coredns/middleware/canonical_test.go

package middleware

import (
	"sort"
	"strings"
	"testing"
)

type set []string

func (p set) Len() int           { return len(p) }
func (p set) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
func (p set) Less(i, j int) bool { d := Less(p[i], p[j]); return d <= 0 }

func TestLess(t *testing.T) {
	tests := []struct {
		in  []string
		out []string
	}{
		{
			[]string{"aaa.powerdns.de", "bbb.powerdns.net.", "xxx.powerdns.com."},
			[]string{"xxx.powerdns.com.", "aaa.powerdns.de", "bbb.powerdns.net."},
		},
		{
			[]string{"aaa.POWERDNS.de", "bbb.PoweRdnS.net.", "xxx.powerdns.com."},
			[]string{"xxx.powerdns.com.", "aaa.POWERDNS.de", "bbb.PoweRdnS.net."},
		},
		{
			[]string{"aaa.aaaa.aa.", "aa.aaa.a.", "bbb.bbbb.bb."},
			[]string{"aa.aaa.a.", "aaa.aaaa.aa.", "bbb.bbbb.bb."},
		},
		{
			[]string{"aaaaa.", "aaa.", "bbb."},
			[]string{"aaa.", "aaaaa.", "bbb."},
		},
		{
			[]string{"a.a.a.a.", "a.a.", "a.a.a."},
			[]string{"a.a.", "a.a.a.", "a.a.a.a."},
		},
		{
			[]string{"example.", "z.example.", "a.example."},
			[]string{"example.", "a.example.", "z.example."},
		},
		{
			[]string{"a.example.", "Z.a.example.", "z.example.", "yljkjljk.a.example.", "\\001.z.example.", "example.", "*.z.example.", "\\200.z.example.", "zABC.a.EXAMPLE."},
			[]string{"example.", "a.example.", "yljkjljk.a.example.", "Z.a.example.", "zABC.a.EXAMPLE.", "z.example.", "\\001.z.example.", "*.z.example.", "\\200.z.example."},
		},
		{
			// RFC3034 example.
			[]string{"a.example.", "Z.a.example.", "z.example.", "yljkjljk.a.example.", "example.", "*.z.example.", "zABC.a.EXAMPLE."},
			[]string{"example.", "a.example.", "yljkjljk.a.example.", "Z.a.example.", "zABC.a.EXAMPLE.", "z.example.", "*.z.example."},
		},
	}

Tests:
	for j, test := range tests {
		// Need to lowercase these example as the Less function does lowercase for us anymore.
		for i, b := range test.in {
			test.in[i] = strings.ToLower(b)
		}
		for i, b := range test.out {
			test.out[i] = strings.ToLower(b)
		}

		sort.Sort(set(test.in))
		for i := 0; i < len(test.in); i++ {
			if test.in[i] != test.out[i] {
				t.Errorf("test %d: expected %s, got %s\n", j, test.out[i], test.in[i])
				n := ""
				for k, in := range test.in {
					if k+1 == len(test.in) {
						n = "\n"
					}
					t.Logf("%s <-> %s\n%s", in, test.out[k], n)
				}
				continue Tests
			}

		}
	}
}