),
				"",
				ti.annotationFilter,
				ti.fqdnTemplate,
				false,
				"",
				false,
				false,
				false,
				ti.serviceTypesFilter,
				false,
				labels.Everything(),
				false,
			)

			if ti.expectError {
				assert.Error(t, err)
			} else {
				assert.NoError(t, err)
			}
		})
	}
}

// testServiceSourceEndpoints tests that various services generate the correct endpoints.
func testServiceSourceEndpoints(t *testing.T) {
	t.Parallel()

	for _, tc := range []struct {
		title                       string
		targetNamespace             string
		annotationFilter            string
		svcNamespace                string
		svcName                     string
		svcType                     v1.ServiceType
		compatibility               string
		fqdnTemplate                string
		combineFQDNAndAnnotation    bool
		ignoreHostnameAnnotation    bool
		labels                      map[string]string
		annotations                 map[string]string
		clusterIP                   string
		externalIPs                 []string
		lbs                         []string
		serviceTypesFilter          []string
		expected                    []*endpoint.Endpoint
		expectError                 bool
		serviceLabelSelector        string
		resolveLoadBalancerHostname bool
	}{
		{
			title:              "no annotated services return no endpoints",
			svcNamespace:       "testing",
			svcName:            "foo",
			svcType:            v1.ServiceTypeLoadBalancer,
			labels:             map[string]string{},
			annotations:        map[string]string{},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected:           []*endpoint.Endpoint{},
		},
		{
			title:                    "no annotated services return no endpoints when ignoring annotations",
			svcNamespace:             "testing",
			svcName:                  "foo",
			svcType:                  v1.ServiceTypeLoadBalancer,
			ignoreHostnameAnnotation: true,
			labels:                   map[string]string{},
			annotations:              map[string]string{},
			externalIPs:              []string{},
			lbs:                      []string{"1.2.3.4"},
			serviceTypesFilter:       []string{},
			expected:                 []*endpoint.Endpoint{},
		},
		{
			title:        "annotated services return an endpoint with target IP",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:                    "hostname annotation on services is ignored",
			svcNamespace:             "testing",
			svcName:                  "foo",
			svcType:                  v1.ServiceTypeLoadBalancer,
			ignoreHostnameAnnotation: true,
			labels:                   map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected:           []*endpoint.Endpoint{},
		},
		{
			title:        "annotated ClusterIp aren't processed without explicit authorization",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			clusterIP:          "1.2.3.4",
			externalIPs:        []string{},
			lbs:                []string{},
			serviceTypesFilter: []string{},
			expected:           []*endpoint.Endpoint{},
		},
		{
			title:              "FQDN template with multiple hostnames return an endpoint with target IP",
			svcNamespace:       "testing",
			svcName:            "foo",
			svcType:            v1.ServiceTypeLoadBalancer,
			fqdnTemplate:       "{{.Name}}.fqdn.org,{{.Name}}.fqdn.com",
			labels:             map[string]string{},
			annotations:        map[string]string{},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.fqdn.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "foo.fqdn.com", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:                    "FQDN template with multiple hostnames return an endpoint with target IP when ignoring annotations",
			svcNamespace:             "testing",
			svcName:                  "foo",
			svcType:                  v1.ServiceTypeLoadBalancer,
			fqdnTemplate:             "{{.Name}}.fqdn.org,{{.Name}}.fqdn.com",
			ignoreHostnameAnnotation: true,
			labels:                   map[string]string{},
			annotations:              map[string]string{},
			externalIPs:              []string{},
			lbs:                      []string{"1.2.3.4"},
			serviceTypesFilter:       []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.fqdn.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "foo.fqdn.com", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:                    "FQDN template and annotation both with multiple hostnames return an endpoint with target IP",
			svcNamespace:             "testing",
			svcName:                  "foo",
			svcType:                  v1.ServiceTypeLoadBalancer,
			fqdnTemplate:             "{{.Name}}.fqdn.org,{{.Name}}.fqdn.com",
			combineFQDNAndAnnotation: true,
			labels:                   map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org., bar.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "bar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "foo.fqdn.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "foo.fqdn.com", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:                    "FQDN template and annotation both with multiple hostnames while ignoring annotations will only return FQDN endpoints",
			svcNamespace:             "testing",
			svcName:                  "foo",
			svcType:                  v1.ServiceTypeLoadBalancer,
			fqdnTemplate:             "{{.Name}}.fqdn.org,{{.Name}}.fqdn.com",
			combineFQDNAndAnnotation: true,
			ignoreHostnameAnnotation: true,
			labels:                   map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org., bar.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.fqdn.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "foo.fqdn.com", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:        "annotated services with multiple hostnames return an endpoint with target IP",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org., bar.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "bar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:        "annotated services with multiple hostnames and without trailing period return an endpoint with target IP",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org, bar.example.org",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "bar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:        "annotated services return an endpoint with target hostname",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"lb.example.com"}, // Kubernetes omits the trailing dot
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"lb.example.com"}},
			},
		},
		{
			title:        "annotated services return an endpoint with hostname then resolve hostname",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:                 []string{},
			lbs:                         []string{"example.com"}, // Use a resolvable hostname for testing.
			serviceTypesFilter:          []string{},
			resolveLoadBalancerHostname: true,
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"93.184.216.34"}},
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2606:2800:220:1:248:1893:25c8:1946"}},
			},
		},
		{
			title:        "annotated services can omit trailing dot",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org", // Trailing dot is omitted
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4", "lb.example.com"}, // Kubernetes omits the trailing dot
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"lb.example.com"}},
			},
		},
		{
			title:        "our controller type is kops dns controller",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				controllerAnnotationKey: controllerAnnotationValue,
				hostnameAnnotationKey:   "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:        "different controller types are ignored even (with template specified)",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			fqdnTemplate: "{{.Name}}.ext-dns.test.com",
			labels:       map[string]string{},
			annotations: map[string]string{
				controllerAnnotationKey: "some-other-tool",
				hostnameAnnotationKey:   "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected:           []*endpoint.Endpoint{},
		},
		{
			title:           "services are found in target namespace",
			targetNamespace: "testing",
			svcNamespace:    "testing",
			svcName:         "foo",
			svcType:         v1.ServiceTypeLoadBalancer,
			labels:          map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:           "services that are not in target namespace are ignored",
			targetNamespace: "testing",
			svcNamespace:    "other-testing",
			svcName:         "foo",
			svcType:         v1.ServiceTypeLoadBalancer,
			labels:          map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected:           []*endpoint.Endpoint{},
		},
		{
			title:        "services are found in all namespaces",
			svcNamespace: "other-testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:            "valid matching annotation filter expression",
			annotationFilter: "service.beta.kubernetes.io/external-traffic in (Global, OnlyLocal)",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeLoadBalancer,
			labels:           map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey:                         "foo.example.org.",
				"service.beta.kubernetes.io/external-traffic": "OnlyLocal",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:            "valid non-matching annotation filter expression",
			annotationFilter: "service.beta.kubernetes.io/external-traffic in (Global, OnlyLocal)",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeLoadBalancer,
			labels:           map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey:                         "foo.example.org.",
				"service.beta.kubernetes.io/external-traffic": "SomethingElse",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected:           []*endpoint.Endpoint{},
		},
		{
			title:            "invalid annotation filter expression",
			annotationFilter: "service.beta.kubernetes.io/external-traffic in (Global OnlyLocal)",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeLoadBalancer,
			labels:           map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey:                         "foo.example.org.",
				"service.beta.kubernetes.io/external-traffic": "OnlyLocal",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected:           []*endpoint.Endpoint{},
			expectError:        true,
		},
		{
			title:            "valid matching annotation filter label",
			annotationFilter: "service.beta.kubernetes.io/external-traffic=Global",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeLoadBalancer,
			labels:           map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey:                         "foo.example.org.",
				"service.beta.kubernetes.io/external-traffic": "Global",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:            "valid non-matching annotation filter label",
			annotationFilter: "service.beta.kubernetes.io/external-traffic=Global",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeLoadBalancer,
			labels:           map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey:                         "foo.example.org.",
				"service.beta.kubernetes.io/external-traffic": "OnlyLocal",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected:           []*endpoint.Endpoint{},
		},
		{
			title:        "no external entrypoints return no endpoints",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{},
			serviceTypesFilter: []string{},
			expected:           []*endpoint.Endpoint{},
		},
		{
