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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 bytes_test
import (
. "bytes"
"fmt"
"internal/testenv"
"math"
"math/rand"
"reflect"
"strings"
"testing"
"unicode"
"unicode/utf8"
)
func eq(a, b []string) bool {
if len(a) != len(b) {
return false
}
for i := 0; i < len(a); i++ {
if a[i] != b[i] {
return false
}
}
return true
}
func sliceOfString(s [][]byte) []string {
result := make([]string, len(s))
for i, v := range s {
result[i] = string(v)
}
return result
}
// For ease of reading, the test cases use strings that are converted to byte
// slices before invoking the functions.
var abcd = "abcd"
var faces = "☺☻☹"
var commas = "1,2,3,4"
var dots = "1....2....3....4"
type BinOpTest struct {
a string
b string
i int
}
func TestEqual(t *testing.T) {
// Run the tests and check for allocation at the same time.
allocs := testing.AllocsPerRun(10, func() {
for _, tt := range compareTests {
eql := Equal(tt.a, tt.b)
if eql != (tt.i == 0) {
t.Errorf(`Equal(%q, %q) = %v`, tt.a, tt.b, eql)
}
}
})
if allocs > 0 {
t.Errorf("Equal allocated %v times", allocs)
}
}
func TestEqualExhaustive(t *testing.T) {
var size = 128
if testing.Short() {
size = 32
}
a := make([]byte, size)
b := make([]byte, size)
b_init := make([]byte, size)
// randomish but deterministic data
for i := 0; i < size; i++ {
a[i] = byte(17 * i)
b_init[i] = byte(23*i + 100)
}
for len := 0; len <= size; len++ {
for x := 0; x <= size-len; x++ {
for y := 0; y <= size-len; y++ {
copy(b, b_init)
copy(b[y:y+len], a[x:x+len])
if !Equal(a[x:x+len], b[y:y+len]) || !Equal(b[y:y+len], a[x:x+len]) {
t.Errorf("Equal(%d, %d, %d) = false", len, x, y)
}
}
}
}
}
// make sure Equal returns false for minimally different strings. The data
// is all zeros except for a single one in one location.
func TestNotEqual(t *testing.T) {
var size = 128
if testing.Short() {
size = 32
}
a := make([]byte, size)
b := make([]byte, size)
for len := 0; len <= size; len++ {
for x := 0; x <= size-len; x++ {
for y := 0; y <= size-len; y++ {
for diffpos := x; diffpos < x+len; diffpos++ {
a[diffpos] = 1
if Equal(a[x:x+len], b[y:y+len]) || Equal(b[y:y+len], a[x:x+len]) {
t.Errorf("NotEqual(%d, %d, %d, %d) = true", len, x, y, diffpos)
}
a[diffpos] = 0
}
}
}
}
}
var indexTests = []BinOpTest{
{"", "", 0},
{"", "a", -1},
{"", "foo", -1},
{"fo", "foo", -1},
{"foo", "baz", -1},
{"foo", "foo", 0},
{"oofofoofooo", "f", 2},
{"oofofoofooo", "foo", 4},
{"barfoobarfoo", "foo", 3},
{"foo", "", 0},
{"foo", "o", 1},
{"abcABCabc", "A", 3},
// cases with one byte strings - test IndexByte and special case in Index()
{"", "a", -1},
{"x", "a", -1},
{"x", "x", 0},
{"abc", "a", 0},
{"abc", "b", 1},
{"abc", "c", 2},
{"abc", "x", -1},
{"barfoobarfooyyyzzzyyyzzzyyyzzzyyyxxxzzzyyy", "x", 33},
{"foofyfoobarfoobar", "y", 4},
{"oooooooooooooooooooooo", "r", -1},
{"oxoxoxoxoxoxoxoxoxoxoxoy", "oy", 22},
{"oxoxoxoxoxoxoxoxoxoxoxox", "oy", -1},
// test fallback to Rabin-Karp.
