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resolve_test.go
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package utils
import (
"io/fs"
"testing"
"testing/fstest"
"github.com/google/go-cmp/cmp"
)
func TestExtractDNSServersFromResolvConf(t *testing.T) {
type args struct {
filesys fs.FS
filenames []string
}
tests := []struct {
name string
args args
want []string
wantErr bool
}{
{
name: "One file local dns empty result",
args: args{
filesys: fstest.MapFS{
"etc/resolv.conf": &fstest.MapFile{
Data: []byte(
`
# This is /run/systemd/resolve/stub-resolv.conf managed by man:systemd-resolved(8).
# Do not edit.
#
# This file might be symlinked as /etc/resolv.conf. If you're looking at
# /etc/resolv.conf and seeing this text, you have followed the symlink.
nameserver 127.0.0.53
options edns0 trust-ad
search .
`,
),
},
},
filenames: []string{"etc/resolv.conf"},
},
want: nil,
wantErr: false,
},
{
name: "One file with more than 3 dns servers",
args: args{
filesys: fstest.MapFS{
"etc/resolv.conf": &fstest.MapFile{
Data: []byte(
`
# This is /run/systemd/resolve/stub-resolv.conf managed by man:systemd-resolved(8).
# Do not edit.
#
# This file might be symlinked as /etc/resolv.conf. If you're looking at
# /etc/resolv.conf and seeing this text, you have followed the symlink.
nameserver 1.1.1.1
nameserver 1.1.1.2
nameserver 1.1.1.3
nameserver 1.1.1.4
nameserver 1.1.1.5
options edns0 trust-ad
search .
`,
),
},
},
filenames: []string{"etc/resolv.conf"},
},
want: []string{"1.1.1.1", "1.1.1.2", "1.1.1.3"},
wantErr: false,
},
{
name: "Two files local dns and two remote, two results",
args: args{
filesys: fstest.MapFS{
"etc/resolv.conf": &fstest.MapFile{
Data: []byte(
`
# This is /run/systemd/resolve/stub-resolv.conf managed by man:systemd-resolved(8).
# Do not edit.
#
# This file might be symlinked as /etc/resolv.conf. If you're looking at
# /etc/resolv.conf and seeing this text, you have followed the symlink.
nameserver 1.1.1.1
options edns0 trust-ad
search .
`,
),
},
"etc/someother/resolv.conf": &fstest.MapFile{
Data: []byte(
`
# This is /run/systemd/resolve/stub-resolv.conf managed by man:systemd-resolved(8).
# Do not edit.
nameserver 127.0.0.53
nameserver 8.8.8.8
options edns0 trust-ad
search .
`,
),
},
},
filenames: []string{"etc/resolv.conf", "etc/someother/resolv.conf"},
},
want: []string{"1.1.1.1", "8.8.8.8"},
wantErr: false,
},
{
name: "Duplicate 8.8.8.8",
args: args{
filesys: fstest.MapFS{
"etc/resolv.conf": &fstest.MapFile{
Data: []byte(
`
# Do not edit.
nameserver 1.1.1.1
nameserver 8.8.8.8
options edns0 trust-ad
search .
`,
),
},
"etc/someother/resolv.conf": &fstest.MapFile{
Data: []byte(
`
nameserver 2.2.2.2
nameserver 8.8.8.8
options edns0 trust-ad
search .
`,
),
},
},
filenames: []string{"etc/resolv.conf", "etc/someother/resolv.conf"},
},
want: []string{"1.1.1.1", "2.2.2.2", "8.8.8.8"},
wantErr: false,
},
{
name: "Files do not exist",
args: args{
filesys: fstest.MapFS{},
filenames: []string{"etc/resolv.conf", "etc/someother/resolv.conf"},
},
want: nil,
wantErr: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := ExtractDNSServersFromResolvConf(tt.args.filesys, tt.args.filenames)
if (err != nil) != tt.wantErr {
t.Errorf("ExtractDNSServerFromResolvConf() error = %v, wantErr %v", err, tt.wantErr)
return
}
if diff := cmp.Diff(got, tt.want); diff != "" {
t.Error(diff)
}
})
}
}