			title:        "annotated service with externalIPs returns a single endpoint with multiple targets",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{"10.2.3.4", "11.2.3.4"},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.2.3.4", "11.2.3.4"}},
			},
		},
		{
			title:        "multiple external entrypoints return a single endpoint with multiple targets",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4", "8.8.8.8"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4", "8.8.8.8"}},
			},
		},
		{
			title:        "services annotated with legacy mate annotations are ignored in default mode",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				"zalando.org/dnsname": "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected:           []*endpoint.Endpoint{},
		},
		{
			title:         "services annotated with legacy mate annotations return an endpoint in compatibility mode",
			svcNamespace:  "testing",
			svcName:       "foo",
			svcType:       v1.ServiceTypeLoadBalancer,
			compatibility: "mate",
			labels:        map[string]string{},
			annotations: map[string]string{
				"zalando.org/dnsname": "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:         "services annotated with legacy molecule annotations return an endpoint in compatibility mode",
			svcNamespace:  "testing",
			svcName:       "foo",
			svcType:       v1.ServiceTypeLoadBalancer,
			compatibility: "molecule",
			labels: map[string]string{
				"dns": "route53",
			},
			annotations: map[string]string{
				"domainName": "foo.example.org., bar.example.org",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "bar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:         "load balancer services annotated with DNS Controller annotations return an endpoint with A and CNAME targets in compatibility mode",
			svcNamespace:  "testing",
			svcName:       "foo",
			svcType:       v1.ServiceTypeLoadBalancer,
			compatibility: "kops-dns-controller",
			labels:        map[string]string{},
			annotations: map[string]string{
				kopsDNSControllerInternalHostnameAnnotationKey: "internal.foo.example.org",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4", "lb.example.com"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "internal.foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "internal.foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"lb.example.com"}},
			},
		},
		{
			title:         "load balancer services annotated with DNS Controller annotations return an endpoint with both annotations in compatibility mode",
			svcNamespace:  "testing",
			svcName:       "foo",
			svcType:       v1.ServiceTypeLoadBalancer,
			compatibility: "kops-dns-controller",
			labels:        map[string]string{},
			annotations: map[string]string{
				kopsDNSControllerInternalHostnameAnnotationKey: "internal.foo.example.org., internal.bar.example.org",
				kopsDNSControllerHostnameAnnotationKey:         "foo.example.org., bar.example.org",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "bar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "internal.foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "internal.bar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:              "not annotated services with set fqdnTemplate return an endpoint with target IP",
			svcNamespace:       "testing",
			svcName:            "foo",
			svcType:            v1.ServiceTypeLoadBalancer,
			fqdnTemplate:       "{{.Name}}.bar.example.com",
			labels:             map[string]string{},
			annotations:        map[string]string{},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4", "elb.com"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.bar.example.com", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "foo.bar.example.com", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"elb.com"}},
			},
		},
		{
			title:        "annotated services with set fqdnTemplate annotation takes precedence",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			fqdnTemplate: "{{.Name}}.bar.example.com",
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4", "elb.com"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"elb.com"}},
			},
		},
		{
			title:         "compatibility annotated services with tmpl. compatibility takes precedence",
			svcNamespace:  "testing",
			svcName:       "foo",
			svcType:       v1.ServiceTypeLoadBalancer,
			compatibility: "mate",
			fqdnTemplate:  "{{.Name}}.bar.example.com",
			labels:        map[string]string{},
			annotations: map[string]string{
				"zalando.org/dnsname": "mate.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "mate.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:              "not annotated services with unknown tmpl field should not return anything",
			svcNamespace:       "testing",
			svcName:            "foo",
			svcType:            v1.ServiceTypeLoadBalancer,
			fqdnTemplate:       "{{.Calibre}}.bar.example.com",
			labels:             map[string]string{},
			annotations:        map[string]string{},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected:           []*endpoint.Endpoint{},
			expectError:        true,
		},
		{
			title:        "ttl not annotated should have RecordTTL.IsConfigured set to false",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}, RecordTTL: endpoint.TTL(0)},
			},
		},
		{
			title:        "ttl annotated but invalid should have RecordTTL.IsConfigured set to false",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				ttlAnnotationKey:      "foo",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}, RecordTTL: endpoint.TTL(0)},
			},
		},
		{
			title:        "ttl annotated and is valid should set Record.TTL",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				ttlAnnotationKey:      "10",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}, RecordTTL: endpoint.TTL(10)},
			},
		},
		{
			title:        "ttl annotated (in duration format) and is valid should set Record.TTL",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				ttlAnnotationKey:      "1m",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}, RecordTTL: endpoint.TTL(60)},
			},
		},
		{
			title:        "Negative ttl is not valid",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				ttlAnnotationKey:      "-10",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}, RecordTTL: endpoint.TTL(0)},
			},
		},
		{
			title:        "filter on service types should include matching services",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{string(v1.ServiceTypeLoadBalancer)},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:        "filter on service types should exclude non-matching services",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeNodePort,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{string(v1.ServiceTypeLoadBalancer)},
			expected:           []*endpoint.Endpoint{},
		},
		{
			title:        "internal-host annotated services return an endpoint with Cluster IP",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				internalHostnameAnnotationKey: "foo.internal.example.org.",
			},
			clusterIP:          "1.1.1.1",
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.internal.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}},
			},
		},
		{
			title:        "internal-host annotated and host annotated services return an endpoint with Cluster IP and an endpoint with lb IP",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels:       map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey:         "foo.example.org.",
				internalHostnameAnnotationKey: "foo.internal.example.org.",
			},
			clusterIP:          "1.1.1.1",
			externalIPs:        []string{},
			lbs:                []string{"1.2.3.4"},
			serviceTypesFilter: []string{},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.internal.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}},
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:        "service with matching labels and fqdn filter should be included",
			svcNamespace: "testing",
			svcName:      "fqdn",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels: map[string]string{
				"app": "web-external",
			},
			clusterIP:            "1.1.1.1",
			externalIPs:          []string{},
			lbs:                  []string{"1.2.3.4"},
			serviceTypesFilter:   []string{},
			serviceLabelSelector: "app=web-external",
			fqdnTemplate:         "{{.Name}}.bar.example.com",
			expected: []*endpoint.Endpoint{
				{DNSName: "fqdn.bar.example.com", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:        "service with matching labels and hostname annotation should be included",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels: map[string]string{
				"app": "web-external",
			},
			clusterIP:            "1.1.1.1",
			externalIPs:          []string{},
			lbs:                  []string{"1.2.3.4"},
			serviceTypesFilter:   []string{},
			serviceLabelSelector: "app=web-external",
			annotations:          map[string]string{hostnameAnnotationKey: "annotation.bar.example.com"},
			expected: []*endpoint.Endpoint{
				{DNSName: "annotation.bar.example.com", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:        "service without matching labels and fqdn filter should be excluded",
			svcNamespace: "testing",
			svcName:      "fqdn",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels: map[string]string{
				"app": "web-internal",
			},
			clusterIP:            "1.1.1.1",
			externalIPs:          []string{},
			lbs:                  []string{"1.2.3.4"},
			serviceTypesFilter:   []string{},
			serviceLabelSelector: "app=web-external",
			fqdnTemplate:         "{{.Name}}.bar.example.com",
			expected:             []*endpoint.Endpoint{},
		},
		{
			title:        "service without matching labels and hostname annotation should be excluded",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeLoadBalancer,
			labels: map[string]string{
				"app": "web-internal",
			},
			clusterIP:            "1.1.1.1",
			externalIPs:          []string{},
			lbs:                  []string{"1.2.3.4"},
			serviceTypesFilter:   []string{},
			serviceLabelSelector: "app=web-external",
			annotations:          map[string]string{hostnameAnnotationKey: "annotation.bar.example.com"},
			expected:             []*endpoint.Endpoint{},
		},
		{
			title:              "dual-stack load-balancer service gets both addresses",
			svcNamespace:       "testing",
			svcName:            "foobar",
			svcType:            v1.ServiceTypeLoadBalancer,
			labels:             map[string]string{},
			clusterIP:          "1.1.1.2,2001:db8::2",
			externalIPs:        []string{},
			lbs:                []string{"1.1.1.1", "2001:db8::1"},
			serviceTypesFilter: []string{},
			annotations:        map[string]string{hostnameAnnotationKey: "foobar.example.org"},
			expected: []*endpoint.Endpoint{
				{DNSName: "foobar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}},
				{DNSName: "foobar.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::1"}},
			},
		},
		{
			title:              "IPv6-only load-balancer service gets IPv6 endpoint",
			svcNamespace:       "testing",
			svcName:            "foobar-v6",
			svcType:            v1.ServiceTypeLoadBalancer,
			labels:             map[string]string{},
			clusterIP:          "2001:db8::1",
			externalIPs:        []string{},
			lbs:                []string{"2001:db8::2"},
			serviceTypesFilter: []string{},
			annotations:        map[string]string{hostnameAnnotationKey: "foobar-v6.example.org"},
			expected: []*endpoint.Endpoint{
				{DNSName: "foobar-v6.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::2"}},
			},
		},
	} {
		tc := tc
		t.Run(tc.title, func(t *testing.T) {
			t.Parallel()

