Test token output

Tested JSON, YAML, Go Template and Text token output formats.

cmd/kubeadm/app/cmd/token_test.go

@@ -32,6 +32,9 @@ import (
 	core "k8s.io/client-go/testing"
 	"k8s.io/client-go/tools/clientcmd"
 	kubeadmapiv1beta2 "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta2"
+	outputapischeme "k8s.io/kubernetes/cmd/kubeadm/app/apis/output/scheme"
+	outputapiv1alpha1 "k8s.io/kubernetes/cmd/kubeadm/app/apis/output/v1alpha1"
+	"k8s.io/kubernetes/cmd/kubeadm/app/util/output"
 )
 
 const (
@@ -332,3 +335,125 @@ func TestRunDeleteTokens(t *testing.T) {
 		t.Errorf("RunDeleteToken() succeeded for an invalid token: %v", err)
 	}
 }
+
+func TestTokenOutput(t *testing.T) {
+	testCases := []struct {
+		name          string
+		id            string
+		secret        string
+		description   string
+		usages        []string
+		extraGroups   []string
+		outputFormat  string
+		expectedBytes []byte
+	}{
+		{
+			name:         "JSON output",
+			id:           "abcdef",
+			secret:       "1234567890123456",
+			description:  "valid bootstrap tooken",
+			usages:       []string{"signing", "authentication"},
+			extraGroups:  []string{"system:bootstrappers:kubeadm:default-node-token"},
+			outputFormat: "json",
+			expectedBytes: []byte(`{
+    "kind": "BootstrapToken",
+    "apiVersion": "output.kubeadm.k8s.io/v1alpha1",
+    "creationTimestamp": null,
+    "token": "abcdef.1234567890123456",
+    "description": "valid bootstrap tooken",
+    "usages": [
+        "signing",
+        "authentication"
+    ],
+    "groups": [
+        "system:bootstrappers:kubeadm:default-node-token"
+    ]
+}
+`),
+		},
+		{
+			name:         "YAML output",
+			id:           "abcdef",
+			secret:       "1234567890123456",
+			description:  "valid bootstrap tooken",
+			usages:       []string{"signing", "authentication"},
+			extraGroups:  []string{"system:bootstrappers:kubeadm:default-node-token"},
+			outputFormat: "yaml",
+			expectedBytes: []byte(`apiVersion: output.kubeadm.k8s.io/v1alpha1
+creationTimestamp: null
+description: valid bootstrap tooken
+groups:
+- system:bootstrappers:kubeadm:default-node-token
+kind: BootstrapToken
+token: abcdef.1234567890123456
+usages:
+- signing
+- authentication
+`),
+		},
+		{
+			name:         "Go template output",
+			id:           "abcdef",
+			secret:       "1234567890123456",
+			description:  "valid bootstrap tooken",
+			usages:       []string{"signing", "authentication"},
+			extraGroups:  []string{"system:bootstrappers:kubeadm:default-node-token"},
+			outputFormat: "go-template={{println .token .description .usages .groups}}",
+			expectedBytes: []byte(`abcdef.1234567890123456 valid bootstrap tooken [signing authentication] [system:bootstrappers:kubeadm:default-node-token]
+`),
+		},
+		{
+			name:         "text output",
+			id:           "abcdef",
+			secret:       "1234567890123456",
+			description:  "valid bootstrap tooken",
+			usages:       []string{"signing", "authentication"},
+			extraGroups:  []string{"system:bootstrappers:kubeadm:default-node-token"},
+			outputFormat: "text",
+			expectedBytes: []byte(`TOKEN                     TTL         EXPIRES   USAGES                   DESCRIPTION                                                EXTRA GROUPS
+abcdef.1234567890123456   <forever>   <never>   signing,authentication   valid bootstrap tooken                                     system:bootstrappers:kubeadm:default-node-token
+`),
+		},
+		{
+			name:          "jsonpath output",
+			id:            "abcdef",
+			secret:        "1234567890123456",
+			description:   "valid bootstrap tooken",
+			usages:        []string{"signing", "authentication"},
+			extraGroups:   []string{"system:bootstrappers:kubeadm:default-node-token"},
+			outputFormat:  "jsonpath={.token} {.groups}",
+			expectedBytes: []byte(`abcdef.1234567890123456 [system:bootstrappers:kubeadm:default-node-token]`),
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			token := outputapiv1alpha1.BootstrapToken{
+				BootstrapToken: kubeadmapiv1beta2.BootstrapToken{
+					Token:       &kubeadmapiv1beta2.BootstrapTokenString{ID: tc.id, Secret: tc.secret},
+					Description: tc.description,
+					Usages:      tc.usages,
+					Groups:      tc.extraGroups,
+				},
+			}
+			buf := bytes.NewBufferString("")
+			outputFlags := output.NewOutputFlags(&tokenTextPrintFlags{}).WithTypeSetter(outputapischeme.Scheme).WithDefaultOutput(tc.outputFormat)
+			printer, err := outputFlags.ToPrinter()
+			if err != nil {
+				t.Errorf("can't create printer for output format %s: %+v", tc.outputFormat, err)
+			}
+
+			if err := printer.PrintObj(&token, buf); err != nil {
+				t.Errorf("unable to print token %s: %+v", token.Token, err)
+			}
+
+			actualBytes := buf.Bytes()
+			if !bytes.Equal(actualBytes, tc.expectedBytes) {
+				t.Errorf(
+					"failed TestTokenOutput:\n\nexpected:\n%s\n\nactual:\n%s",
+					string(tc.expectedBytes),
+					string(actualBytes),
+				)
+			}
+		})
+	}
+}