Add UTs to plugins

Deployment, service and namespace are plugins which offers CRUD
operations to manage their resources. They haven't implemented
Unit Tests which makes fragile to change/refactor the source code.
This change adds their corresponding Unit Tests and defines a
standard interface.

Change-Id: I1e1eb40f1a18ba33c74069a117462c8df17767ac
Signed-off-by: Victor Morales <victor.morales@intel.com>
Issue-ID: MULTICLOUD-301

2 files changed, 222 insertions, 22 deletions

diff --git a/src/k8splugin/plugins/namespace/plugin.go b/src/k8splugin/plugins/namespace/plugin.go
index 986de863..e29ff43d 100644
--- a/src/k8splugin/plugins/namespace/plugin.go
+++ b/src/k8splugin/plugins/namespace/plugin.go
@@ -14,55 +14,85 @@ limitations under the License.
 package main
 
 import (
+	"log"
+
+	"k8s.io/client-go/kubernetes"
+
 	pkgerrors "github.com/pkg/errors"
 
 	coreV1 "k8s.io/api/core/v1"
 	metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/client-go/kubernetes"
+
+	"k8splugin/krd"
 )
 
-// CreateResource is used to create a new Namespace
-func CreateResource(namespace string, client *kubernetes.Clientset) error {
-	namespaceStruct := &coreV1.Namespace{
+// Create a namespace object in a specific Kubernetes cluster
+func Create(data *krd.ResourceData, client kubernetes.Interface) (string, error) {
+	namespace := &coreV1.Namespace{
 		ObjectMeta: metaV1.ObjectMeta{
-			Name: namespace,
+			Name: data.Namespace,
 		},
 	}
-	_, err := client.CoreV1().Namespaces().Create(namespaceStruct)
+	_, err := client.CoreV1().Namespaces().Create(namespace)
 	if err != nil {
-		return pkgerrors.Wrap(err, "Create Namespace error")
+		return "", pkgerrors.Wrap(err, "Create Namespace error")
 	}
-	return nil
+	return data.Namespace, nil
 }
 
-// GetResource is used to check if a given namespace actually exists in Kubernetes
-func GetResource(namespace string, client *kubernetes.Clientset) (bool, error) {
+// Get an existing namespace hosted in a specific Kubernetes cluster
+func Get(name string, namespace string, client kubernetes.Interface) (string, error) {
 	opts := metaV1.ListOptions{}
 
-	namespaceList, err := client.CoreV1().Namespaces().List(opts)
+	list, err := client.CoreV1().Namespaces().List(opts)
 	if err != nil {
-		return false, pkgerrors.Wrap(err, "Get Namespace list error")
+		return "", pkgerrors.Wrap(err, "Get Namespace list error")
 	}
 
-	for _, ns := range namespaceList.Items {
+	for _, ns := range list.Items {
 		if namespace == ns.Name {
-			return true, nil
+			return ns.Name, nil
 		}
 	}
 
-	return false, nil
+	return "", nil
 }
 
-// DeleteResource is used to delete a namespace
-func DeleteResource(namespace string, client *kubernetes.Clientset) error {
+// Delete an existing namespace hosted in a specific Kubernetes cluster
+func Delete(name string, namespace string, client kubernetes.Interface) error {
 	deletePolicy := metaV1.DeletePropagationForeground
-
-	err := client.CoreV1().Namespaces().Delete(namespace, &metaV1.DeleteOptions{
+	opts := &metaV1.DeleteOptions{
 		PropagationPolicy: &deletePolicy,
-	})
+	}
 