{"000000000000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000000001", 5},
}
var lastIndexTests = []BinOpTest{
{"", "", 0},
{"", "a", -1},
{"", "foo", -1},
{"fo", "foo", -1},
{"foo", "foo", 0},
{"foo", "f", 0},
{"oofofoofooo", "f", 7},
{"oofofoofooo", "foo", 7},
{"barfoobarfoo", "foo", 9},
{"foo", "", 3},
{"foo", "o", 2},
{"abcABCabc", "A", 3},
{"abcABCabc", "a", 6},
}
var indexAnyTests = []BinOpTest{
{"", "", -1},
{"", "a", -1},
{"", "abc", -1},
{"a", "", -1},
{"a", "a", 0},
{"\x80", "\xffb", 0},
{"aaa", "a", 0},
{"abc", "xyz", -1},
{"abc", "xcz", 2},
{"ab☺c", "x☺yz", 2},
{"a☺b☻c☹d", "cx", len("a☺b☻")},
{"a☺b☻c☹d", "uvw☻xyz", len("a☺b")},
{"aRegExp*", ".(|)*+?^$[]", 7},
{dots + dots + dots, " ", -1},
{"012abcba210", "\xffb", 4},
{"012\x80bcb\x80210", "\xffb", 3},
{"0123456\xcf\x80abc", "\xcfb\x80", 10},
}
var lastIndexAnyTests = []BinOpTest{
{"", "", -1},
{"", "a", -1},
{"", "abc", -1},
{"a", "", -1},
{"a", "a", 0},
{"\x80", "\xffb", 0},
{"aaa", "a", 2},
{"abc", "xyz", -1},
{"abc", "ab", 1},
{"ab☺c", "x☺yz", 2},
{"a☺b☻c☹d", "cx", len("a☺b☻")},
{"a☺b☻c☹d", "uvw☻xyz", len("a☺b")},
{"a.RegExp*", ".(|)*+?^$[]", 8},
{dots + dots + dots, " ", -1},
{"012abcba210", "\xffb", 6},
{"012\x80bcb\x80210", "\xffb", 7},
{"0123456\xcf\x80abc", "\xcfb\x80", 10},
}
// Execute f on each test case. funcName should be the name of f; it's used
// in failure reports.
func runIndexTests(t *testing.T, f func(s, sep []byte) int, funcName string, testCases []BinOpTest) {
for _, test := range testCases {
a := []byte(test.a)
b := []byte(test.b)
actual := f(a, b)
if actual != test.i {
t.Errorf("%s(%q,%q) = %v; want %v", funcName, a, b, actual, test.i)
}
}
var allocTests = []struct {
a []byte
b []byte
i int
}{
// case for function Index.
{[]byte("000000000000000000000000000000000000000000000000000000000000000000000001"), []byte("0000000000000000000000000000000000000000000000000000000000000000001"), 5},
// case for function LastIndex.
{[]byte("000000000000000000000000000000000000000000000000000000000000000010000"), []byte("00000000000000000000000000000000000000000000000000000000000001"), 3},
}
allocs := testing.AllocsPerRun(100, func() {
if i := Index(allocTests[1].a, allocTests[1].b); i != allocTests[1].i {
t.Errorf("Index([]byte(%q), []byte(%q)) = %v; want %v", allocTests[1].a, allocTests[1].b, i, allocTests[1].i)
}
if i := LastIndex(allocTests[0].a, allocTests[0].b); i != allocTests[0].i {
t.Errorf("LastIndex([]byte(%q), []byte(%q)) = %v; want %v", allocTests[0].a, allocTests[0].b, i, allocTests[0].i)
}
})
if allocs != 0 {
t.Errorf("expected no allocations, got %f", allocs)
}
}
func runIndexAnyTests(t *testing.T, f func(s []byte, chars string) int, funcName string, testCases []BinOpTest) {
for _, test := range testCases {
a := []byte(test.a)
actual := f(a, test.b)
if actual != test.i {
t.Errorf("%s(%q,%q) = %v; want %v", funcName, a, test.b, actual, test.i)
}
}
}
func TestIndex(t *testing.T) { runIndexTests(t, Index, "Index", indexTests) }
func TestLastIndex(t *testing.T) { runIndexTests(t, LastIndex, "LastIndex", lastIndexTests) }
func TestIndexAny(t *testing.T) { runIndexAnyTests(t, IndexAny, "IndexAny", indexAnyTests) }
