chore: webhook add testing

pkg/webhook/pod_webhook_test.go

@@ -0,0 +1,115 @@
+package webhook
+
+import (
+	"context"
+	"encoding/json"
+	"gomodules.xyz/jsonpatch/v2"
+	"testing"
+
+	admissionv1 "k8s.io/api/admission/v1"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	"k8s.io/apimachinery/pkg/runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client/fake"
+	"sigs.k8s.io/controller-runtime/pkg/log/zap"
+	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPodAntiAffinityMutate_Handle(t *testing.T) {
+	scheme := runtime.NewScheme()
+	_ = corev1.AddToScheme(scheme)
+
+	fakeClient := fake.NewClientBuilder().WithScheme(scheme).Build()
+	decoder := admission.NewDecoder(scheme)
+	logger := zap.New(zap.WriteTo(nil))
+
+	mutator := NewPodAffiniytMutate(fakeClient, decoder, logger)
+
+	tests := []struct {
+		name            string
+		pod             *corev1.Pod
+		expectedPatches []jsonpatch.JsonPatchOperation
+	}{
+		{
+			name: "Should mutate pod with anti-affinity",
+			pod: &corev1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "redis-leader-0",
+					Namespace: "default",
+					Annotations: map[string]string{
+						annotationKeyEnablePodAntiAffinity: "true",
+						podAnnotationsRedisClusterApp:      "db-01",
+					},
+					Labels: map[string]string{
+						podLabelsRedisType: "redis-cluster",
+					},
+				},
+				Spec: corev1.PodSpec{},
+			},
+			expectedPatches: []jsonpatch.JsonPatchOperation{
+				{
+					Operation: "add",
+					Path:      "/spec/affinity",
+					Value: map[string]interface{}{
+						"podAntiAffinity": map[string]interface{}{
+							"requiredDuringSchedulingIgnoredDuringExecution": []interface{}{
+								map[string]interface{}{
+									"labelSelector": map[string]interface{}{
+										"matchExpressions": []interface{}{
+											map[string]interface{}{
+												"key":      "statefulset.kubernetes.io/pod-name",
+												"operator": "In",
+												"values":   []interface{}{"redis-follower-0"},
+											},
+										},
+									},
+									"topologyKey": "kubernetes.io/hostname",
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+		{
+			name: "Should not mutate pod without proper annotations",
+			pod: &corev1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "redis-follower-0",
+					Namespace: "default",
+					Annotations: map[string]string{
+						podAnnotationsRedisClusterApp: "db-01",
+					},
+					Labels: map[string]string{
+						podLabelsRedisType: "redis-cluster",
+					},
+				},
+				Spec: corev1.PodSpec{},
+			},
+			expectedPatches: nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			podBytes, err := json.Marshal(tt.pod)
+			assert.NoError(t, err)
+
+			req := admission.Request{
+				AdmissionRequest: admissionv1.AdmissionRequest{
+					Namespace: "default",
+					Object: runtime.RawExtension{
+						Raw: podBytes,
+					},
+				},
+			}
+
+			resp := mutator.Handle(context.Background(), req)
+			assert.True(t, resp.Allowed)
+			assert.Equal(t, tt.expectedPatches, resp.Patches)
+		})
+	}
+}