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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package git85
import (
"bytes"
"io/ioutil"
"os"
"testing"
)
type testpair struct {
decoded, encoded string
}
func testEqual(t *testing.T, msg string, args ...interface{}) bool {
if args[len(args)-2] != args[len(args)-1] {
t.Errorf(msg, args...)
return false
}
return true
}
func TestGitTable(t *testing.T) {
var saw [256]bool
for i, c := range encode {
if decode[c] != uint8(i+1) {
t.Errorf("decode['%c'] = %d, want %d", c, decode[c], i+1)
}
saw[c] = true
}
for i, b := range saw {
if !b && decode[i] != 0 {
t.Errorf("decode[%d] = %d, want 0", i, decode[i])
}
}
}
var gitPairs = []testpair{
// Wikipedia example, adapted.
{
"Man is distinguished, not only by his reason, but by this singular passion from " +
"other animals, which is a lust of the mind, that by a perseverance of delight in " +
"the continued and indefatigable generation of knowledge, exceeds the short " +
"vehemence of any carnal pleasure.",
"zO<`^zX>%ZCX>)XGZfA9Ab7*B`EFf-gbRchTY<VDJc_3(Mb0BhMVRLV8EFfZabRc4R\n" +
"zAarPHb0BkRZfA9DVR9gFVRLh7Z*CxFa&K)QZ**v7av))DX>DO_b1WctXlY|;AZc?T\n" +
"zVIXXEb95kYW*~HEWgu;7Ze%PVbZB98AYyqSVIXj2a&u*NWpZI|V`U(3W*}r`Y-wj`\n" +
"zbRcPNAarPDAY*TCbZKsNWn>^>Ze$>7Ze(R<VRUI{VPb4$AZKN6WpZJ3X>V>IZ)PBC\n" +
"zZf|#NWn^b%EFfigV`XJzb0BnRWgv5CZ*p`Xc4cT~ZDnp_Wgu^6AYpEKAY);2ZeeU7\n" +
"IaBO8^b9HiME&u=k\n",
},
}
var gitBigtest = gitPairs[len(gitPairs)-1]
func TestEncode(t *testing.T) {
for _, p := range gitPairs {
buf := make([]byte, EncodedLen(len(p.decoded)))
n := Encode(buf, []byte(p.decoded))
if n != len(buf) {
t.Errorf("EncodedLen does not agree with Encode")
}
buf = buf[0:n]
testEqual(t, "Encode(%q) = %q, want %q", p.decoded, string(buf), p.encoded)
}
}
func TestEncoder(t *testing.T) {
for _, p := range gitPairs {
bb := &bytes.Buffer{}
encoder := NewEncoder(bb)
encoder.Write([]byte(p.decoded))
encoder.Close()
testEqual(t, "Encode(%q) = %q, want %q", p.decoded, bb.String(), p.encoded)
}
}
func TestEncoderBuffering(t *testing.T) {
input := []byte(gitBigtest.decoded)
for bs := 1; bs <= 12; bs++ {
bb := &bytes.Buffer{}
encoder := NewEncoder(bb)
for pos := 0; pos < len(input); pos += bs {
end := pos + bs
if end > len(input) {
end = len(input)
}
n, err := encoder.Write(input[pos:end])
testEqual(t, "Write(%q) gave error %v, want %v", input[pos:end], err, os.Error(nil))
testEqual(t, "Write(%q) gave length %v, want %v", input[pos:end], n, end-pos)
}
err := encoder.Close()
testEqual(t, "Close gave error %v, want %v", err, os.Error(nil))
testEqual(t, "Encoding/%d of %q = %q, want %q", bs, gitBigtest.decoded, bb.String(), gitBigtest.encoded)
}
}
func TestDecode(t *testing.T) {
for _, p := range gitPairs {
dbuf := make([]byte, 4*len(p.encoded))
ndst, err := Decode(dbuf, []byte(p.encoded))
testEqual(t, "Decode(%q) = error %v, want %v", p.encoded, err, os.Error(nil))
testEqual(t, "Decode(%q) = ndst %v, want %v", p.encoded, ndst, len(p.decoded))
testEqual(t, "Decode(%q) = %q, want %q", p.encoded, string(dbuf[0:ndst]), p.decoded)
}
}
func TestDecoder(t *testing.T) {
for _, p := range gitPairs {
decoder := NewDecoder(bytes.NewBufferString(p.encoded))
dbuf, err := ioutil.ReadAll(decoder)
if err != nil {
t.Fatal("Read failed", err)
}
testEqual(t, "Read from %q = length %v, want %v", p.encoded, len(dbuf), len(p.decoded))
testEqual(t, "Decoding of %q = %q, want %q", p.encoded, string(dbuf), p.decoded)
if err != nil {
testEqual(t, "Read from %q = %v, want %v", p.encoded, err, os.EOF)
}
}
}
func TestDecoderBuffering(t *testing.T) {
for bs := 1; bs <= 12; bs++ {
decoder := NewDecoder(bytes.NewBufferString(gitBigtest.encoded))
buf := make([]byte, len(gitBigtest.decoded)+12)
var total int
for total = 0; total < len(gitBigtest.decoded); {
n, err := decoder.Read(buf[total : total+bs])
testEqual(t, "Read from %q at pos %d = %d, %v, want _, %v", gitBigtest.encoded, total, n, err, os.Error(nil))
total += n
}
testEqual(t, "Decoding/%d of %q = %q, want %q", bs, gitBigtest.encoded, string(buf[0:total]), gitBigtest.decoded)
}
}
func TestDecodeCorrupt(t *testing.T) {
type corrupt struct {
e string
p int
}
examples := []corrupt{
{"v", 0},
{"!z!!!!!!!!!", 0},
}
for _, e := range examples {
dbuf := make([]byte, 2*len(e.e))
_, err := Decode(dbuf, []byte(e.e))
switch err := err.(type) {
case CorruptInputError:
testEqual(t, "Corruption in %q at offset %v, want %v", e.e, int(err), e.p)
default:
t.Error("Decoder failed to detect corruption in", e)
}
}
}
func TestGitBig(t *testing.T) {
n := 3*1000 + 1
raw := make([]byte, n)
const alpha = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
for i := 0; i < n; i++ {
raw[i] = alpha[i%len(alpha)]
}
encoded := new(bytes.Buffer)
w := NewEncoder(encoded)
nn, err := w.Write(raw)
if nn != n || err != nil {
t.Fatalf("Encoder.Write(raw) = %d, %v want %d, nil", nn, err, n)
}
err = w.Close()
if err != nil {
t.Fatalf("Encoder.Close() = %v want nil", err)
}
decoded, err := ioutil.ReadAll(NewDecoder(encoded))
if err != nil {
t.Fatalf("ioutil.ReadAll(NewDecoder(...)): %v", err)
}
if !bytes.Equal(raw, decoded) {
var i int
for i = 0; i < len(decoded) && i < len(raw); i++ {
if decoded[i] != raw[i] {
break
}
}
t.Errorf("Decode(Encode(%d-byte string)) failed at offset %d", n, i)
}
}
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