func TestLastIndexAny(t *testing.T) {
runIndexAnyTests(t, LastIndexAny, "LastIndexAny", lastIndexAnyTests)
}
func TestIndexByte(t *testing.T) {
for _, tt := range indexTests {
if len(tt.b) != 1 {
continue
}
a := []byte(tt.a)
b := tt.b[0]
pos := IndexByte(a, b)
if pos != tt.i {
t.Errorf(`IndexByte(%q, '%c') = %v`, tt.a, b, pos)
}
posp := IndexBytePortable(a, b)
if posp != tt.i {
t.Errorf(`indexBytePortable(%q, '%c') = %v`, tt.a, b, posp)
}
}
}
func TestLastIndexByte(t *testing.T) {
testCases := []BinOpTest{
{"", "q", -1},
{"abcdef", "q", -1},
{"abcdefabcdef", "a", len("abcdef")}, // something in the middle
{"abcdefabcdef", "f", len("abcdefabcde")}, // last byte
{"zabcdefabcdef", "z", 0}, // first byte
{"a☺b☻c☹d", "b", len("a☺")}, // non-ascii
}
for _, test := range testCases {
actual := LastIndexByte([]byte(test.a), test.b[0])
if actual != test.i {
t.Errorf("LastIndexByte(%q,%c) = %v; want %v", test.a, test.b[0], actual, test.i)
}
}
}
// test a larger buffer with different sizes and alignments
func TestIndexByteBig(t *testing.T) {
var n = 1024
if testing.Short() {
n = 128
}
b := make([]byte, n)
for i := 0; i < n; i++ {
// different start alignments
b1 := b[i:]
for j := 0; j < len(b1); j++ {
b1[j] = 'x'
pos := IndexByte(b1, 'x')
if pos != j {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
b1[j] = 0
pos = IndexByte(b1, 'x')
if pos != -1 {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
}
// different end alignments
b1 = b[:i]
for j := 0; j < len(b1); j++ {
b1[j] = 'x'
pos := IndexByte(b1, 'x')
if pos != j {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
b1[j] = 0
pos = IndexByte(b1, 'x')
if pos != -1 {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
}
// different start and end alignments
b1 = b[i/2 : n-(i+1)/2]
for j := 0; j < len(b1); j++ {
b1[j] = 'x'
pos := IndexByte(b1, 'x')
if pos != j {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
b1[j] = 0
pos = IndexByte(b1, 'x')
if pos != -1 {
t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
}
}
}
}
// test a small index across all page offsets
func TestIndexByteSmall(t *testing.T) {
b := make([]byte, 5015) // bigger than a page
// Make sure we find the correct byte even when straddling a page.
for i := 0; i <= len(b)-15; i++ {
for j := 0; j < 15; j++ {
b[i+j] = byte(100 + j)
}
for j := 0; j < 15; j++ {
p := IndexByte(b[i:i+15], byte(100+j))
if p != j {
t.Errorf("IndexByte(%q, %d) = %d", b[i:i+15], 100+j, p)
}
}
for j := 0; j < 15; j++ {
b[i+j] = 0
}
}
// Make sure matches outside the slice never trigger.
for i := 0; i <= len(b)-15; i++ {
for j := 0; j < 15; j++ {
b[i+j] = 1
}
for j := 0; j < 15; j++ {
p := IndexByte(b[i:i+15], byte(0))
if p != -1 {
t.Errorf("IndexByte(%q, %d) = %d", b[i:i+15], 0, p)
}
}
for j := 0; j < 15; j++ {
b[i+j] = 0
}
}
}
func TestIndexRune(t *testing.T) {
tests := []struct {
in string
rune rune
want int
}{
{"", 'a', -1},
{"", '☺', -1},
{"foo", '☹', -1},
{"foo", 'o', 1},
{"foo☺bar", '☺', 3},
{"foo☺☻☹bar", '☹', 9},
{"a A x", 'A', 2},
{"some_text=some_value", '=', 9},
{"☺a", 'a', 3},
{"a☻☺b", '☺', 4},
// RuneError should match any invalid UTF-8 byte sequence.