			// Create a Kubernetes testing client
			kubernetes := fake.NewSimpleClientset()

			// Create a service to test against
			ingresses := []v1.LoadBalancerIngress{}
			for _, lb := range tc.lbs {
				if net.ParseIP(lb) != nil {
					ingresses = append(ingresses, v1.LoadBalancerIngress{IP: lb})
				} else {
					ingresses = append(ingresses, v1.LoadBalancerIngress{Hostname: lb})
				}
			}

			service := &v1.Service{
				Spec: v1.ServiceSpec{
					Type:        tc.svcType,
					ClusterIP:   tc.clusterIP,
					ExternalIPs: tc.externalIPs,
				},
				ObjectMeta: metav1.ObjectMeta{
					Namespace:   tc.svcNamespace,
					Name:        tc.svcName,
					Labels:      tc.labels,
					Annotations: tc.annotations,
				},
				Status: v1.ServiceStatus{
					LoadBalancer: v1.LoadBalancerStatus{
						Ingress: ingresses,
					},
				},
			}

			_, err := kubernetes.CoreV1().Services(service.Namespace).Create(context.Background(), service, metav1.CreateOptions{})
			require.NoError(t, err)

			var sourceLabel labels.Selector
			if tc.serviceLabelSelector != "" {
				sourceLabel, err = labels.Parse(tc.serviceLabelSelector)
				require.NoError(t, err)
			} else {
				sourceLabel = labels.Everything()
			}

			// Create our object under test and get the endpoints.
			client, err := NewServiceSource(
				context.TODO(),
				kubernetes,
				tc.targetNamespace,
				tc.annotationFilter,
				tc.fqdnTemplate,
				tc.combineFQDNAndAnnotation,
				tc.compatibility,
				false,
				false,
				false,
				tc.serviceTypesFilter,
				tc.ignoreHostnameAnnotation,
				sourceLabel,
				tc.resolveLoadBalancerHostname,
			)

			require.NoError(t, err)

			res, err := client.Endpoints(context.Background())
			if tc.expectError {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
			}

			// Validate returned endpoints against desired endpoints.
			validateEndpoints(t, res, tc.expected)
		})
	}
}

// testMultipleServicesEndpoints tests that multiple services generate correct merged endpoints
func testMultipleServicesEndpoints(t *testing.T) {
	t.Parallel()

	for _, tc := range []struct {
		title                    string
		targetNamespace          string
		annotationFilter         string
		svcNamespace             string
		svcName                  string
		svcType                  v1.ServiceType
		compatibility            string
		fqdnTemplate             string
		combineFQDNAndAnnotation bool
		ignoreHostnameAnnotation bool
		labels                   map[string]string
		clusterIP                string
		services                 map[string]map[string]string
		serviceTypesFilter       []string
		expected                 []*endpoint.Endpoint
		expectError              bool
	}{
		{
			"test service returns a correct end point",
			"",
			"",
			"testing",
			"foo",
			v1.ServiceTypeLoadBalancer,
			"",
			"",
			false,
			false,
			map[string]string{},
			"",
			map[string]map[string]string{
				"1.2.3.4": {hostnameAnnotationKey: "foo.example.org"},
			},
			[]string{},
			[]*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/foo1.2.3.4"}},
			},
			false,
		},
		{
			"multiple services that share same DNS should be merged into one endpoint",
			"",
			"",
			"testing",
			"foo",
			v1.ServiceTypeLoadBalancer,
			"",
			"",
			false,
			false,
			map[string]string{},
			"",
			map[string]map[string]string{
				"1.2.3.4": {hostnameAnnotationKey: "foo.example.org"},
				"1.2.3.5": {hostnameAnnotationKey: "foo.example.org"},
				"1.2.3.6": {hostnameAnnotationKey: "foo.example.org"},
			},
			[]string{},
			[]*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4", "1.2.3.5", "1.2.3.6"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/foo1.2.3.4"}},
			},
			false,
		},
		{
			"test that services with different hostnames do not get merged together",
			"",
			"",
			"testing",
			"foo",
			v1.ServiceTypeLoadBalancer,
			"",
			"",
			false,
			false,
			map[string]string{},
			"",
			map[string]map[string]string{
				"1.2.3.5":  {hostnameAnnotationKey: "foo.example.org"},
				"10.1.1.3": {hostnameAnnotationKey: "bar.example.org"},
				"10.1.1.1": {hostnameAnnotationKey: "bar.example.org"},
				"1.2.3.4":  {hostnameAnnotationKey: "foo.example.org"},
				"10.1.1.2": {hostnameAnnotationKey: "bar.example.org"},
				"20.1.1.1": {hostnameAnnotationKey: "foobar.example.org"},
				"1.2.3.6":  {hostnameAnnotationKey: "foo.example.org"},
			},
			[]string{},
			[]*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4", "1.2.3.5", "1.2.3.6"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/foo1.2.3.4"}},
				{DNSName: "bar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.1.1.1", "10.1.1.2", "10.1.1.3"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/foo10.1.1.1"}},
				{DNSName: "foobar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"20.1.1.1"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/foo20.1.1.1"}},
			},
			false,
		},
		{
			"test that services with different set-identifier do not get merged together",
			"",
			"",
			"testing",
			"foo",
			v1.ServiceTypeLoadBalancer,
			"",
			"",
			false,
			false,
			map[string]string{},
			"",
			map[string]map[string]string{
				"a.elb.com": {hostnameAnnotationKey: "foo.example.org", SetIdentifierKey: "a"},
				"b.elb.com": {hostnameAnnotationKey: "foo.example.org", SetIdentifierKey: "b"},
			},
			[]string{},
			[]*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"a.elb.com"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/fooa.elb.com"}, SetIdentifier: "a"},
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"b.elb.com"}, Labels: map[string]string{endpoint.ResourceLabelKey: "service/testing/foob.elb.com"}, SetIdentifier: "b"},
			},
			false,
		},
	} {
		tc := tc
		t.Run(tc.title, func(t *testing.T) {
			t.Parallel()

			// Create a Kubernetes testing client
			kubernetes := fake.NewSimpleClientset()

			// Create services to test against
			for lb, annotations := range tc.services {
				ingresses := []v1.LoadBalancerIngress{}
				ingresses = append(ingresses, v1.LoadBalancerIngress{IP: lb})

				service := &v1.Service{
					Spec: v1.ServiceSpec{
						Type:      tc.svcType,
						ClusterIP: tc.clusterIP,
					},
					ObjectMeta: metav1.ObjectMeta{
						Namespace:   tc.svcNamespace,
						Name:        tc.svcName + lb,
						Labels:      tc.labels,
						Annotations: annotations,
					},
					Status: v1.ServiceStatus{
						LoadBalancer: v1.LoadBalancerStatus{
							Ingress: ingresses,
						},
					},
				}

				_, err := kubernetes.CoreV1().Services(service.Namespace).Create(context.Background(), service, metav1.CreateOptions{})
				require.NoError(t, err)
			}

			// Create our object under test and get the endpoints.
			client, err := NewServiceSource(
				context.TODO(),
				kubernetes,
				tc.targetNamespace,
				tc.annotationFilter,
				tc.fqdnTemplate,
				tc.combineFQDNAndAnnotation,
				tc.compatibility,
				false,
				false,
				false,
				tc.serviceTypesFilter,
				tc.ignoreHostnameAnnotation,
				labels.Everything(),
				false,
			)
			require.NoError(t, err)

			res, err := client.Endpoints(context.Background())
			if tc.expectError {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
			}

			// Validate returned endpoints against desired endpoints.
			validateEndpoints(t, res, tc.expected)
			// Test that endpoint resourceLabelKey matches desired endpoint
			sort.SliceStable(res, func(i, j int) bool {
				return strings.Compare(res[i].DNSName, res[j].DNSName) < 0
			})
			sort.SliceStable(tc.expected, func(i, j int) bool {
				return strings.Compare(tc.expected[i].DNSName, tc.expected[j].DNSName) < 0
			})

			for i := range res {
				if res[i].Labels[endpoint.ResourceLabelKey] != tc.expected[i].Labels[endpoint.ResourceLabelKey] {
					t.Errorf("expected %s, got %s", tc.expected[i].Labels[endpoint.ResourceLabelKey], res[i].Labels[endpoint.ResourceLabelKey])
				}
			}
		})
	}
}