-	if err != nil {
-		return pkgerrors.Wrap(err, "Delete Namespace error")
+	log.Println("Deleting namespace: " + name)
+	if err := client.CoreV1().Namespaces().Delete(name, opts); err != nil {
+		return pkgerrors.Wrap(err, "Delete namespace error")
 	}
+
 	return nil
 }
+
+// List of existing namespaces hosted in a specific Kubernetes cluster
+func List(namespace string, client kubernetes.Interface) ([]string, error) {
+	opts := metaV1.ListOptions{
+		Limit: krd.ResourcesListLimit,
+	}
+	opts.APIVersion = "apps/v1"
+	opts.Kind = "Namespace"
+
+	list, err := client.CoreV1().Namespaces().List(opts)
+	if err != nil {
+		return nil, pkgerrors.Wrap(err, "Get Namespace list error")
+	}
+
+	result := make([]string, 0, krd.ResourcesListLimit)
+	if list != nil {
+		for _, deployment := range list.Items {
+			log.Printf("%v", deployment.Name)
+			result = append(result, deployment.Name)
+		}
+	}
+
+	return result, nil
+}
diff --git a/src/k8splugin/plugins/namespace/plugin_test.go b/src/k8splugin/plugins/namespace/plugin_test.go
new file mode 100644
index 00000000..fe60404d
--- /dev/null
+++ b/src/k8splugin/plugins/namespace/plugin_test.go
@@ -0,0 +1,170 @@
+// +build unit
+
+/*
+Copyright 2018 Intel Corporation.
+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 main
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+
+	"k8splugin/krd"
+
+	coreV1 "k8s.io/api/core/v1"
+	metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	testclient "k8s.io/client-go/kubernetes/fake"
+)
+
+func TestCreateNamespace(t *testing.T) {
+	namespace := "test1"
+	testCases := []struct {
+		label          string
+		input          *krd.ResourceData
+		clientOutput   *coreV1.Namespace
+		expectedResult string
+		expectedError  string
+	}{
+		{
+			label: "Successfully create a namespace",
+			input: &krd.ResourceData{
+				Namespace: namespace,
+			},
+			clientOutput:   &coreV1.Namespace{},
+			expectedResult: namespace,
+		},
+	}
+
+	for _, testCase := range testCases {
+		client := testclient.NewSimpleClientset(testCase.clientOutput)
+		t.Run(testCase.label, func(t *testing.T) {
+			result, err := Create(testCase.input, client)
+			if err != nil {
+				if !strings.Contains(string(err.Error()), testCase.expectedError) {
+					t.Fatalf("Create method returned an error (%s)", err)
+				}
+			}
+			if !reflect.DeepEqual(testCase.expectedResult, result) {
+				t.Fatalf("Create method returned %v and it was expected (%v)", result, testCase.expectedResult)
+			}
+		})
+	}
+}
+
+func TestListNamespace(t *testing.T) {
+	namespace := "test1"
+	testCases := []struct {
+		label          string
+		input          string
+		clientOutput   *coreV1.NamespaceList
+		expectedResult []string
+	}{
+		{
+			label:          "Sucessfully to display an empty namespace list",
+			input:          namespace,
+			clientOutput:   &coreV1.NamespaceList{},
+			expectedResult: []string{},
+		},
+		{
+			label: "Sucessfully to display a list of existing namespaces",
+			input: namespace,
+			clientOutput: &coreV1.NamespaceList{
+				Items: []coreV1.Namespace{
+					coreV1.Namespace{
+						ObjectMeta: metaV1.ObjectMeta{
+							Name: namespace,
+						},
+					},
+				},
+			},
+			expectedResult: []string{namespace},
+		},
+	}
+
+	for _, testCase := range testCases {
+		client := testclient.NewSimpleClientset(testCase.clientOutput)
+		t.Run(testCase.label, func(t *testing.T) {
+			result, err := List(testCase.input, client)
+			if err != nil {
+				t.Fatalf("List method returned an error (%s)", err)
+			}
+			if !reflect.DeepEqual(testCase.expectedResult, result) {
+				t.Fatalf("List method returned %v and it was expected (%v)", result, testCase.expectedResult)
+			}
+		})
+	}
+}
+
+func TestDeleteNamespace(t *testing.T) {
+	namespace := "test1"
+	testCases := []struct {
+		label        string
+		input        string
+		clientOutput *coreV1.Namespace
+	}{
+		{
+			label: "Sucessfully to delete an existing namespace",
+			input: namespace,
+			clientOutput: &coreV1.Namespace{
+				ObjectMeta: metaV1.ObjectMeta{
+					Name: namespace,
+				},
+			},
+		},
+	}
+
+	for _, testCase := range testCases {
+		client := testclient.NewSimpleClientset(testCase.clientOutput)
+		t.Run(testCase.label, func(t *testing.T) {
+			err := Delete(testCase.input, namespace, client)
+			if err != nil {
+				t.Fatalf("Delete method returned an error (%s)", err)
+			}
+		})
+	}
+}
+
+func TestGetNamespace(t *testing.T) {
+	namespace := "test1"
+	testCases := []struct {
+		label          string
+		input          string
+		clientOutput   *coreV1.Namespace
+		expectedResult string
+	}{
+		{
+			label: "Sucessfully to get an existing namespace",
+			input: namespace,
+			clientOutput: &coreV1.Namespace{
+				ObjectMeta: metaV1.ObjectMeta{
+					Name: namespace,
+				},
+			},
+			expectedResult: namespace,
+		},
+	}
+
+	for _, testCase := range testCases {
+		client := testclient.NewSimpleClientset(testCase.clientOutput)
+		t.Run(testCase.label, func(t *testing.T) {
+			result, err := Get(testCase.input, namespace, client)
+			if err != nil {
+				t.Fatalf("Get method returned an error (%s)", err)
+			}
+			if !reflect.DeepEqual(testCase.expectedResult, result) {
+				t.Fatalf("Get method returned %v and it was expected (%v)", result, testCase.expectedResult)
+			}
+		})
+	}
+}