{"�", '�', 0},
{"\xff", '�', 0},
{"☻x�", '�', len("☻x")},
{"☻x\xe2\x98", '�', len("☻x")},
{"☻x\xe2\x98�", '�', len("☻x")},
{"☻x\xe2\x98x", '�', len("☻x")},
// Invalid rune values should never match.
{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", -1, -1},
{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", 0xD800, -1}, // Surrogate pair
{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", utf8.MaxRune + 1, -1},
}
for _, tt := range tests {
if got := IndexRune([]byte(tt.in), tt.rune); got != tt.want {
t.Errorf("IndexRune(%q, %d) = %v; want %v", tt.in, tt.rune, got, tt.want)
}
}
haystack := []byte("test世界")
allocs := testing.AllocsPerRun(1000, func() {
if i := IndexRune(haystack, 's'); i != 2 {
t.Fatalf("'s' at %d; want 2", i)
}
if i := IndexRune(haystack, '世'); i != 4 {
t.Fatalf("'世' at %d; want 4", i)
}
})
if allocs != 0 {
t.Errorf("expected no allocations, got %f", allocs)
}
}
// test count of a single byte across page offsets
func TestCountByte(t *testing.T) {
b := make([]byte, 5015) // bigger than a page
windows := []int{1, 2, 3, 4, 15, 16, 17, 31, 32, 33, 63, 64, 65, 128}
testCountWindow := func(i, window int) {
for j := 0; j < window; j++ {
b[i+j] = byte(100)
p := Count(b[i:i+window], []byte{100})
if p != j+1 {
t.Errorf("TestCountByte.Count(%q, 100) = %d", b[i:i+window], p)
}
}
}
maxWnd := windows[len(windows)-1]
for i := 0; i <= 2*maxWnd; i++ {
for _, window := range windows {
if window > len(b[i:]) {
window = len(b[i:])
}
testCountWindow(i, window)
for j := 0; j < window; j++ {
b[i+j] = byte(0)
}
}
}
for i := 4096 - (maxWnd + 1); i < len(b); i++ {
for _, window := range windows {
if window > len(b[i:]) {
window = len(b[i:])
}
testCountWindow(i, window)
for j := 0; j < window; j++ {
b[i+j] = byte(0)
}
}
}
}
// Make sure we don't count bytes outside our window
func TestCountByteNoMatch(t *testing.T) {
b := make([]byte, 5015)
windows := []int{1, 2, 3, 4, 15, 16, 17, 31, 32, 33, 63, 64, 65, 128}
for i := 0; i <= len(b); i++ {
for _, window := range windows {
if window > len(b[i:]) {
window = len(b[i:])
}
// Fill the window with non-match
for j := 0; j < window; j++ {
b[i+j] = byte(100)
}
// Try to find something that doesn't exist
p := Count(b[i:i+window], []byte{0})
if p != 0 {
t.Errorf("TestCountByteNoMatch(%q, 0) = %d", b[i:i+window], p)
}
for j := 0; j < window; j++ {
b[i+j] = byte(0)
}
}
}
}
var bmbuf []byte
func valName(x int) string {
if s := x >> 20; s<<20 == x {
return fmt.Sprintf("%dM", s)
}
if s := x >> 10; s<<10 == x {
return fmt.Sprintf("%dK", s)
}
return fmt.Sprint(x)
}
func benchBytes(b *testing.B, sizes []int, f func(b *testing.B, n int)) {
for _, n := range sizes {
if isRaceBuilder && n > 4<<10 {
continue
}
b.Run(valName(n), func(b *testing.B) {
if len(bmbuf) < n {
bmbuf = make([]byte, n)
}
b.SetBytes(int64(n))
f(b, n)
})
}
}
var indexSizes = []int{10, 32, 4 << 10, 4 << 20, 64 << 20}
var isRaceBuilder = strings.HasSuffix(testenv.Builder(), "-race")