// testServiceSourceEndpoints tests that various services generate the correct endpoints.
func TestClusterIpServices(t *testing.T) {
	t.Parallel()

	for _, tc := range []struct {
		title                    string
		targetNamespace          string
		annotationFilter         string
		svcNamespace             string
		svcName                  string
		svcType                  v1.ServiceType
		compatibility            string
		fqdnTemplate             string
		ignoreHostnameAnnotation bool
		labels                   map[string]string
		annotations              map[string]string
		clusterIP                string
		expected                 []*endpoint.Endpoint
		expectError              bool
		labelSelector            string
	}{
		{
			title:        "hostname annotated ClusterIp services return an endpoint with Cluster IP",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			clusterIP: "1.2.3.4",
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
		},
		{
			title:        "target annotated ClusterIp services return an endpoint with the specified A",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				targetAnnotationKey:   "4.3.2.1",
			},
			clusterIP: "1.2.3.4",
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"4.3.2.1"}},
			},
		},
		{
			title:        "target annotated ClusterIp services return an endpoint with the specified CNAME",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				targetAnnotationKey:   "bar.example.org.",
			},
			clusterIP: "1.2.3.4",
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"bar.example.org"}},
			},
		},
		{
			title:        "target annotated ClusterIp services return an endpoint with the specified AAAA",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				targetAnnotationKey:   "2001:DB8::1",
			},
			clusterIP: "1.2.3.4",
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:DB8::1"}},
			},
		},
		{
			title:        "multiple target annotated ClusterIp services return an endpoint with the specified CNAMES",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				targetAnnotationKey:   "bar.example.org.,baz.example.org.",
			},
			clusterIP: "1.2.3.4",
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"bar.example.org", "baz.example.org"}},
			},
		},
		{
			title:        "multiple target annotated ClusterIp services return two endpoints with the specified CNAMES and AAAA",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				targetAnnotationKey:   "bar.example.org.,baz.example.org.,2001:DB8::1",
			},
			clusterIP: "1.2.3.4",
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"bar.example.org", "baz.example.org"}},
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:DB8::1"}},
			},
		},
		{
			title:                    "hostname annotated ClusterIp services are ignored",
			svcNamespace:             "testing",
			svcName:                  "foo",
			svcType:                  v1.ServiceTypeClusterIP,
			ignoreHostnameAnnotation: true,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			clusterIP: "1.2.3.4",
			expected:  []*endpoint.Endpoint{},
		},
		{
			title:                    "hostname and target annotated ClusterIp services are ignored",
			svcNamespace:             "testing",
			svcName:                  "foo",
			svcType:                  v1.ServiceTypeClusterIP,
			ignoreHostnameAnnotation: true,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				targetAnnotationKey:   "bar.example.org.",
			},
			clusterIP: "1.2.3.4",
			expected:  []*endpoint.Endpoint{},
		},
		{
			title:        "hostname and target annotated ClusterIp services return an endpoint with the specified CNAME",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				targetAnnotationKey:   "bar.example.org.",
			},
			clusterIP: "1.2.3.4",
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"bar.example.org"}},
			},
		},
		{
			title:        "non-annotated ClusterIp services with set fqdnTemplate return an endpoint with target IP",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			fqdnTemplate: "{{.Name}}.bar.example.com",
			clusterIP:    "4.5.6.7",
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.bar.example.com", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"4.5.6.7"}},
			},
		},
		{
			title:        "Headless services do not generate endpoints",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			clusterIP:    v1.ClusterIPNone,
			expected:     []*endpoint.Endpoint{},
		},
		{
			title:        "Headless services generate endpoints when target is specified",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				targetAnnotationKey:   "bar.example.org.",
			},
			clusterIP: v1.ClusterIPNone,
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"bar.example.org"}},
			},
		},
		{
			title:        "ClusterIP service with matching label generates an endpoint",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			fqdnTemplate: "{{.Name}}.bar.example.com",
			labels:       map[string]string{"app": "web-internal"},
			clusterIP:    "4.5.6.7",
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.bar.example.com", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"4.5.6.7"}},
			},
			labelSelector: "app=web-internal",
		},
		{
			title:        "ClusterIP service with matching label and target generates a CNAME endpoint",
			svcNamespace: "testing",
			svcName:      "foo",
			svcType:      v1.ServiceTypeClusterIP,
			fqdnTemplate: "{{.Name}}.bar.example.com",
			labels:       map[string]string{"app": "web-internal"},
			annotations:  map[string]string{targetAnnotationKey: "bar.example.com."},
			clusterIP:    "4.5.6.7",
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.bar.example.com", RecordType: endpoint.RecordTypeCNAME, Targets: endpoint.Targets{"bar.example.com"}},
			},
			labelSelector: "app=web-internal",
		},
		{
			title:         "ClusterIP service without matching label generates an endpoint",
			svcNamespace:  "testing",
			svcName:       "foo",
			svcType:       v1.ServiceTypeClusterIP,
			fqdnTemplate:  "{{.Name}}.bar.example.com",
			labels:        map[string]string{"app": "web-internal"},
			clusterIP:     "4.5.6.7",
			expected:      []*endpoint.Endpoint{},
			labelSelector: "app=web-external",
		},
	} {
		tc := tc
		t.Run(tc.title, func(t *testing.T) {
			t.Parallel()

			// Create a Kubernetes testing client
			kubernetes := fake.NewSimpleClientset()

			// Create a service to test against
			service := &v1.Service{
				Spec: v1.ServiceSpec{
					Type:      tc.svcType,
					ClusterIP: tc.clusterIP,
				},
				ObjectMeta: metav1.ObjectMeta{
					Namespace:   tc.svcNamespace,
					Name:        tc.svcName,
					Labels:      tc.labels,
					Annotations: tc.annotations,
				},
			}

			_, err := kubernetes.CoreV1().Services(service.Namespace).Create(context.Background(), service, metav1.CreateOptions{})
			require.NoError(t, err)

			var labelSelector labels.Selector
			if tc.labelSelector != "" {
				labelSelector, err = labels.Parse(tc.labelSelector)
				require.NoError(t, err)
			} else {
				labelSelector = labels.Everything()
			}
			// Create our object under test and get the endpoints.
			client, _ := NewServiceSource(
				context.TODO(),
				kubernetes,
				tc.targetNamespace,
				tc.annotationFilter,
				tc.fqdnTemplate,
				false,
				tc.compatibility,
				true,
				false,
				false,
				[]string{},
				tc.ignoreHostnameAnnotation,
				labelSelector,
				false,
			)
			require.NoError(t, err)

			endpoints, err := client.Endpoints(context.Background())
			if tc.expectError {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
			}

			// Validate returned endpoints against desired endpoints.
			validateEndpoints(t, endpoints, tc.expected)
		})
	}
}

// testNodePortServices tests that various services generate the correct endpoints.
func TestServiceSourceNodePortServices(t *testing.T) {
	t.Parallel()

