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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [bytes/] [bytes_test.go] - Blame information for rev 750

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Line No. Rev Author Line
1 747 jeremybenn 
// 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 bytes_test
6 
 
7 
import (
8 
        . "bytes"
9 
        "reflect"
10 
        "testing"
11 
        "unicode"
12 
        "unicode/utf8"
13 
)
14 
 
15 
func eq(a, b []string) bool {
16 
        if len(a) != len(b) {
17 
                return false
18 
        }
19 
        for i := 0; i < len(a); i++ {
20 
                if a[i] != b[i] {
21 
                        return false
22 
                }
23 
        }
24 
        return true
25 
}
26 
 
27 
func arrayOfString(a [][]byte) []string {
28 
        result := make([]string, len(a))
29 
        for j := 0; j < len(a); j++ {
30 
                result[j] = string(a[j])
31 
        }
32 
        return result
33 
}
34 
 
35 
// For ease of reading, the test cases use strings that are converted to byte
36 
// arrays before invoking the functions.
37 
 
38 
var abcd = "abcd"
39 
var faces = "☺☻☹"
40 
var commas = "1,2,3,4"
41 
var dots = "1....2....3....4"
42 
 
43 
type BinOpTest struct {
44 
        a string
45 
        b string
46 
        i int
47 
}
48 
 
49 
var comparetests = []BinOpTest{
50 
        {"", "", 0},
51 
        {"a", "", 1},
52 
        {"", "a", -1},
53 
        {"abc", "abc", 0},
54 
        {"ab", "abc", -1},
55 
        {"abc", "ab", 1},
56 
        {"x", "ab", 1},
57 
        {"ab", "x", -1},
58 
        {"x", "a", 1},
59 
        {"b", "x", -1},
60 
}
61 
 
62 
func TestCompare(t *testing.T) {
63 
        for _, tt := range comparetests {
64 
                a := []byte(tt.a)
65 
                b := []byte(tt.b)
66 
                cmp := Compare(a, b)
67 
                if cmp != tt.i {
68 
                        t.Errorf(`Compare(%q, %q) = %v`, tt.a, tt.b, cmp)
69 
                }
70 
                eql := Equal(a, b)
71 
                if eql != (tt.i == 0) {
72 
                        t.Errorf(`Equal(%q, %q) = %v`, tt.a, tt.b, eql)
73 
                }
74 
                eql = EqualPortable(a, b)
75 
                if eql != (tt.i == 0) {
76 
                        t.Errorf(`EqualPortable(%q, %q) = %v`, tt.a, tt.b, eql)
77 
                }
78 
        }
79 
}
80 
 
81 
var indexTests = []BinOpTest{
82 
        {"", "", 0},
83 
        {"", "a", -1},
84 
        {"", "foo", -1},
85 
        {"fo", "foo", -1},
86 
        {"foo", "foo", 0},
87 
        {"oofofoofooo", "f", 2},
88 
        {"oofofoofooo", "foo", 4},
89 
        {"barfoobarfoo", "foo", 3},
90 
        {"foo", "", 0},
91 
        {"foo", "o", 1},
92 
        {"abcABCabc", "A", 3},
93 
        // cases with one byte strings - test IndexByte and special case in Index()
94 
        {"", "a", -1},
95 
        {"x", "a", -1},
96 
        {"x", "x", 0},
97 
        {"abc", "a", 0},
98 
        {"abc", "b", 1},
99 
        {"abc", "c", 2},
100 
        {"abc", "x", -1},
101 
        {"barfoobarfooyyyzzzyyyzzzyyyzzzyyyxxxzzzyyy", "x", 33},
102 
        {"foofyfoobarfoobar", "y", 4},
103 
        {"oooooooooooooooooooooo", "r", -1},
104 
}
105 
 
106 
var lastIndexTests = []BinOpTest{
107 
        {"", "", 0},
108 
        {"", "a", -1},
109 
        {"", "foo", -1},
110 
        {"fo", "foo", -1},
111 
        {"foo", "foo", 0},
112 
        {"foo", "f", 0},
113 
        {"oofofoofooo", "f", 7},
114 
        {"oofofoofooo", "foo", 7},
115 
        {"barfoobarfoo", "foo", 9},
116 
        {"foo", "", 3},
117 
        {"foo", "o", 2},
118 
        {"abcABCabc", "A", 3},
119 
        {"abcABCabc", "a", 6},
120 
}
121 
 
