addlabel_test.go

Documentation: k8s.io/kubernetes/test/images/agnhost/webhook

     1  /*
     2  Copyright 2019 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package webhook
    18  
    19  import (
    20  	"encoding/json"
    21  	"reflect"
    22  	"testing"
    23  
    24  	jsonpatch "github.com/evanphx/json-patch"
    25  	"k8s.io/api/admission/v1"
    26  	corev1 "k8s.io/api/core/v1"
    27  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    28  	"k8s.io/apimachinery/pkg/runtime"
    29  )
    30  
    31  func TestAddLabel(t *testing.T) {
    32  	testCases := []struct {
    33  		name           string
    34  		initialLabels  map[string]string
    35  		expectedLabels map[string]string
    36  	}{
    37  		{
    38  			name:           "add first label",
    39  			initialLabels:  nil,
    40  			expectedLabels: map[string]string{"added-label": "yes"},
    41  		},
    42  		{
    43  			name:           "add second label",
    44  			initialLabels:  map[string]string{"other-label": "yes"},
    45  			expectedLabels: map[string]string{"other-label": "yes", "added-label": "yes"},
    46  		},
    47  		{
    48  			name:           "idempotent update label",
    49  			initialLabels:  map[string]string{"added-label": "yes"},
    50  			expectedLabels: map[string]string{"added-label": "yes"},
    51  		},
    52  	}
    53  
    54  	for _, tc := range testCases {
    55  		t.Run(tc.name, func(t *testing.T) {
    56  			request := corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Labels: tc.initialLabels}}
    57  			raw, err := json.Marshal(request)
    58  			if err != nil {
    59  				t.Fatal(err)
    60  			}
    61  			review := v1.AdmissionReview{Request: &v1.AdmissionRequest{Object: runtime.RawExtension{Raw: raw}}}
    62  			response := addLabel(review)
    63  			if response.Patch != nil {
    64  				patchObj, err := jsonpatch.DecodePatch(response.Patch)
    65  				if err != nil {
    66  					t.Fatal(err)
    67  				}
    68  				raw, err = patchObj.Apply(raw)
    69  				if err != nil {
    70  					t.Fatal(err)
    71  				}
    72  			}
    73  
    74  			objType := reflect.TypeOf(request)
    75  			objTest := reflect.New(objType).Interface()
    76  			err = json.Unmarshal(raw, objTest)
    77  			if err != nil {
    78  				t.Fatal(err)
    79  			}
    80  			actual := objTest.(*corev1.ConfigMap)
    81  			if !reflect.DeepEqual(actual.Labels, tc.expectedLabels) {
    82  				t.Errorf("\nexpected %#v, got %#v, patch: %v", actual.Labels, tc.expectedLabels, string(response.Patch))
    83  			}
    84  		})
    85  	}
    86  }
    87
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