	for _, tc := range []struct {
		title                    string
		targetNamespace          string
		annotationFilter         string
		svcNamespace             string
		svcName                  string
		svcType                  v1.ServiceType
		svcTrafficPolicy         v1.ServiceExternalTrafficPolicyType
		compatibility            string
		fqdnTemplate             string
		ignoreHostnameAnnotation bool
		labels                   map[string]string
		annotations              map[string]string
		lbs                      []string
		expected                 []*endpoint.Endpoint
		expectError              bool
		nodes                    []*v1.Node
		podNames                 []string
		nodeIndex                []int
		phases                   []v1.PodPhase
		labelSelector            labels.Selector
	}{
		{
			title:            "annotated NodePort services return an endpoint with IP addresses of the cluster's nodes",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeNodePort,
			svcTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeCluster,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			expected: []*endpoint.Endpoint{
				{DNSName: "_foo._tcp.foo.example.org", Targets: endpoint.Targets{"0 50 30192 foo.example.org"}, RecordType: endpoint.RecordTypeSRV},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"54.10.11.1", "54.10.11.2"}, RecordType: endpoint.RecordTypeA},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"2001:DB8::1", "2001:DB8::2"}, RecordType: endpoint.RecordTypeAAAA},
			},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.1"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.2"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
		},
		{
			title:                    "hostname annotated NodePort services are ignored",
			svcNamespace:             "testing",
			svcName:                  "foo",
			svcType:                  v1.ServiceTypeNodePort,
			svcTrafficPolicy:         v1.ServiceExternalTrafficPolicyTypeCluster,
			ignoreHostnameAnnotation: true,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.1"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.2"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
			expected: []*endpoint.Endpoint{},
		},
		{
			title:            "non-annotated NodePort services with set fqdnTemplate return an endpoint with target IP",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeNodePort,
			svcTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeCluster,
			fqdnTemplate:     "{{.Name}}.bar.example.com",
			expected: []*endpoint.Endpoint{
				{DNSName: "_foo._tcp.foo.bar.example.com", Targets: endpoint.Targets{"0 50 30192 foo.bar.example.com"}, RecordType: endpoint.RecordTypeSRV},
				{DNSName: "foo.bar.example.com", Targets: endpoint.Targets{"54.10.11.1", "54.10.11.2"}, RecordType: endpoint.RecordTypeA},
				{DNSName: "foo.bar.example.com", Targets: endpoint.Targets{"2001:DB8::1", "2001:DB8::2"}, RecordType: endpoint.RecordTypeAAAA},
			},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.1"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.2"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
		},
		{
			title:            "annotated NodePort services return an endpoint with IP addresses of the private cluster's nodes",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeNodePort,
			svcTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeCluster,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			expected: []*endpoint.Endpoint{
				{DNSName: "_foo._tcp.foo.example.org", Targets: endpoint.Targets{"0 50 30192 foo.example.org"}, RecordType: endpoint.RecordTypeSRV},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"10.0.1.1", "10.0.1.2"}, RecordType: endpoint.RecordTypeA},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"2001:DB8::1", "2001:DB8::2"}, RecordType: endpoint.RecordTypeAAAA},
			},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
		},
		{
			title:            "annotated NodePort services with ExternalTrafficPolicy=Local return an endpoint with IP addresses of the cluster's nodes where pods is running only",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeNodePort,
			svcTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeLocal,
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			expected: []*endpoint.Endpoint{
				{DNSName: "_foo._tcp.foo.example.org", Targets: endpoint.Targets{"0 50 30192 foo.example.org"}, RecordType: endpoint.RecordTypeSRV},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"54.10.11.2"}, RecordType: endpoint.RecordTypeA},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"2001:DB8::2"}, RecordType: endpoint.RecordTypeAAAA},
			},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.1"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.2"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
			podNames:  []string{"pod-0"},
			nodeIndex: []int{1},
			phases:    []v1.PodPhase{v1.PodRunning},
		},
		{
			title:            "annotated NodePort services with ExternalTrafficPolicy=Local and multiple pods on a single node return an endpoint with unique IP addresses of the cluster's nodes where pods is running only",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeNodePort,
			svcTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeLocal,
			labels:           map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
			expected: []*endpoint.Endpoint{
				{DNSName: "_foo._tcp.foo.example.org", Targets: endpoint.Targets{"0 50 30192 foo.example.org"}, RecordType: endpoint.RecordTypeSRV},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"54.10.11.2"}, RecordType: endpoint.RecordTypeA},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"2001:DB8::2"}, RecordType: endpoint.RecordTypeAAAA},
			},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.1"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.2"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
			podNames:  []string{"pod-0", "pod-1"},
			nodeIndex: []int{1, 1},
			phases:    []v1.PodPhase{v1.PodRunning, v1.PodRunning},
		},
		{
			title:            "access=private annotation NodePort services return an endpoint with private IP addresses of the cluster's nodes",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeNodePort,
			svcTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeCluster,
			labels:           map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				accessAnnotationKey:   "private",
			},
			expected: []*endpoint.Endpoint{
				{DNSName: "_foo._tcp.foo.example.org", Targets: endpoint.Targets{"0 50 30192 foo.example.org"}, RecordType: endpoint.RecordTypeSRV},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"10.0.1.1", "10.0.1.2"}, RecordType: endpoint.RecordTypeA},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"2001:DB8::1", "2001:DB8::2"}, RecordType: endpoint.RecordTypeAAAA},
			},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.1"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.2"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
		},
		{
			title:            "access=public annotation NodePort services return an endpoint with public IP addresses of the cluster's nodes",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeNodePort,
			svcTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeCluster,
			labels:           map[string]string{},
			annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
				accessAnnotationKey:   "public",
			},
			expected: []*endpoint.Endpoint{
				{DNSName: "_foo._tcp.foo.example.org", Targets: endpoint.Targets{"0 50 30192 foo.example.org"}, RecordType: endpoint.RecordTypeSRV},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"54.10.11.1", "54.10.11.2"}, RecordType: endpoint.RecordTypeA},
				{DNSName: "foo.example.org", Targets: endpoint.Targets{"2001:DB8::1", "2001:DB8::2"}, RecordType: endpoint.RecordTypeAAAA},
			},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.1"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.2"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
		},
		{
			title:            "node port services annotated DNS Controller annotations return an endpoint where all targets has the node role",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeNodePort,
			svcTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeCluster,
			compatibility:    "kops-dns-controller",
			labels:           map[string]string{},
			annotations: map[string]string{
				kopsDNSControllerInternalHostnameAnnotationKey: "internal.foo.example.org., internal.bar.example.org",
			},
			expected: []*endpoint.Endpoint{
				{DNSName: "internal.foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.0.1.1"}},
				{DNSName: "internal.foo.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:DB8::1"}},
				{DNSName: "internal.bar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.0.1.1"}},
				{DNSName: "internal.bar.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:DB8::1"}},
			},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
					Labels: map[string]string{
						"node-role.kubernetes.io/node": "",
					},
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.1"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
					Labels: map[string]string{
						"node-role.kubernetes.io/control-plane": "",
					},
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.2"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
		},
		{
			title:            "node port services annotated with internal DNS Controller annotations return an endpoint in compatibility mode",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeNodePort,
			svcTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeCluster,
			compatibility:    "kops-dns-controller",
			annotations: map[string]string{
				kopsDNSControllerInternalHostnameAnnotationKey: "internal.foo.example.org., internal.bar.example.org",
			},
			expected: []*endpoint.Endpoint{
				{DNSName: "internal.foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.0.1.1", "10.0.1.2"}},
				{DNSName: "internal.foo.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:DB8::1", "2001:DB8::2"}},
				{DNSName: "internal.bar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"10.0.1.1", "10.0.1.2"}},
				{DNSName: "internal.bar.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:DB8::1", "2001:DB8::2"}},
			},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
					Labels: map[string]string{
						"node-role.kubernetes.io/node": "",
					},
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.1"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
					Labels: map[string]string{
						"node-role.kubernetes.io/node": "",
					},
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.2"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
		},
		{
			title:            "node port services annotated with external DNS Controller annotations return an endpoint in compatibility mode",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeNodePort,
			svcTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeCluster,
			compatibility:    "kops-dns-controller",
			annotations: map[string]string{
				kopsDNSControllerHostnameAnnotationKey: "foo.example.org., bar.example.org",
			},
			expected: []*endpoint.Endpoint{
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"54.10.11.1", "54.10.11.2"}},
				{DNSName: "foo.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:DB8::1", "2001:DB8::2"}},
				{DNSName: "bar.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"54.10.11.1", "54.10.11.2"}},
				{DNSName: "bar.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:DB8::1", "2001:DB8::2"}},
			},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
					Labels: map[string]string{
						"node-role.kubernetes.io/node": "",
					},
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.1"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
					Labels: map[string]string{
						"node-role.kubernetes.io/node": "",
					},
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.2"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
		},
		{
			title:            "node port services annotated with both kops dns controller annotations return an empty set of addons",
			svcNamespace:     "testing",
			svcName:          "foo",
			svcType:          v1.ServiceTypeNodePort,
			svcTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeCluster,
			compatibility:    "kops-dns-controller",
			labels:           map[string]string{},
			annotations: map[string]string{
				kopsDNSControllerInternalHostnameAnnotationKey: "internal.foo.example.org., internal.bar.example.org",
				kopsDNSControllerHostnameAnnotationKey:         "foo.example.org., bar.example.org",
			},
			expected: []*endpoint.Endpoint{},
			nodes: []*v1.Node{{
				ObjectMeta: metav1.ObjectMeta{
					Name: "node1",
					Labels: map[string]string{
						"node-role.kubernetes.io/node": "",
					},
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.1"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.1"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::1"},
					},
				},
			}, {
				ObjectMeta: metav1.ObjectMeta{
					Name: "node2",
					Labels: map[string]string{
						"node-role.kubernetes.io/node": "",
					},
				},
				Status: v1.NodeStatus{
					Addresses: []v1.NodeAddress{
						{Type: v1.NodeExternalIP, Address: "54.10.11.2"},
						{Type: v1.NodeInternalIP, Address: "10.0.1.2"},
						{Type: v1.NodeInternalIP, Address: "2001:DB8::2"},
					},
				},
			}},
		},
	} {
		tc := tc
		t.Run(tc.title, func(t *testing.T) {
			t.Parallel()

