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| 1 | +/* |
| 2 | +Copyright 2025 The Kubernetes Authors. |
| 3 | +Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +you may not use this file except in compliance with the License. |
| 5 | +You may obtain a copy of the License at |
| 6 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 7 | +Unless required by applicable law or agreed to in writing, software |
| 8 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 9 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 10 | +See the License for the specific language governing permissions and |
| 11 | +limitations under the License. |
| 12 | +*/ |
| 13 | + |
| 14 | +package informers |
| 15 | + |
| 16 | +import ( |
| 17 | + "testing" |
| 18 | + |
| 19 | + "github.com/stretchr/testify/assert" |
| 20 | + "github.com/stretchr/testify/require" |
| 21 | + corev1 "k8s.io/api/core/v1" |
| 22 | + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 23 | + kubeinformers "k8s.io/client-go/informers" |
| 24 | + "k8s.io/client-go/kubernetes/fake" |
| 25 | +) |
| 26 | + |
| 27 | +func TestTransformerWithOptions_Service(t *testing.T) { |
| 28 | + base := fakeService() |
| 29 | + |
| 30 | + tests := []struct { |
| 31 | + name string |
| 32 | + options []func(*TransformOptions) |
| 33 | + asserts func(any) |
| 34 | + }{ |
| 35 | + { |
| 36 | + name: "minimalistic object", |
| 37 | + options: nil, |
| 38 | + asserts: func(obj any) { |
| 39 | + svc, ok := obj.(*corev1.Service) |
| 40 | + assert.True(t, ok) |
| 41 | + assert.Empty(t, svc.UID) |
| 42 | + assert.NotEmpty(t, svc.Name) |
| 43 | + assert.NotEmpty(t, svc.Namespace) |
| 44 | + }, |
| 45 | + }, |
| 46 | + { |
| 47 | + name: "with selector", |
| 48 | + options: []func(*TransformOptions){TransformWithSpecSelector()}, |
| 49 | + asserts: func(obj any) { |
| 50 | + svc, ok := obj.(*corev1.Service) |
| 51 | + assert.True(t, ok) |
| 52 | + assert.NotEmpty(t, svc.Spec.Selector) |
| 53 | + assert.Empty(t, svc.Spec.ExternalIPs) |
| 54 | + assert.Empty(t, svc.Status.LoadBalancer.Ingress) |
| 55 | + }, |
| 56 | + }, |
| 57 | + { |
| 58 | + name: "with selector", |
| 59 | + options: []func(*TransformOptions){TransformWithSpecSelector()}, |
| 60 | + asserts: func(obj any) { |
| 61 | + svc, ok := obj.(*corev1.Service) |
| 62 | + assert.True(t, ok) |
| 63 | + assert.NotEmpty(t, svc.Spec.Selector) |
| 64 | + assert.Empty(t, svc.Spec.ExternalIPs) |
| 65 | + assert.Empty(t, svc.Status.LoadBalancer.Ingress) |
| 66 | + }, |
| 67 | + }, |
| 68 | + { |
| 69 | + name: "with loadBalancer", |
| 70 | + options: []func(*TransformOptions){TransformWithStatusLoadBalancer()}, |
| 71 | + asserts: func(obj any) { |
| 72 | + svc, ok := obj.(*corev1.Service) |
| 73 | + assert.True(t, ok) |
| 74 | + assert.Empty(t, svc.Spec.Selector) |
| 75 | + assert.Empty(t, svc.Spec.ExternalIPs) |
| 76 | + assert.NotEmpty(t, svc.Status.LoadBalancer.Ingress) |
| 77 | + }, |
| 78 | + }, |
| 79 | + { |
| 80 | + name: "all options", |
| 81 | + options: []func(*TransformOptions){ |
| 82 | + TransformWithSpecSelector(), |
| 83 | + TransformWithSpecExternalIPs(), |
| 84 | + TransformWithStatusLoadBalancer(), |
| 85 | + }, |
| 86 | + asserts: func(obj any) { |
| 87 | + svc, ok := obj.(*corev1.Service) |
| 88 | + assert.True(t, ok) |
| 89 | + assert.NotEmpty(t, svc.Spec.Selector) |
| 90 | + assert.NotEmpty(t, svc.Spec.ExternalIPs) |
| 91 | + assert.NotEmpty(t, svc.Status.LoadBalancer.Ingress) |
| 92 | + }, |
| 93 | + }, |
| 94 | + } |
| 95 | + |
| 96 | + for _, tt := range tests { |
| 97 | + t.Run(tt.name, func(t *testing.T) { |
