operator/pkg/tasks/init: test namespace init task

In this commit, we unit test the namespace init task in the operator
package making sure namespace is created successfully when this task is running.

Signed-off-by: Mohamed Awnallah <[email protected]>

operator/pkg/tasks/init/namespace_test.go

@@ -0,0 +1,123 @@
+/*
+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 tasks
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"testing"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	fakeclientset "k8s.io/client-go/kubernetes/fake"
+
+	"github.com/karmada-io/karmada/operator/pkg/util"
+	"github.com/karmada-io/karmada/operator/pkg/workflow"
+)
+
+func TestNewNamespaceTask(t *testing.T) {
+	tests := []struct {
+		name     string
+		wantTask workflow.Task
+	}{
+		{
+			name: "NewNamespaceTask_IsCalled_ExpectedWorkflowTask",
+			wantTask: workflow.Task{
+				Name: "Namespace",
+				Run:  runNamespace,
+			},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			namespaceTask := NewNamespaceTask()
+			if err := util.DeepEqualTasks(namespaceTask, test.wantTask); err != nil {
+				t.Errorf("unexpected error: %v", err)
+			}
+		})
+	}
+}
+
+func TestRunNamespace(t *testing.T) {
+	name, namespace := "karmada-demo", "test"
+	tests := []struct {
+		name    string
+		runData workflow.RunData
+		verify  func(workflow.RunData) error
+		wantErr bool
+		errMsg  string
+	}{
+		{
+			name:    "RunNamespace_InvalidTypeAssertion_TypeAssertionIsInvalid",
+			runData: &MyTestData{Data: "test"},
+			verify:  func(workflow.RunData) error { return nil },
+			wantErr: true,
+			errMsg:  "namespace task invoked with an invalid data struct",
+		},
+		{
+			name: "RunNamespace_CreateNamespace_NamespaceIsCreated",
+			runData: &TestInitData{
+				name:         name,
+				namespace:    namespace,
+				remoteClient: fakeclientset.NewSimpleClientset(),
+			},
+			verify: func(rd workflow.RunData) error {
+				_, ok := rd.(*TestInitData)
+				if !ok {
+					return fmt.Errorf("unexpected err, rundata interface doesn't implement TestInitData")
+				}
+
+				client := rd.(*TestInitData).RemoteClient()
+				actions := client.(*fakeclientset.Clientset).Actions()
+				if len(actions) != 2 {
+					return fmt.Errorf("expected 2 actions for getting and creating namespaces, but got %d", len(actions))
+				}
+
+				ns, err := client.CoreV1().Namespaces().Get(context.TODO(), namespace, metav1.GetOptions{})
+				if err != nil {
+					return fmt.Errorf("failed to get %s namespace with err %w", namespace, err)
+				}
+
+				if ns.Name != namespace {
+					return fmt.Errorf("expected %s namespace to be %s namespace", ns.Namespace, namespace)
+				}
+
+				return nil
+			},
+			wantErr: false,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			err := runNamespace(test.runData)
+			if err == nil && test.wantErr {
+				t.Errorf("expected an error, got none")
+			}
+			if err != nil && !test.wantErr {
+				t.Errorf("unexpected error: %v", err)
+			}
+			if err != nil && test.wantErr && !strings.Contains(err.Error(), test.errMsg) {
+				t.Errorf("expected %s error msg to contain %s", err.Error(), test.errMsg)
+			}
+			if err := test.verify(test.runData); err != nil {
+				t.Errorf("failed to verify the namespace running task, got err: %v", err)
+			}
+		})
+	}
+}