			// Create a Kubernetes testing client
			kubernetes := fake.NewSimpleClientset()

			// Create the nodes
			for _, node := range tc.nodes {
				if _, err := kubernetes.CoreV1().Nodes().Create(context.Background(), node, metav1.CreateOptions{}); err != nil {
					t.Fatal(err)
				}
			}

			// Create  pods
			for i, podname := range tc.podNames {
				pod := &v1.Pod{
					Spec: v1.PodSpec{
						Containers: []v1.Container{},
						Hostname:   podname,
						NodeName:   tc.nodes[tc.nodeIndex[i]].Name,
					},
					ObjectMeta: metav1.ObjectMeta{
						Namespace:   tc.svcNamespace,
						Name:        podname,
						Labels:      tc.labels,
						Annotations: tc.annotations,
					},
					Status: v1.PodStatus{
						Phase: tc.phases[i],
					},
				}

				_, err := kubernetes.CoreV1().Pods(tc.svcNamespace).Create(context.Background(), pod, metav1.CreateOptions{})
				require.NoError(t, err)
			}

			// Create a service to test against
			service := &v1.Service{
				Spec: v1.ServiceSpec{
					Type:                  tc.svcType,
					ExternalTrafficPolicy: tc.svcTrafficPolicy,
					Ports: []v1.ServicePort{
						{
							NodePort: 30192,
						},
					},
				},
				ObjectMeta: metav1.ObjectMeta{
					Namespace:   tc.svcNamespace,
					Name:        tc.svcName,
					Labels:      tc.labels,
					Annotations: tc.annotations,
				},
			}

			_, err := kubernetes.CoreV1().Services(service.Namespace).Create(context.Background(), service, metav1.CreateOptions{})
			require.NoError(t, err)

			// Create our object under test and get the endpoints.
			client, _ := NewServiceSource(
				context.TODO(),
				kubernetes,
				tc.targetNamespace,
				tc.annotationFilter,
				tc.fqdnTemplate,
				false,
				tc.compatibility,
				true,
				false,
				false,
				[]string{},
				tc.ignoreHostnameAnnotation,
				labels.Everything(),
				false,
			)
			require.NoError(t, err)

			endpoints, err := client.Endpoints(context.Background())
			if tc.expectError {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
			}

			// Validate returned endpoints against desired endpoints.
			validateEndpoints(t, endpoints, tc.expected)
		})
	}
}

// TestHeadlessServices tests that headless services generate the correct endpoints.
func TestHeadlessServices(t *testing.T) {
	t.Parallel()

	for _, tc := range []struct {
		title                    string
		targetNamespace          string
		svcNamespace             string
		svcName                  string
		svcType                  v1.ServiceType
		compatibility            string
		fqdnTemplate             string
		ignoreHostnameAnnotation bool
		labels                   map[string]string
		svcAnnotations           map[string]string
		podAnnotations           map[string]string
		clusterIP                string
		podIPs                   []string
		hostIPs                  []string
		selector                 map[string]string
		lbs                      []string
		podnames                 []string
		hostnames                []string
		podsReady                []bool
		publishNotReadyAddresses bool
		nodes                    []v1.Node
		expected                 []*endpoint.Endpoint
		expectError              bool
	}{
		{
			"annotated Headless services return IPv4 endpoints for each selected Pod",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			[]string{"", ""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}},
				{DNSName: "foo-1.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.2"}},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1", "1.1.1.2"}},
			},
			false,
		},
		{
			"annotated Headless services return IPv6 endpoints for each selected Pod",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"2001:db8::1", "2001:db8::2"},
			[]string{"", ""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::1"}},
				{DNSName: "foo-1.service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::2"}},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::1", "2001:db8::2"}},
			},
			false,
		},
		{
			"hostname annotated Headless services are ignored",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			true,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			[]string{"", ""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{},
			false,
		},
		{
			"annotated Headless services return IPv4 endpoints with TTL for each selected Pod",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
				ttlAnnotationKey:      "1",
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			[]string{"", ""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}, RecordTTL: endpoint.TTL(1)},
				{DNSName: "foo-1.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.2"}, RecordTTL: endpoint.TTL(1)},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1", "1.1.1.2"}, RecordTTL: endpoint.TTL(1)},
			},
			false,
		},
		{
			"annotated Headless services return IPv6 endpoints with TTL for each selected Pod",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
				ttlAnnotationKey:      "1",
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"2001:db8::1", "2001:db8::2"},
			[]string{"", ""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::1"}, RecordTTL: endpoint.TTL(1)},
				{DNSName: "foo-1.service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::2"}, RecordTTL: endpoint.TTL(1)},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::1", "2001:db8::2"}, RecordTTL: endpoint.TTL(1)},
			},
			false,
		},
		{
			"annotated Headless services return endpoints for each selected Pod, which are in running state",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			[]string{"", ""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, false},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}},
			},
			false,
		},
		{
			"annotated Headless services return endpoints for all Pod if publishNotReadyAddresses is set",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			[]string{"", ""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, false},
			true,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}},
				{DNSName: "foo-1.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.2"}},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1", "1.1.1.2"}},
			},
			false,
		},
		{
			"annotated Headless services return endpoints for pods missing hostname",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			[]string{"", ""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"", ""},
			[]bool{true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1", "1.1.1.2"}},
			},
			false,
		},
		{
			"annotated Headless services return only a unique set of IPv4 targets",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.1", "1.1.1.2"},
			[]string{"", "", ""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1", "foo-3"},
			[]string{"", "", ""},
			[]bool{true, true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1", "1.1.1.2"}},
			},
			false,
		},
		{
			"annotated Headless services return only a unique set of IPv6 targets",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"2001:db8::1", "2001:db8::1", "2001:db8::2"},
			[]string{"", "", ""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1", "foo-3"},
			[]string{"", "", ""},
			[]bool{true, true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::1", "2001:db8::2"}},
			},
			false,
		},
		{
			"annotated Headless services return IPv4 targets from pod annotation",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			map[string]string{
				targetAnnotationKey: "1.2.3.4",
			},
			v1.ClusterIPNone,
			[]string{"1.1.1.1"},
			[]string{""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo"},
			[]string{"", "", ""},
			[]bool{true, true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
			false,
		},
		{
			"annotated Headless services return IPv6 targets from pod annotation",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			map[string]string{
				targetAnnotationKey: "2001:db8::4",
			},
			v1.ClusterIPNone,
			[]string{"2001:db8::1"},
			[]string{""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo"},
			[]string{"", "", ""},
			[]bool{true, true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::4"}},
			},
			false,
		},
		{
			"annotated Headless services return IPv4 targets from node external IP if endpoints-type annotation is set",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey:      "service.example.org",
				endpointsTypeAnnotationKey: EndpointsTypeNodeExternalIP,
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"1.1.1.1"},
			[]string{""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo"},
			[]string{"", "", ""},
			[]bool{true, true, true},
			false,
			[]v1.Node{
				{
					Status: v1.NodeStatus{
						Addresses: []v1.NodeAddress{
							{
								Type:    v1.NodeExternalIP,
								Address: "1.2.3.4",
							},
						},
					},
				},
			},
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
			false,
		},
		{
			"annotated Headless services return IPv6 targets from node external IP if endpoints-type annotation is set",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey:      "service.example.org",
				endpointsTypeAnnotationKey: EndpointsTypeNodeExternalIP,
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"2001:db8::1"},
			[]string{""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo"},
			[]string{"", "", ""},
			[]bool{true, true, true},
			false,
			[]v1.Node{
				{
					Status: v1.NodeStatus{
						Addresses: []v1.NodeAddress{
							{
								Type:    v1.NodeInternalIP,
								Address: "2001:db8::4",
							},
						},
					},
				},
			},
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::4"}},
			},
			false,
		},
		{
			"annotated Headless services return dual-stack targets from node external IP if endpoints-type annotation is set",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey:      "service.example.org",
				endpointsTypeAnnotationKey: EndpointsTypeNodeExternalIP,
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"1.1.1.1"},
			[]string{""},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo"},
			[]string{"", "", ""},
			[]bool{true, true, true},
			false,
			[]v1.Node{
				{
					Status: v1.NodeStatus{
						Addresses: []v1.NodeAddress{
							{
								Type:    v1.NodeExternalIP,
								Address: "1.2.3.4",
							},
							{
								Type:    v1.NodeInternalIP,
								Address: "2001:db8::4",
							},
						},
					},
				},
			},
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::4"}},
			},
			false,
		},
		{
			"annotated Headless services return IPv4 targets from hostIP if endpoints-type annotation is set",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey:      "service.example.org",
				endpointsTypeAnnotationKey: EndpointsTypeHostIP,
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"1.1.1.1"},
			[]string{"1.2.3.4"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo"},
			[]string{"", "", ""},
			[]bool{true, true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.2.3.4"}},
			},
			false,
		},
		{
			"annotated Headless services return IPv6 targets from hostIP if endpoints-type annotation is set",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey:      "service.example.org",
				endpointsTypeAnnotationKey: EndpointsTypeHostIP,
			},
			map[string]string{},
			v1.ClusterIPNone,
			[]string{"2001:db8::1"},
			[]string{"2001:db8::4"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo"},
			[]string{"", "", ""},
			[]bool{true, true, true},
			false,
			[]v1.Node{},
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::4"}},
			},
			false,
		},
	} {
		tc := tc
		t.Run(tc.title, func(t *testing.T) {
			t.Parallel()

