knative.dev/pkg@v0.0.0-20260602142205-ac97e43f6622/network/domain_test.go (about)

     1  /*
     2  Copyright 2019 The Knative 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 network
    18  
    19  import (
    20  	"strings"
    21  	"testing"
    22  )
    23  
    24  func TestGetDomainName(t *testing.T) {
    25  	tests := []struct {
    26  		name       string
    27  		env        string
    28  		resolvConf string
    29  		want       string
    30  	}{{
    31  		name: "all good",
    32  		resolvConf: `
    33  nameserver 1.1.1.1
    34  search default.svc.abc.com svc.abc.com abc.com
    35  options ndots:5
    36  `,
    37  		want: "abc.com",
    38  	}, {
    39  		name: "env variable takes precedence over resolv.conf",
    40  		resolvConf: `
    41  nameserver 1.1.1.1
    42  search default.svc.abc.com svc.abc.com abc.com
    43  options ndots:5
    44  `,
    45  		env:  "mesh.net",
    46  		want: "mesh.net",
    47  	}, {
    48  		name:       "env variable used when resolv.conf is empty",
    49  		resolvConf: ``,
    50  		env:        "abc.com",
    51  		want:       "abc.com",
    52  	}, {
    53  		name: "all good with trailing dot",
    54  		resolvConf: `
    55  nameserver 1.1.1.1
    56  search default.svc.abc.com. svc.abc.com. abc.com.
    57  options ndots:5
    58  `,
    59  		want: "abc.com",
    60  	}, {
    61  		name: "missing search line",
    62  		resolvConf: `
    63  nameserver 1.1.1.1
    64  options ndots:5
    65  `,
    66  		want: defaultDomainName,
    67  	}, {
    68  		name: "non k8s resolv.conf format",
    69  		resolvConf: `
    70  nameserver 1.1.1.1
    71  search  abc.com xyz.com
    72  options ndots:5
    73  `,
    74  		want: defaultDomainName,
    75  	}}
    76  
    77  	for _, tt := range tests {
    78  		t.Run(tt.name, func(t *testing.T) {
    79  			if len(tt.env) > 0 {
    80  				t.Setenv(clusterDomainEnvKey, tt.env)
    81  			}
    82  			got := getClusterDomainName(strings.NewReader(tt.resolvConf))
    83  			if got != tt.want {
    84  				t.Errorf("Test %s failed expected: %s but got: %s", tt.name, tt.want, got)
    85  			}
    86  		})
    87  	}
    88  }