func BenchmarkIndexByte(b *testing.B) {
benchBytes(b, indexSizes, bmIndexByte(IndexByte))
}
func BenchmarkIndexBytePortable(b *testing.B) {
benchBytes(b, indexSizes, bmIndexByte(IndexBytePortable))
}
func bmIndexByte(index func([]byte, byte) int) func(b *testing.B, n int) {
return func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
for i := 0; i < b.N; i++ {
j := index(buf, 'x')
if j != n-1 {
b.Fatal("bad index", j)
}
}
buf[n-1] = '\x00'
}
}
func BenchmarkIndexRune(b *testing.B) {
benchBytes(b, indexSizes, bmIndexRune(IndexRune))
}
func BenchmarkIndexRuneASCII(b *testing.B) {
benchBytes(b, indexSizes, bmIndexRuneASCII(IndexRune))
}
func bmIndexRuneASCII(index func([]byte, rune) int) func(b *testing.B, n int) {
return func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
for i := 0; i < b.N; i++ {
j := index(buf, 'x')
if j != n-1 {
b.Fatal("bad index", j)
}
}
buf[n-1] = '\x00'
}
}
func bmIndexRune(index func([]byte, rune) int) func(b *testing.B, n int) {
return func(b *testing.B, n int) {
buf := bmbuf[0:n]
utf8.EncodeRune(buf[n-3:], '世')
for i := 0; i < b.N; i++ {
j := index(buf, '世')
if j != n-3 {
b.Fatal("bad index", j)
}
}
buf[n-3] = '\x00'
buf[n-2] = '\x00'
buf[n-1] = '\x00'
}
}
func BenchmarkEqual(b *testing.B) {
b.Run("0", func(b *testing.B) {
var buf [4]byte
buf1 := buf[0:0]
buf2 := buf[1:1]
for i := 0; i < b.N; i++ {
eq := Equal(buf1, buf2)
if !eq {
b.Fatal("bad equal")
}
}
})
sizes := []int{1, 6, 9, 15, 16, 20, 32, 4 << 10, 4 << 20, 64 << 20}
benchBytes(b, sizes, bmEqual(Equal))
}
func bmEqual(equal func([]byte, []byte) bool) func(b *testing.B, n int) {
return func(b *testing.B, n int) {
if len(bmbuf) < 2*n {
bmbuf = make([]byte, 2*n)
}
buf1 := bmbuf[0:n]
buf2 := bmbuf[n : 2*n]
buf1[n-1] = 'x'
buf2[n-1] = 'x'
for i := 0; i < b.N; i++ {
eq := equal(buf1, buf2)
if !eq {
b.Fatal("bad equal")
}
}
buf1[n-1] = '\x00'
buf2[n-1] = '\x00'
}
}
func BenchmarkIndex(b *testing.B) {
benchBytes(b, indexSizes, func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
for i := 0; i < b.N; i++ {
j := Index(buf, buf[n-7:])
if j != n-7 {
b.Fatal("bad index", j)
}
}
buf[n-1] = '\x00'
})
}
func BenchmarkIndexEasy(b *testing.B) {
benchBytes(b, indexSizes, func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
buf[n-7] = 'x'
for i := 0; i < b.N; i++ {
j := Index(buf, buf[n-7:])
if j != n-7 {
b.Fatal("bad index", j)
}
}
buf[n-1] = '\x00'
buf[n-7] = '\x00'
})
}
func BenchmarkCount(b *testing.B) {
benchBytes(b, indexSizes, func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
for i := 0; i < b.N; i++ {
j := Count(buf, buf[n-7:])
if j != 1 {
b.Fatal("bad count", j)
}
}
buf[n-1] = '\x00'
})
}
func BenchmarkCountEasy(b *testing.B) {
benchBytes(b, indexSizes, func(b *testing.B, n int) {
buf := bmbuf[0:n]
buf[n-1] = 'x'
buf[n-7] = 'x'
for i := 0; i < b.N; i++ {
j := Count(buf, buf[n-7:])
if j != 1 {
b.Fatal("bad count", j)
}
}