			// Create a Kubernetes testing client
			kubernetes := fake.NewSimpleClientset()

			service := &v1.Service{
				Spec: v1.ServiceSpec{
					Type:                     tc.svcType,
					ClusterIP:                tc.clusterIP,
					Selector:                 tc.selector,
					PublishNotReadyAddresses: tc.publishNotReadyAddresses,
				},
				ObjectMeta: metav1.ObjectMeta{
					Namespace:   tc.svcNamespace,
					Name:        tc.svcName,
					Labels:      tc.labels,
					Annotations: tc.svcAnnotations,
				},
				Status: v1.ServiceStatus{},
			}
			_, err := kubernetes.CoreV1().Services(service.Namespace).Create(context.Background(), service, metav1.CreateOptions{})
			require.NoError(t, err)

			var addresses, notReadyAddresses []v1.EndpointAddress
			for i, podname := range tc.podnames {
				pod := &v1.Pod{
					Spec: v1.PodSpec{
						Containers: []v1.Container{},
						Hostname:   tc.hostnames[i],
					},
					ObjectMeta: metav1.ObjectMeta{
						Namespace:   tc.svcNamespace,
						Name:        podname,
						Labels:      tc.labels,
						Annotations: tc.podAnnotations,
					},
					Status: v1.PodStatus{
						PodIP:  tc.podIPs[i],
						HostIP: tc.hostIPs[i],
					},
				}

				_, err = kubernetes.CoreV1().Pods(tc.svcNamespace).Create(context.Background(), pod, metav1.CreateOptions{})
				require.NoError(t, err)

				address := v1.EndpointAddress{
					IP: tc.podIPs[i],
					TargetRef: &v1.ObjectReference{
						APIVersion: "",
						Kind:       "Pod",
						Name:       podname,
					},
				}
				if tc.podsReady[i] {
					addresses = append(addresses, address)
				} else {
					notReadyAddresses = append(notReadyAddresses, address)
				}
			}
			endpointsObject := &v1.Endpoints{
				ObjectMeta: metav1.ObjectMeta{
					Namespace: tc.svcNamespace,
					Name:      tc.svcName,
					Labels:    tc.labels,
				},
				Subsets: []v1.EndpointSubset{
					{
						Addresses:         addresses,
						NotReadyAddresses: notReadyAddresses,
					},
				},
			}
			_, err = kubernetes.CoreV1().Endpoints(tc.svcNamespace).Create(context.Background(), endpointsObject, metav1.CreateOptions{})
			require.NoError(t, err)
			for _, node := range tc.nodes {
				_, err = kubernetes.CoreV1().Nodes().Create(context.Background(), &node, metav1.CreateOptions{})
				require.NoError(t, err)
			}

			// Create our object under test and get the endpoints.
			client, _ := NewServiceSource(
				context.TODO(),
				kubernetes,
				tc.targetNamespace,
				"",
				tc.fqdnTemplate,
				false,
				tc.compatibility,
				true,
				false,
				false,
				[]string{},
				tc.ignoreHostnameAnnotation,
				labels.Everything(),
				false,
			)
			require.NoError(t, err)

			endpoints, err := client.Endpoints(context.Background())
			if tc.expectError {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
			}

			// Validate returned endpoints against desired endpoints.
			validateEndpoints(t, endpoints, tc.expected)
		})
	}
}

// TestHeadlessServices tests that headless services generate the correct endpoints.
func TestHeadlessServicesHostIP(t *testing.T) {
	t.Parallel()

	for _, tc := range []struct {
		title                    string
		targetNamespace          string
		svcNamespace             string
		svcName                  string
		svcType                  v1.ServiceType
		compatibility            string
		fqdnTemplate             string
		ignoreHostnameAnnotation bool
		labels                   map[string]string
		annotations              map[string]string
		clusterIP                string
		hostIPs                  []string
		selector                 map[string]string
		lbs                      []string
		podnames                 []string
		hostnames                []string
		podsReady                []bool
		targetRefs               []*v1.ObjectReference
		publishNotReadyAddresses bool
		expected                 []*endpoint.Endpoint
		expectError              bool
	}{
		{
			"annotated Headless services return IPv4 endpoints for each selected Pod",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, true},
			[]*v1.ObjectReference{
				{APIVersion: "", Kind: "Pod", Name: "foo-0"},
				{APIVersion: "", Kind: "Pod", Name: "foo-1"},
			},
			false,
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}},
				{DNSName: "foo-1.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.2"}},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1", "1.1.1.2"}},
			},
			false,
		},
		{
			"annotated Headless services return IPv6 endpoints for each selected Pod",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			v1.ClusterIPNone,
			[]string{"2001:db8::1", "2001:db8::2"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, true},
			[]*v1.ObjectReference{
				{APIVersion: "", Kind: "Pod", Name: "foo-0"},
				{APIVersion: "", Kind: "Pod", Name: "foo-1"},
			},
			false,
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::1"}},
				{DNSName: "foo-1.service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::2"}},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::1", "2001:db8::2"}},
			},
			false,
		},
		{
			"hostname annotated Headless services are ignored",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			true,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, true},
			[]*v1.ObjectReference{
				{APIVersion: "", Kind: "Pod", Name: "foo-0"},
				{APIVersion: "", Kind: "Pod", Name: "foo-1"},
			},
			false,
			[]*endpoint.Endpoint{},
			false,
		},
		{
			"annotated Headless services return IPv4 endpoints with TTL for each selected Pod",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
				ttlAnnotationKey:      "1",
			},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, true},
			[]*v1.ObjectReference{
				{APIVersion: "", Kind: "Pod", Name: "foo-0"},
				{APIVersion: "", Kind: "Pod", Name: "foo-1"},
			},
			false,
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}, RecordTTL: endpoint.TTL(1)},
				{DNSName: "foo-1.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.2"}, RecordTTL: endpoint.TTL(1)},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1", "1.1.1.2"}, RecordTTL: endpoint.TTL(1)},
			},
			false,
		},
		{
			"annotated Headless services return IPv6 endpoints with TTL for each selected Pod",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
				ttlAnnotationKey:      "1",
			},
			v1.ClusterIPNone,
			[]string{"2001:db8::1", "2001:db8::2"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, true},
			[]*v1.ObjectReference{
				{APIVersion: "", Kind: "Pod", Name: "foo-0"},
				{APIVersion: "", Kind: "Pod", Name: "foo-1"},
			},
			false,
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::1"}, RecordTTL: endpoint.TTL(1)},
				{DNSName: "foo-1.service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::2"}, RecordTTL: endpoint.TTL(1)},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::1", "2001:db8::2"}, RecordTTL: endpoint.TTL(1)},
			},
			false,
		},
		{
			"annotated Headless services return endpoints for each selected Pod, which are in running state",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, false},
			[]*v1.ObjectReference{
				{APIVersion: "", Kind: "Pod", Name: "foo-0"},
				{APIVersion: "", Kind: "Pod", Name: "foo-1"},
			},
			false,
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}},
			},
			false,
		},
		{
			"annotated Headless services return endpoints for all Pod if publishNotReadyAddresses is set",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"foo-0", "foo-1"},
			[]bool{true, false},
			[]*v1.ObjectReference{
				{APIVersion: "", Kind: "Pod", Name: "foo-0"},
				{APIVersion: "", Kind: "Pod", Name: "foo-1"},
			},
			true,
			[]*endpoint.Endpoint{
				{DNSName: "foo-0.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1"}},
				{DNSName: "foo-1.service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.2"}},
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1", "1.1.1.2"}},
			},
			false,
		},
		{
			"annotated Headless services return IPv4 endpoints for pods missing hostname",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			v1.ClusterIPNone,
			[]string{"1.1.1.1", "1.1.1.2"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"", ""},
			[]bool{true, true},
			[]*v1.ObjectReference{
				{APIVersion: "", Kind: "Pod", Name: "foo-0"},
				{APIVersion: "", Kind: "Pod", Name: "foo-1"},
			},
			false,
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeA, Targets: endpoint.Targets{"1.1.1.1", "1.1.1.2"}},
			},
			false,
		},
		{
			"annotated Headless services return IPv6 endpoints for pods missing hostname",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			v1.ClusterIPNone,
			[]string{"2001:db8::1", "2001:db8::2"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0", "foo-1"},
			[]string{"", ""},
			[]bool{true, true},
			[]*v1.ObjectReference{
				{APIVersion: "", Kind: "Pod", Name: "foo-0"},
				{APIVersion: "", Kind: "Pod", Name: "foo-1"},
			},
			false,
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", RecordType: endpoint.RecordTypeAAAA, Targets: endpoint.Targets{"2001:db8::1", "2001:db8::2"}},
			},
			false,
		},
		{
			"annotated Headless services without a targetRef has no endpoints",
			"",
			"testing",
			"foo",
			v1.ServiceTypeClusterIP,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			v1.ClusterIPNone,
			[]string{"1.1.1.1"},
			map[string]string{
				"component": "foo",
			},
			[]string{},
			[]string{"foo-0"},
			[]string{"foo-0"},
			[]bool{true, true},
			[]*v1.ObjectReference{nil},
			false,
			[]*endpoint.Endpoint{},
			false,
		},
	} {
		tc := tc
		t.Run(tc.title, func(t *testing.T) {
			t.Parallel()

