operator/pkg/util: unit test endpoint

In this commit, we unit test endpoint on getting control plane
endpoint and API Service IP.

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

operator/pkg/util/endpoint_test.go

@@ -0,0 +1,182 @@
+/*
+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 util
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"testing"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	clientset "k8s.io/client-go/kubernetes"
+	fakeclientset "k8s.io/client-go/kubernetes/fake"
+)
+
+func TestGetControlPlaneEndpoint(t *testing.T) {
+	tests := []struct {
+		name         string
+		address      string
+		port         string
+		wantErr      bool
+		wantEndpoint string
+	}{
+		{
+			name:    "GetControlplaneEndpoint_InvalidAddress_AddressIsInvalid",
+			address: "192.168:1:1",
+			port:    "6060",
+			wantErr: true,
+		},
+		{
+			name:         "GetControlplaneEndpoint_ParseEndpoint_EndpointParsed",
+			address:      "192.168.1.1",
+			port:         "6060",
+			wantErr:      false,
+			wantEndpoint: "https://192.168.1.1:6060",
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			controlPlaneEndpoint, err := GetControlplaneEndpoint(test.address, test.port)
+			if err == nil && test.wantErr {
+				t.Errorf("expected an error, but got none")
+			}
+			if err != nil && !test.wantErr {
+				t.Errorf("unexpected error, got: %v", err)
+			}
+			if controlPlaneEndpoint != test.wantEndpoint {
+				t.Errorf("expected endpoint %s, but got %s", test.wantEndpoint, controlPlaneEndpoint)
+			}
+		})
+	}
+}
+
+func TestGetAPIServiceIP(t *testing.T) {
+	tests := []struct {
+		name             string
+		client           clientset.Interface
+		prep             func(clientset.Interface) error
+		wantAPIServiceIP string
+		wantErr          bool
+		errMsg           string
+	}{
+		{
+			name:    "GetAPIServiceIP_WithNoNodesInTheCluster_FailedToGetAPIServiceIP",
+			client:  fakeclientset.NewSimpleClientset(),
+			prep:    func(clientset.Interface) error { return nil },
+			wantErr: true,
+			errMsg:  "there are no nodes in cluster",
+		},
+		{
+			name:   "GetAPIServiceIP_WithoutMasterNode_WorkerNodeAPIServiceIPReturned",
+			client: fakeclientset.NewSimpleClientset(),
+			prep: func(client clientset.Interface) error {
+				nodes := []*corev1.Node{
+					{
+						ObjectMeta: metav1.ObjectMeta{
+							Name: "node-1",
+						},
+						Status: corev1.NodeStatus{
+							Addresses: []corev1.NodeAddress{
+								{
+									Type:    corev1.NodeInternalIP,
+									Address: "192.168.1.2",
+								},
+							},
+						},
+					},
+				}
+				for _, node := range nodes {
+					_, err := client.CoreV1().Nodes().Create(context.TODO(), node, metav1.CreateOptions{})
+					if err != nil {
+						return fmt.Errorf("failed to create node %s: %v", node.Name, err)
+					}
+				}
+				return nil
+			},
+			wantErr:          false,
+			wantAPIServiceIP: "192.168.1.2",
+		},
+		{
+			name:   "GetAPIServiceIP_WithMasterNode_MasterNodeAPIServiceIPReturned",
+			client: fakeclientset.NewSimpleClientset(),
+			prep: func(client clientset.Interface) error {
+				nodes := []*corev1.Node{
+					{
+						ObjectMeta: metav1.ObjectMeta{
+							Name: "node-1",
+							Labels: map[string]string{
+								"node-role.kubernetes.io/master": "",
+							},
+						},
+						Status: corev1.NodeStatus{
+							Addresses: []corev1.NodeAddress{
+								{
+									Type:    corev1.NodeInternalIP,
+									Address: "192.168.1.1",
+								},
+							},
+						},
+					},
+					{
+						ObjectMeta: metav1.ObjectMeta{
+							Name: "node-2",
+						},
+						Status: corev1.NodeStatus{
+							Addresses: []corev1.NodeAddress{
+								{
+									Type:    corev1.NodeInternalIP,
+									Address: "192.168.1.2",
+								},
+							},
+						},
+					},
+				}
+				for _, node := range nodes {
+					_, err := client.CoreV1().Nodes().Create(context.TODO(), node, metav1.CreateOptions{})
+					if err != nil {
+						return fmt.Errorf("failed to create node %s: %v", node.Name, err)
+					}
+				}
+				return nil
+			},
+			wantErr:          false,
+			wantAPIServiceIP: "192.168.1.1",
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if err := test.prep(test.client); err != nil {
+				t.Errorf("failed to prep before getting API service IP: %v", err)
+			}
+			apiServiceIP, err := GetAPIServiceIP(test.client)
+			if err == nil && test.wantErr {
+				t.Errorf("expected an error, but got none")
+			}
+			if err != nil && !test.wantErr {
+				t.Errorf("unexpected error, got: %v", err)
+			}
+			if err != nil && test.wantErr && !strings.Contains(err.Error(), test.errMsg) {
+				t.Errorf("expected error message %s to be in %s", test.errMsg, err.Error())
+			}
+			if apiServiceIP != test.wantAPIServiceIP {
+				t.Errorf("expected API service IP %s, but got %s", test.wantAPIServiceIP, apiServiceIP)
+			}
+		})
+	}
+}