buf[n-1] = '\x00'
buf[n-7] = '\x00'
})
}
func BenchmarkCountSingle(b *testing.B) {
benchBytes(b, indexSizes, func(b *testing.B, n int) {
buf := bmbuf[0:n]
step := 8
for i := 0; i < len(buf); i += step {
buf[i] = 1
}
expect := (len(buf) + (step - 1)) / step
for i := 0; i < b.N; i++ {
j := Count(buf, []byte{1})
if j != expect {
b.Fatal("bad count", j, expect)
}
}
for i := 0; i < len(buf); i++ {
buf[i] = 0
}
})
}
type SplitTest struct {
s string
sep string
n int
a []string
}
var splittests = []SplitTest{
{"", "", -1, []string{}},
{abcd, "a", 0, nil},
{abcd, "", 2, []string{"a", "bcd"}},
{abcd, "a", -1, []string{"", "bcd"}},
{abcd, "z", -1, []string{"abcd"}},
{abcd, "", -1, []string{"a", "b", "c", "d"}},
{commas, ",", -1, []string{"1", "2", "3", "4"}},
{dots, "...", -1, []string{"1", ".2", ".3", ".4"}},
{faces, "☹", -1, []string{"☺☻", ""}},
{faces, "~", -1, []string{faces}},
{faces, "", -1, []string{"☺", "☻", "☹"}},
{"1 2 3 4", " ", 3, []string{"1", "2", "3 4"}},
{"1 2", " ", 3, []string{"1", "2"}},
{"123", "", 2, []string{"1", "23"}},
{"123", "", 17, []string{"1", "2", "3"}},
{"bT", "T", math.MaxInt / 4, []string{"b", ""}},
}
func TestSplit(t *testing.T) {
for _, tt := range splittests {
a := SplitN([]byte(tt.s), []byte(tt.sep), tt.n)
// Appending to the results should not change future results.
var x []byte
for _, v := range a {
x = append(v, 'z')
}
result := sliceOfString(a)
if !eq(result, tt.a) {
t.Errorf(`Split(%q, %q, %d) = %v; want %v`, tt.s, tt.sep, tt.n, result, tt.a)
continue
}
if tt.n == 0 || len(a) == 0 {
continue
}
if want := tt.a[len(tt.a)-1] + "z"; string(x) != want {
t.Errorf("last appended result was %s; want %s", x, want)
}
s := Join(a, []byte(tt.sep))
if string(s) != tt.s {
t.Errorf(`Join(Split(%q, %q, %d), %q) = %q`, tt.s, tt.sep, tt.n, tt.sep, s)
}
if tt.n < 0 {
b := Split([]byte(tt.s), []byte(tt.sep))
if !reflect.DeepEqual(a, b) {
t.Errorf("Split disagrees withSplitN(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, b, a)
}
}
if len(a) > 0 {
in, out := a[0], s
if cap(in) == cap(out) && &in[:1][0] == &out[:1][0] {
t.Errorf("Join(%#v, %q) didn't copy", a, tt.sep)
}
}
}
}
var splitaftertests = []SplitTest{
{abcd, "a", -1, []string{"a", "bcd"}},
{abcd, "z", -1, []string{"abcd"}},
{abcd, "", -1, []string{"a", "b", "c", "d"}},
{commas, ",", -1, []string{"1,", "2,", "3,", "4"}},
{dots, "...", -1, []string{"1...", ".2...", ".3...", ".4"}},
{faces, "☹", -1, []string{"☺☻☹", ""}},
{faces, "~", -1, []string{faces}},
{faces, "", -1, []string{"☺", "☻", "☹"}},
{"1 2 3 4", " ", 3, []string{"1 ", "2 ", "3 4"}},
{"1 2 3", " ", 3, []string{"1 ", "2 ", "3"}},
{"1 2", " ", 3, []string{"1 ", "2"}},
{"123", "", 2, []string{"1", "23"}},
{"123", "", 17, []string{"1", "2", "3"}},
}
func TestSplitAfter(t *testing.T) {
for _, tt := range splitaftertests {
a := SplitAfterN([]byte(tt.s), []byte(tt.sep), tt.n)
// Appending to the results should not change future results.