			// Create a Kubernetes testing client
			kubernetes := fake.NewSimpleClientset()

			service := &v1.Service{
				Spec: v1.ServiceSpec{
					Type:                     tc.svcType,
					ClusterIP:                tc.clusterIP,
					Selector:                 tc.selector,
					PublishNotReadyAddresses: tc.publishNotReadyAddresses,
				},
				ObjectMeta: metav1.ObjectMeta{
					Namespace:   tc.svcNamespace,
					Name:        tc.svcName,
					Labels:      tc.labels,
					Annotations: tc.annotations,
				},
				Status: v1.ServiceStatus{},
			}
			_, err := kubernetes.CoreV1().Services(service.Namespace).Create(context.Background(), service, metav1.CreateOptions{})
			require.NoError(t, err)

			var addresses []v1.EndpointAddress
			var notReadyAddresses []v1.EndpointAddress
			for i, podname := range tc.podnames {
				pod := &v1.Pod{
					Spec: v1.PodSpec{
						Containers: []v1.Container{},
						Hostname:   tc.hostnames[i],
					},
					ObjectMeta: metav1.ObjectMeta{
						Namespace:   tc.svcNamespace,
						Name:        podname,
						Labels:      tc.labels,
						Annotations: tc.annotations,
					},
					Status: v1.PodStatus{
						HostIP: tc.hostIPs[i],
					},
				}

				_, err = kubernetes.CoreV1().Pods(tc.svcNamespace).Create(context.Background(), pod, metav1.CreateOptions{})
				require.NoError(t, err)

				address := v1.EndpointAddress{
					IP:        "4.3.2.1",
					TargetRef: tc.targetRefs[i],
				}
				if tc.podsReady[i] {
					addresses = append(addresses, address)
				} else {
					notReadyAddresses = append(notReadyAddresses, address)
				}
			}
			endpointsObject := &v1.Endpoints{
				ObjectMeta: metav1.ObjectMeta{
					Namespace: tc.svcNamespace,
					Name:      tc.svcName,
					Labels:    tc.labels,
				},
				Subsets: []v1.EndpointSubset{
					{
						Addresses:         addresses,
						NotReadyAddresses: notReadyAddresses,
					},
				},
			}
			_, err = kubernetes.CoreV1().Endpoints(tc.svcNamespace).Create(context.Background(), endpointsObject, metav1.CreateOptions{})
			require.NoError(t, err)

			// Create our object under test and get the endpoints.
			client, _ := NewServiceSource(
				context.TODO(),
				kubernetes,
				tc.targetNamespace,
				"",
				tc.fqdnTemplate,
				false,
				tc.compatibility,
				true,
				true,
				false,
				[]string{},
				tc.ignoreHostnameAnnotation,
				labels.Everything(),
				false,
			)
			require.NoError(t, err)

			endpoints, err := client.Endpoints(context.Background())
			if tc.expectError {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
			}

			// Validate returned endpoints against desired endpoints.
			validateEndpoints(t, endpoints, tc.expected)
		})
	}
}

// TestExternalServices tests that external services generate the correct endpoints.
func TestExternalServices(t *testing.T) {
	t.Parallel()

	for _, tc := range []struct {
		title                    string
		targetNamespace          string
		svcNamespace             string
		svcName                  string
		svcType                  v1.ServiceType
		compatibility            string
		fqdnTemplate             string
		ignoreHostnameAnnotation bool
		labels                   map[string]string
		annotations              map[string]string
		externalName             string
		expected                 []*endpoint.Endpoint
		expectError              bool
	}{
		{
			"external services return an A endpoint for the external name that is an IPv4 address",
			"",
			"testing",
			"foo",
			v1.ServiceTypeExternalName,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			"111.111.111.111",
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", Targets: endpoint.Targets{"111.111.111.111"}, RecordType: endpoint.RecordTypeA},
			},
			false,
		},
		{
			"external services return an AAAA endpoint for the external name that is an IPv6 address",
			"",
			"testing",
			"foo",
			v1.ServiceTypeExternalName,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			"2001:db8::111",
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", Targets: endpoint.Targets{"2001:db8::111"}, RecordType: endpoint.RecordTypeAAAA},
			},
			false,
		},
		{
			"external services return a CNAME endpoint for the external name that is a domain",
			"",
			"testing",
			"foo",
			v1.ServiceTypeExternalName,
			"",
			"",
			false,
			map[string]string{"component": "foo"},
			map[string]string{
				hostnameAnnotationKey: "service.example.org",
			},
			"remote.example.com",
			[]*endpoint.Endpoint{
				{DNSName: "service.example.org", Targets: endpoint.Targets{"remote.example.com"}, RecordType: endpoint.RecordTypeCNAME},
			},
			false,
		},
	} {
		tc := tc
		t.Run(tc.title, func(t *testing.T) {
			t.Parallel()

			// Create a Kubernetes testing client
			kubernetes := fake.NewSimpleClientset()

			service := &v1.Service{
				Spec: v1.ServiceSpec{
					Type:         tc.svcType,
					ExternalName: tc.externalName,
				},
				ObjectMeta: metav1.ObjectMeta{
					Namespace:   tc.svcNamespace,
					Name:        tc.svcName,
					Labels:      tc.labels,
					Annotations: tc.annotations,
				},
				Status: v1.ServiceStatus{},
			}
			_, err := kubernetes.CoreV1().Services(service.Namespace).Create(context.Background(), service, metav1.CreateOptions{})
			require.NoError(t, err)

			// Create our object under test and get the endpoints.
			client, _ := NewServiceSource(
				context.TODO(),
				kubernetes,
				tc.targetNamespace,
				"",
				tc.fqdnTemplate,
				false,
				tc.compatibility,
				true,
				false,
				false,
				[]string{},
				tc.ignoreHostnameAnnotation,
				labels.Everything(),
				false,
			)
			require.NoError(t, err)

			endpoints, err := client.Endpoints(context.Background())
			if tc.expectError {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
			}

			// Validate returned endpoints against desired endpoints.
			validateEndpoints(t, endpoints, tc.expected)
		})
	}
}

func BenchmarkServiceEndpoints(b *testing.B) {
	kubernetes := fake.NewSimpleClientset()

	service := &v1.Service{
		ObjectMeta: metav1.ObjectMeta{
			Namespace: "testing",
			Name:      "foo",
			Annotations: map[string]string{
				hostnameAnnotationKey: "foo.example.org.",
			},
		},
		Status: v1.ServiceStatus{
			LoadBalancer: v1.LoadBalancerStatus{
				Ingress: []v1.LoadBalancerIngress{
					{IP: "1.2.3.4"},
					{IP: "8.8.8.8"},
				},
			},
		},
	}

	_, err := kubernetes.CoreV1().Services(service.Namespace).Create(context.Background(), service, metav1.CreateOptions{})
	require.NoError(b, err)

	client, err := NewServiceSource(
		context.TODO(),
		kubernetes,
		v1.NamespaceAll,
		"",
		"",
		false,
		"",
		false,
		false,
		false,
		[]string{},
		false,
		labels.Everything(),
		false,
	)
	require.NoError(b, err)

	for i := 0; i < b.N; i++ {
		_, err := client.Endpoints(context.Background())
		require.NoError(b, err)
	}
}