libgo/go/encoding/hex/hex_test.go

   1 // Copyright 2009 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package hex
   6
   7 import (
   8         "bytes"
   9         "testing"
  10 )
  11
  12 type encDecTest struct {
  13         enc string
  14         dec []byte
  15 }
  16
  17 var encDecTests = []encDecTest{
  18         {"", []byte{}},
  19         {"0001020304050607", []byte{0, 1, 2, 3, 4, 5, 6, 7}},
  20         {"08090a0b0c0d0e0f", []byte{8, 9, 10, 11, 12, 13, 14, 15}},
  21         {"f0f1f2f3f4f5f6f7", []byte{0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7}},
  22         {"f8f9fafbfcfdfeff", []byte{0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}},
  23         {"67", []byte{'g'}},
  24         {"e3a1", []byte{0xe3, 0xa1}},
  25 }
  26
  27 func TestEncode(t *testing.T) {
  28         for i, test := range encDecTests {
  29                 dst := make([]byte, EncodedLen(len(test.dec)))
  30                 n := Encode(dst, test.dec)
  31                 if n != len(dst) {
  32                         t.Errorf("#%d: bad return value: got: %d want: %d", i, n, len(dst))
  33                 }
  34                 if string(dst) != test.enc {
  35                         t.Errorf("#%d: got: %#v want: %#v", i, dst, test.enc)
  36                 }
  37         }
  38 }
  39
  40 func TestDecode(t *testing.T) {
  41         // Case for decoding uppercase hex characters, since
  42         // Encode always uses lowercase.
  43         decTests := append(encDecTests, encDecTest{"F8F9FAFBFCFDFEFF", []byte{0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}})
  44         for i, test := range decTests {
  45                 dst := make([]byte, DecodedLen(len(test.enc)))
  46                 n, err := Decode(dst, []byte(test.enc))
  47                 if err != nil {
  48                         t.Errorf("#%d: bad return value: got:%d want:%d", i, n, len(dst))
  49                 } else if !bytes.Equal(dst, test.dec) {
  50                         t.Errorf("#%d: got: %#v want: %#v", i, dst, test.dec)
  51                 }
  52         }
  53 }
  54
  55 func TestEncodeToString(t *testing.T) {
  56         for i, test := range encDecTests {
  57                 s := EncodeToString(test.dec)
  58                 if s != test.enc {
  59                         t.Errorf("#%d got:%s want:%s", i, s, test.enc)
  60                 }
  61         }
  62 }
  63
  64 func TestDecodeString(t *testing.T) {
  65         for i, test := range encDecTests {
  66                 dst, err := DecodeString(test.enc)
  67                 if err != nil {
  68                         t.Errorf("#%d: unexpected err value: %s", i, err)
  69                         continue
  70                 }
  71                 if !bytes.Equal(dst, test.dec) {
  72                         t.Errorf("#%d: got: %#v want: #%v", i, dst, test.dec)
  73                 }
  74         }
  75 }
  76
  77 type errTest struct {
  78         in  string
  79         err string
  80 }
  81
  82 var errTests = []errTest{
  83         {"0", "encoding/hex: odd length hex string"},
  84         {"0g", "encoding/hex: invalid byte: U+0067 'g'"},
  85         {"00gg", "encoding/hex: invalid byte: U+0067 'g'"},
  86         {"0\x01", "encoding/hex: invalid byte: U+0001"},
  87 }
  88
  89 func TestInvalidErr(t *testing.T) {
  90         for i, test := range errTests {
  91                 dst := make([]byte, DecodedLen(len(test.in)))
  92                 _, err := Decode(dst, []byte(test.in))
  93                 if err == nil {
  94                         t.Errorf("#%d: expected error; got none", i)
  95                 } else if err.Error() != test.err {
  96                         t.Errorf("#%d: got: %v want: %v", i, err, test.err)
  97                 }
  98         }
  99 }
 100
 101 func TestInvalidStringErr(t *testing.T) {
 102         for i, test := range errTests {
 103                 _, err := DecodeString(test.in)
 104                 if err == nil {
 105                         t.Errorf("#%d: expected error; got none", i)
 106                 } else if err.Error() != test.err {
 107                         t.Errorf("#%d: got: %v want: %v", i, err, test.err)
 108                 }
 109         }
 110 }
 111
 112 func TestDumper(t *testing.T) {
 113         var in [40]byte
 114         for i := range in {
 115                 in[i] = byte(i + 30)
 116         }
 117
 118         for stride := 1; stride < len(in); stride++ {
 119                 var out bytes.Buffer
 120                 dumper := Dumper(&out)
 121                 done := 0
 122                 for done < len(in) {
 123                         todo := done + stride
 124                         if todo > len(in) {
 125                                 todo = len(in)
 126                         }
 127                         dumper.Write(in[done:todo])
 128                         done = todo
 129                 }
 130
 131                 dumper.Close()
 132                 if !bytes.Equal(out.Bytes(), expectedHexDump) {
 133                         t.Errorf("stride: %d failed. got:\n%s\nwant:\n%s", stride, out.Bytes(), expectedHexDump)
 134                 }
 135         }
 136 }
 137
 138 func TestDump(t *testing.T) {
 139         var in [40]byte
 140         for i := range in {
 141                 in[i] = byte(i + 30)
 142         }
 143
 144         out := []byte(Dump(in[:]))
 145         if !bytes.Equal(out, expectedHexDump) {
 146                 t.Errorf("got:\n%s\nwant:\n%s", out, expectedHexDump)
 147         }
 148 }
 149
 150 var expectedHexDump = []byte(`00000000  1e 1f 20 21 22 23 24 25  26 27 28 29 2a 2b 2c 2d  |.. !"#$%&'()*+,-|
 151 00000010  2e 2f 30 31 32 33 34 35  36 37 38 39 3a 3b 3c 3d  |./0123456789:;<=|
 152 00000020  3e 3f 40 41 42 43 44 45                           |>?@ABCDE|
 153 `)