var x []byte
for _, v := range a {
x = append(v, 'z')
}
result := sliceOfString(a)
if !eq(result, tt.a) {
t.Errorf(`Split(%q, %q, %d) = %v; want %v`, tt.s, tt.sep, tt.n, result, tt.a)
continue
}
if want := tt.a[len(tt.a)-1] + "z"; string(x) != want {
t.Errorf("last appended result was %s; want %s", x, want)
}
s := Join(a, nil)
if string(s) != tt.s {
t.Errorf(`Join(Split(%q, %q, %d), %q) = %q`, tt.s, tt.sep, tt.n, tt.sep, s)
}
if tt.n < 0 {
b := SplitAfter([]byte(tt.s), []byte(tt.sep))
if !reflect.DeepEqual(a, b) {
t.Errorf("SplitAfter disagrees withSplitAfterN(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, b, a)
}
}
}
}
type FieldsTest struct {
s string
a []string
}
var fieldstests = []FieldsTest{
{"", []string{}},
{" ", []string{}},
{" \t ", []string{}},
{" abc ", []string{"abc"}},
{"1 2 3 4", []string{"1", "2", "3", "4"}},
{"1 2 3 4", []string{"1", "2", "3", "4"}},
{"1\t\t2\t\t3\t4", []string{"1", "2", "3", "4"}},
{"1\u20002\u20013\u20024", []string{"1", "2", "3", "4"}},
{"\u2000\u2001\u2002", []string{}},
{"\n™\t™\n", []string{"™", "™"}},
{faces, []string{faces}},
}
func TestFields(t *testing.T) {
for _, tt := range fieldstests {
b := []byte(tt.s)
a := Fields(b)
// Appending to the results should not change future results.
var x []byte
for _, v := range a {
x = append(v, 'z')
}
result := sliceOfString(a)
if !eq(result, tt.a) {
t.Errorf("Fields(%q) = %v; want %v", tt.s, a, tt.a)
continue
}
if string(b) != tt.s {
t.Errorf("slice changed to %s; want %s", string(b), tt.s)
}
if len(tt.a) > 0 {
if want := tt.a[len(tt.a)-1] + "z"; string(x) != want {
t.Errorf("last appended result was %s; want %s", x, want)
}
}
}
}
func TestFieldsFunc(t *testing.T) {
for _, tt := range fieldstests {
a := FieldsFunc([]byte(tt.s), unicode.IsSpace)
result := sliceOfString(a)
if !eq(result, tt.a) {
t.Errorf("FieldsFunc(%q, unicode.IsSpace) = %v; want %v", tt.s, a, tt.a)
continue
}
}
pred := func(c rune) bool { return c == 'X' }
var fieldsFuncTests = []FieldsTest{
{"", []string{}},
{"XX", []string{}},
{"XXhiXXX", []string{"hi"}},
{"aXXbXXXcX", []string{"a", "b", "c"}},
}
for _, tt := range fieldsFuncTests {
b := []byte(tt.s)
a := FieldsFunc(b, pred)
// Appending to the results should not change future results.
var x []byte
for _, v := range a {
x = append(v, 'z')
}
result := sliceOfString(a)
if !eq(result, tt.a) {
t.Errorf("FieldsFunc(%q) = %v, want %v", tt.s, a, tt.a)
}
if string(b) != tt.s {
t.Errorf("slice changed to %s; want %s", b, tt.s)
}
if len(tt.a) > 0 {
if want := tt.a[len(tt.a)-1] + "z"; string(x) != want {
t.Errorf("last appended result was %s; want %s", x, want)
}
}
}
}
// Test case for any function which accepts and returns a byte slice.
