Merge pull request #44267 from zjj2wry/005-f

Automatic merge from submit-queue (batch tested with PRs 43000, 44500, 44457, 44553, 44267)

add kubectl config view test code

**What this PR does / why we need it**:
kubectl config view test code

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:
think you very much :)

**Release note**:

```release-note
```

pkg/kubectl/cmd/config/BUILD

@@ -58,6 +58,7 @@ go_test(
         "navigation_step_parser_test.go",
         "unset_test.go",
         "use_context_test.go",
+        "view_test.go",
     ],
     library = ":go_default_library",
     tags = ["automanaged"],

pkg/kubectl/cmd/config/view_test.go

@@ -0,0 +1,155 @@
+/*
+Copyright 2017 The Kubernetes 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 config
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"k8s.io/client-go/tools/clientcmd"
+	clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
+)
+
+type viewClusterTest struct {
+	description string
+	config      clientcmdapi.Config //initiate kubectl config
+	flags       []string            //kubectl config viw flags
+	expected    string              //expect out
+}
+
+func TestViewCluster(t *testing.T) {
+	conf := clientcmdapi.Config{
+		Kind:       "Config",
+		APIVersion: "v1",
+		Clusters: map[string]*clientcmdapi.Cluster{
+			"minikube":   {Server: "https://192.168.99.100:8443"},
+			"my-cluster": {Server: "https://192.168.0.1:3434"},
+		},
+		Contexts: map[string]*clientcmdapi.Context{
+			"minikube":  {AuthInfo: "minikube", Cluster: "minikube"},
+			"my-cluser": {AuthInfo: "mu-cluster", Cluster: "my-cluster"},
+		},
+		CurrentContext: "minikube",
+		AuthInfos: map[string]*clientcmdapi.AuthInfo{
+			"minikube":  {Token: "minikube-token"},
+			"my-cluser": {Token: "minikube-token"},
+		},
+	}
+	test := viewClusterTest{
+		description: "Testing for kubectl config view",
+		config:      conf,
+		flags:       []string{},
+		expected: `apiVersion: v1
+clusters:
+- cluster:
+    server: https://192.168.99.100:8443
+  name: minikube
+- cluster:
+    server: https://192.168.0.1:3434
+  name: my-cluster
+contexts:
+- context:
+    cluster: minikube
+    user: minikube
+  name: minikube
+- context:
+    cluster: my-cluster
+    user: mu-cluster
+  name: my-cluser
+current-context: minikube
+kind: Config
+preferences: {}
+users:
+- name: minikube
+  user:
+    token: minikube-token
+- name: my-cluser
+  user:
+    token: minikube-token` + "\n"}
+	test.run(t)
+}
+
+func TestViewClusterMinify(t *testing.T) {
+	conf := clientcmdapi.Config{
+		Kind:       "Config",
+		APIVersion: "v1",
+		Clusters: map[string]*clientcmdapi.Cluster{
+			"minikube":   {Server: "https://192.168.99.100:8443"},
+			"my-cluster": {Server: "https://192.168.0.1:3434"},
+		},
+		Contexts: map[string]*clientcmdapi.Context{
+			"minikube":  {AuthInfo: "minikube", Cluster: "minikube"},
+			"my-cluser": {AuthInfo: "mu-cluster", Cluster: "my-cluster"},
+		},
+		CurrentContext: "minikube",
+		AuthInfos: map[string]*clientcmdapi.AuthInfo{
+			"minikube":  {Token: "minikube-token"},
+			"my-cluser": {Token: "minikube-token"},
+		},
+	}
+	test := viewClusterTest{
+		description: "Testing for kubectl config view --minify=true",
+		config:      conf,
+		flags:       []string{"--minify=true"},
+		expected: `apiVersion: v1
+clusters:
+- cluster:
+    server: https://192.168.99.100:8443
+  name: minikube
+contexts:
+- context:
+    cluster: minikube
+    user: minikube
+  name: minikube
+current-context: minikube
+kind: Config
+preferences: {}
+users:
+- name: minikube
+  user:
+    token: minikube-token` + "\n"}
+	test.run(t)
+}
+
+func (test viewClusterTest) run(t *testing.T) {
+	fakeKubeFile, err := ioutil.TempFile(os.TempDir(), "")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	defer os.Remove(fakeKubeFile.Name())
+	err = clientcmd.WriteToFile(test.config, fakeKubeFile.Name())
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	pathOptions := clientcmd.NewDefaultPathOptions()
+	pathOptions.GlobalFile = fakeKubeFile.Name()
+	pathOptions.EnvVar = ""
+	buf := bytes.NewBuffer([]byte{})
+	errBuf := bytes.NewBuffer([]byte{})
+	cmd := NewCmdConfigView(buf, errBuf, pathOptions)
+	cmd.Flags().Parse(test.flags)
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("unexpected error executing command: %v,kubectl config view flags: %v", err, test.flags)
+	}
+	if len(test.expected) != 0 {
+		if buf.String() != test.expected {
+			t.Errorf("Failed in %q\n expected %v\n but got %v\n", test.description, test.expected, buf.String())
+		}
+	}
+}