| 98 | + transform := TransformerWithOptions[*corev1.Service](tt.options...) |
| 99 | + got, err := transform(base) |
| 100 | + require.NoError(t, err) |
| 101 | + tt.asserts(got) |
| 102 | + }) |
| 103 | + } |
| 104 | + |
| 105 | + t.Run("non-service input", func(t *testing.T) { |
| 106 | + transform := TransformerWithOptions[*corev1.Service]() |
| 107 | + out, err := transform("not-a-service") |
| 108 | + if err != nil { |
| 109 | + t.Fatalf("unexpected error: %v", err) |
| 110 | + } |
| 111 | + if out != nil { |
| 112 | + t.Errorf("expected nil output for non-service input, got %v", out) |
| 113 | + } |
| 114 | + }) |
| 115 | +} |
| 116 | + |
| 117 | +func TestTransformer_Service_WithFakeClient(t *testing.T) { |
| 118 | + t.Run("with transformer", func(t *testing.T) { |
| 119 | + ctx := t.Context() |
| 120 | + svc := fakeService() |
| 121 | + fakeClient := fake.NewClientset() |
| 122 | + |
| 123 | + _, err := fakeClient.CoreV1().Services(svc.Namespace).Create(ctx, svc, metav1.CreateOptions{}) |
| 124 | + require.NoError(t, err) |
| 125 | + |
| 126 | + factory := kubeinformers.NewSharedInformerFactoryWithOptions(fakeClient, 0, kubeinformers.WithNamespace(svc.Namespace)) |
| 127 | + serviceInformer := factory.Core().V1().Services() |
| 128 | + err = serviceInformer.Informer().SetTransform(TransformerWithOptions[*corev1.Service]( |
| 129 | + TransformWithSpecSelector(), |
| 130 | + TransformWithSpecExternalIPs(), |
| 131 | + TransformWithStatusLoadBalancer(), |
| 132 | + )) |
| 133 | + require.NoError(t, err) |
| 134 | + |
| 135 | + factory.Start(ctx.Done()) |
| 136 | + err = WaitForCacheSync(ctx, factory) |
| 137 | + require.NoError(t, err) |
| 138 | + |
| 139 | + got, err := serviceInformer.Lister().Services(svc.Namespace).Get(svc.Name) |
| 140 | + require.NoError(t, err) |
| 141 | + |
| 142 | + assert.Equal(t, svc.Spec.Selector, got.Spec.Selector) |
| 143 | + assert.Equal(t, svc.Spec.ExternalIPs, got.Spec.ExternalIPs) |
| 144 | + assert.Equal(t, svc.Status.LoadBalancer.Ingress, got.Status.LoadBalancer.Ingress) |
| 145 | + assert.NotEqual(t, svc.Annotations, got.Annotations) |
| 146 | + assert.NotEqual(t, svc.Labels, got.Labels) |
| 147 | + }) |
| 148 | + |
| 149 | + t.Run("without transformer", func(t *testing.T) { |
| 150 | + ctx := t.Context() |
| 151 | + svc := fakeService() |
| 152 | + fakeClient := fake.NewClientset() |
| 153 | + |
| 154 | + _, err := fakeClient.CoreV1().Services(svc.Namespace).Create(ctx, svc, metav1.CreateOptions{}) |
| 155 | + require.NoError(t, err) |
| 156 | + |
| 157 | + factory := kubeinformers.NewSharedInformerFactoryWithOptions(fakeClient, 0, kubeinformers.WithNamespace(svc.Namespace)) |
| 158 | + serviceInformer := factory.Core().V1().Services() |
| 159 | + |
| 160 | + err = serviceInformer.Informer().GetIndexer().Add(svc) |
| 161 | + require.NoError(t, err) |
| 162 | + |
| 163 | + factory.Start(ctx.Done()) |
| 164 | + err = WaitForCacheSync(ctx, factory) |
| 165 | + require.NoError(t, err) |
| 166 | + |
| 167 | + got, err := serviceInformer.Lister().Services(svc.Namespace).Get(svc.Name) |
| 168 | + require.NoError(t, err) |
| 169 | + |
| 170 | + assert.Equal(t, map[string]string{"app": "demo"}, got.Spec.Selector) |
| 171 | + assert.Equal(t, []string{"1.2.3.4"}, got.Spec.ExternalIPs) |
| 172 | + assert.Equal(t, svc.Status.LoadBalancer.Ingress, got.Status.LoadBalancer.Ingress) |
| 173 | + assert.Equal(t, svc.Annotations, got.Annotations) |
| 174 | + assert.Equal(t, svc.Labels, got.Labels) |
| 175 | + }) |
| 176 | +} |
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