// For ease of creation, we write the input byte slice as a string.
type StringTest struct {
in string
out []byte
}
var upperTests = []StringTest{
{"", []byte("")},
{"ONLYUPPER", []byte("ONLYUPPER")},
{"abc", []byte("ABC")},
{"AbC123", []byte("ABC123")},
{"azAZ09_", []byte("AZAZ09_")},
{"longStrinGwitHmixofsmaLLandcAps", []byte("LONGSTRINGWITHMIXOFSMALLANDCAPS")},
{"long\u0250string\u0250with\u0250nonascii\u2C6Fchars", []byte("LONG\u2C6FSTRING\u2C6FWITH\u2C6FNONASCII\u2C6FCHARS")},
{"\u0250\u0250\u0250\u0250\u0250", []byte("\u2C6F\u2C6F\u2C6F\u2C6F\u2C6F")}, // grows one byte per char
{"a\u0080\U0010FFFF", []byte("A\u0080\U0010FFFF")}, // test utf8.RuneSelf and utf8.MaxRune
}
var lowerTests = []StringTest{
{"", []byte("")},
{"abc", []byte("abc")},
{"AbC123", []byte("abc123")},
{"azAZ09_", []byte("azaz09_")},
{"longStrinGwitHmixofsmaLLandcAps", []byte("longstringwithmixofsmallandcaps")},
{"LONG\u2C6FSTRING\u2C6FWITH\u2C6FNONASCII\u2C6FCHARS", []byte("long\u0250string\u0250with\u0250nonascii\u0250chars")},
{"\u2C6D\u2C6D\u2C6D\u2C6D\u2C6D", []byte("\u0251\u0251\u0251\u0251\u0251")}, // shrinks one byte per char
{"A\u0080\U0010FFFF", []byte("a\u0080\U0010FFFF")}, // test utf8.RuneSelf and utf8.MaxRune
}
const space = "\t\v\r\f\n\u0085\u00a0\u2000\u3000"
var trimSpaceTests = []StringTest{
{"", nil},
{" a", []byte("a")},
{"b ", []byte("b")},
{"abc", []byte("abc")},
{space + "abc" + space, []byte("abc")},
{" ", nil},
{"\u3000 ", nil},
{" \u3000", nil},
{" \t\r\n \t\t\r\r\n\n ", nil},
{" \t\r\n x\t\t\r\r\n\n ", []byte("x")},
{" \u2000\t\r\n x\t\t\r\r\ny\n \u3000", []byte("x\t\t\r\r\ny")},
{"1 \t\r\n2", []byte("1 \t\r\n2")},
{" x\x80", []byte("x\x80")},
{" x\xc0", []byte("x\xc0")},
{"x \xc0\xc0 ", []byte("x \xc0\xc0")},
{"x \xc0", []byte("x \xc0")},
{"x \xc0 ", []byte("x \xc0")},
{"x \xc0\xc0 ", []byte("x \xc0\xc0")},
{"x ☺\xc0\xc0 ", []byte("x ☺\xc0\xc0")},
{"x ☺ ", []byte("x ☺")},
}
// Execute f on each test case. funcName should be the name of f; it's used
// in failure reports.
func runStringTests(t *testing.T, f func([]byte) []byte, funcName string, testCases []StringTest) {
for _, tc := range testCases {
actual := f([]byte(tc.in))
if actual == nil && tc.out != nil {
t.Errorf("%s(%q) = nil; want %q", funcName, tc.in, tc.out)
}
if actual != nil && tc.out == nil {
t.Errorf("%s(%q) = %q; want nil", funcName, tc.in, actual)
}
if !Equal(actual, tc.out) {
t.Errorf("%s(%q) = %q; want %q", funcName, tc.in, actual, tc.out)
}
}
}
func tenRunes(r rune) string {
runes := make([]rune, 10)
for i := range runes {
runes[i] = r
}
return string(runes)
}
// User-defined self-inverse mapping function
func rot13(r rune) rune {
const step = 13
if r >= 'a' && r <= 'z' {
return ((r - 'a' + step) % 26) + 'a'
}
if r >= 'A' && r <= 'Z' {
return ((r - 'A' + step) % 26) + 'A'
}
return r
}