operator/pkg: test webhook configurations

In this commit, we introduce unit tests for mutating and validating webhook
configurations to make sure they are working as expected.

Signed-off-by: Mohamed Awnallah <mohamedmohey2352@gmail.com>

operator/pkg/karmadaresource/webhookconfiguration/webhookconfiguration_test.go

@@ -0,0 +1,130 @@
+/*
+Copyright 2024 The Karmada 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 webhookconfiguration
+
+import (
+	"encoding/base64"
+	"fmt"
+	"strings"
+	"testing"
+
+	admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
+	fakeclientset "k8s.io/client-go/kubernetes/fake"
+	coretesting "k8s.io/client-go/testing"
+
+	"github.com/karmada-io/karmada/operator/pkg/util"
+)
+
+func TestEnsureWebhookConfiguration(t *testing.T) {
+	name, namespace := "karmada-demo", "test"
+
+	// Base64 encoding of the dummy certificate data.
+	caTestData := "test-ca-data"
+	caBundle := base64.StdEncoding.EncodeToString([]byte(caTestData))
+
+	fakeClient := fakeclientset.NewSimpleClientset()
+	err := EnsureWebhookConfiguration(fakeClient, namespace, name, caBundle)
+	if err != nil {
+		t.Fatalf("failed to create karmada mutating webhook configuration and validation webhook configuration: %v", err)
+	}
+
+	// Ensure the expected action (mutating webhook configuration and validating webhook configuration creation) occurred.
+	actions := fakeClient.Actions()
+	if len(actions) != 2 {
+		t.Fatalf("expected 2 actions, but got %d", len(actions))
+	}
+}
+
+func TestMutatingWebhookConfiguration(t *testing.T) {
+	name, namespace := "karmada-demo", "test"
+
+	// Base64 encoding of the dummy certificate data.
+	caTestData := "test-ca-data"
+	caBundle := base64.StdEncoding.EncodeToString([]byte(caTestData))
+
+	fakeClient := fakeclientset.NewSimpleClientset()
+	err := mutatingWebhookConfiguration(fakeClient, namespace, name, caBundle)
+	if err != nil {
+		t.Fatalf("error creating the mutating webhook configuration: %v", err)
+	}
+
+	// Ensure the expected action (mutating webhook configuration creation) occurred on the fake clientset.
+	actions := fakeClient.Actions()
+	if len(actions) != 1 {
+		t.Fatalf("expected 1 action, but got %d", len(actions))
+	}
+
+	// Validate the action is a CreateAction and it's for the correct resource (MutatingWebhookConfiguration).
+	createAction, ok := actions[0].(coretesting.CreateAction)
+	if !ok {
+		t.Fatalf("expected CreateAction, but got %T", actions[0])
+	}
+
+	// Validate the created MutatingWebhookConfiguration object.
+	mutatingWebhookConfig := createAction.GetObject().(*admissionregistrationv1.MutatingWebhookConfiguration)
+	serviceName := util.KarmadaWebhookName(name)
+	for _, webhook := range mutatingWebhookConfig.Webhooks {
+		clientConfigRootURL := fmt.Sprintf("https://%s.%s.svc:443", serviceName, namespace)
+		if !strings.HasPrefix(*webhook.ClientConfig.URL, clientConfigRootURL) {
+			t.Errorf("expected webhook client config url '%s' to start with '%s'", *webhook.ClientConfig.URL, clientConfigRootURL)
+		}
+
+		if string(webhook.ClientConfig.CABundle) != caTestData {
+			t.Fatalf("expected webhook client config caBundle %s, but got %s", caTestData, string(webhook.ClientConfig.CABundle))
+		}
+	}
+}
+
+func TestValidatingWebhookConfiguration(t *testing.T) {
+	name, namespace := "karmada-demo", "test"
+
+	// Base64 encoding of the dummy certificate data.
+	caTestData := "test-ca-data"
+	caBundle := base64.StdEncoding.EncodeToString([]byte(caTestData))
+
+	fakeClient := fakeclientset.NewSimpleClientset()
+	err := validatingWebhookConfiguration(fakeClient, namespace, name, caBundle)
+	if err != nil {
+		t.Fatalf("error creating the mutating webhook configuration: %v", err)
+	}
+
+	// Ensure the expected action (validating webhook configuration creation) occurred on the fake clientset.
+	actions := fakeClient.Actions()
+	if len(actions) != 1 {
+		t.Fatalf("expected 1 action, but got %d", len(actions))
+	}
+
+	// Validate the action is a CreateAction and it's for the correct resource (ValidatingWebhookConfiguration).
+	createAction, ok := actions[0].(coretesting.CreateAction)
+	if !ok {
+		t.Fatalf("expected CreateAction, but got %T", actions[0])
+	}
+
+	// Validate the created ValidatingWebhookConfiguration object.
+	mutatingWebhookConfig := createAction.GetObject().(*admissionregistrationv1.ValidatingWebhookConfiguration)
+	serviceName := util.KarmadaWebhookName(name)
+	for _, webhook := range mutatingWebhookConfig.Webhooks {
+		clientConfigRootURL := fmt.Sprintf("https://%s.%s.svc:443", serviceName, namespace)
+		if !strings.HasPrefix(*webhook.ClientConfig.URL, clientConfigRootURL) {
+			t.Errorf("expected webhook client config url '%s' to start with '%s'", *webhook.ClientConfig.URL, clientConfigRootURL)
+		}
+
+		if string(webhook.ClientConfig.CABundle) != caTestData {
+			t.Fatalf("expected webhook client config caBundle %s, but got %s", caTestData, string(webhook.ClientConfig.CABundle))
+		}
+	}
+}