flowcontrol_test.go

Documentation: sigs.k8s.io/cli-utils/pkg/flowcontrol

     1  // Copyright 2022 The Kubernetes Authors.
     2  // SPDX-License-Identifier: Apache-2.0
     3  
     4  package flowcontrol
     5  
     6  import (
     7  	"bytes"
     8  	"io"
     9  	"net/http"
    10  	"net/http/httptest"
    11  	"testing"
    12  	"time"
    13  
    14  	"context"
    15  
    16  	"github.com/stretchr/testify/assert"
    17  	flowcontrolapi "k8s.io/api/flowcontrol/v1beta2"
    18  	"k8s.io/client-go/rest"
    19  	"sigs.k8s.io/cli-utils/pkg/testutil"
    20  )
    21  
    22  func TestIsEnabled(t *testing.T) {
    23  	testCases := []struct {
    24  		name            string
    25  		handler         func(*http.Request) *http.Response
    26  		expectedEnabled bool
    27  		expectedError   error
    28  	}{
    29  		{
    30  			name: "header found",
    31  			handler: func(req *http.Request) *http.Response {
    32  				defer req.Body.Close()
    33  				headers := http.Header{}
    34  				headers.Add(flowcontrolapi.ResponseHeaderMatchedFlowSchemaUID, "unused-uuid")
    35  
    36  				return &http.Response{
    37  					StatusCode: 200,
    38  					Header:     headers,
    39  					Body:       io.NopCloser(bytes.NewReader(nil)),
    40  				}
    41  			},
    42  			expectedEnabled: true,
    43  		},
    44  		{
    45  			name: "header not found",
    46  			handler: func(req *http.Request) *http.Response {
    47  				defer req.Body.Close()
    48  				return &http.Response{
    49  					StatusCode: 200,
    50  					Header:     http.Header{},
    51  					Body:       io.NopCloser(bytes.NewReader(nil)),
    52  				}
    53  			},
    54  			expectedEnabled: false,
    55  		},
    56  	}
    57  
    58  	for _, tc := range testCases {
    59  		t.Run(tc.name, func(t *testing.T) {
    60  			ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
    61  			defer cancel()
    62  
    63  			handler := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
    64  				assert.Equal(t, "/livez/ping", req.URL.Path)
    65  				resp := tc.handler(req)
    66  				defer resp.Body.Close()
    67  				for k, vs := range resp.Header {
    68  					w.Header().Del(k)
    69  					for _, v := range vs {
    70  						w.Header().Add(k, v)
    71  					}
    72  				}
    73  				w.WriteHeader(resp.StatusCode)
    74  				_, err := io.Copy(w, resp.Body)
    75  				assert.NoError(t, err)
    76  			})
    77  
    78  			server := httptest.NewServer(handler)
    79  			defer server.Close()
    80  
    81  			cfg := &rest.Config{
    82  				Host: server.URL,
    83  			}
    84  
    85  			enabled, err := IsEnabled(ctx, cfg)
    86  			testutil.AssertEqual(t, tc.expectedError, err)
    87  			assert.Equal(t, tc.expectedEnabled, enabled)
    88  		})
    89  	}
    90  }
    91
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