122 
var indexAnyTests = []BinOpTest{
123 
        {"", "", -1},
124 
        {"", "a", -1},
125 
        {"", "abc", -1},
126 
        {"a", "", -1},
127 
        {"a", "a", 0},
128 
        {"aaa", "a", 0},
129 
        {"abc", "xyz", -1},
130 
        {"abc", "xcz", 2},
131 
        {"ab☺c", "x☺yz", 2},
132 
        {"aRegExp*", ".(|)*+?^$[]", 7},
133 
        {dots + dots + dots, " ", -1},
134 
}
135 
 
136 
var lastIndexAnyTests = []BinOpTest{
137 
        {"", "", -1},
138 
        {"", "a", -1},
139 
        {"", "abc", -1},
140 
        {"a", "", -1},
141 
        {"a", "a", 0},
142 
        {"aaa", "a", 2},
143 
        {"abc", "xyz", -1},
144 
        {"abc", "ab", 1},
145 
        {"a☺b☻c☹d", "uvw☻xyz", 2 + len("☺")},
146 
        {"a.RegExp*", ".(|)*+?^$[]", 8},
147 
        {dots + dots + dots, " ", -1},
148 
}
149 
 
150 
var indexRuneTests = []BinOpTest{
151 
        {"", "a", -1},
152 
        {"", "☺", -1},
153 
        {"foo", "☹", -1},
154 
        {"foo", "o", 1},
155 
        {"foo☺bar", "☺", 3},
156 
        {"foo☺☻☹bar", "☹", 9},
157 
}
158 
 
159 
// Execute f on each test case.  funcName should be the name of f; it's used
160 
// in failure reports.
161 
func runIndexTests(t *testing.T, f func(s, sep []byte) int, funcName string, testCases []BinOpTest) {
162 
        for _, test := range testCases {
163 
                a := []byte(test.a)
164 
                b := []byte(test.b)
165 
                actual := f(a, b)
166 
                if actual != test.i {
167 
                        t.Errorf("%s(%q,%q) = %v; want %v", funcName, a, b, actual, test.i)
168 
                }
169 
        }
170 
}
171 
 
172 
func runIndexAnyTests(t *testing.T, f func(s []byte, chars string) int, funcName string, testCases []BinOpTest) {
173 
        for _, test := range testCases {
174 
                a := []byte(test.a)
175 
                actual := f(a, test.b)
176 
                if actual != test.i {
177 
                        t.Errorf("%s(%q,%q) = %v; want %v", funcName, a, test.b, actual, test.i)
178 
                }
179 
        }
180 
}
181 
 
182 
func TestIndex(t *testing.T)     { runIndexTests(t, Index, "Index", indexTests) }
183 
func TestLastIndex(t *testing.T) { runIndexTests(t, LastIndex, "LastIndex", lastIndexTests) }
184 
func TestIndexAny(t *testing.T)  { runIndexAnyTests(t, IndexAny, "IndexAny", indexAnyTests) }
185 
func TestLastIndexAny(t *testing.T) {
186 
        runIndexAnyTests(t, LastIndexAny, "LastIndexAny", lastIndexAnyTests)
187 
}
188 
 
189 
func TestIndexByte(t *testing.T) {
190 
        for _, tt := range indexTests {
191 
                if len(tt.b) != 1 {
192 
                        continue
193 
                }
194 
                a := []byte(tt.a)
195 
                b := tt.b[0]
196 
                pos := IndexByte(a, b)
197 
                if pos != tt.i {
198 
                        t.Errorf(`IndexByte(%q, '%c') = %v`, tt.a, b, pos)
199 
                }
200 
                posp := IndexBytePortable(a, b)
201 
                if posp != tt.i {
202 
                        t.Errorf(`indexBytePortable(%q, '%c') = %v`, tt.a, b, posp)
203 
                }
204 
        }
205 
}
206 
 
207 
// test a larger buffer with different sizes and alignments
208 
func TestIndexByteBig(t *testing.T) {
209 
        var n = 1024
210 
        if testing.Short() {
211 
                n = 128
212 
        }
213 
        b := make([]byte, n)
214 
        for i := 0; i < n; i++ {
215 
                // different start alignments
216 
                b1 := b[i:]
217 
                for j := 0; j < len(b1); j++ {
218 
                        b1[j] = 'x'
219 
                        pos := IndexByte(b1, 'x')
220 
                        if pos != j {
221 
                                t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
222 
                        }
223 
                        b1[j] = 0
224 
                        pos = IndexByte(b1, 'x')
225 
                        if pos != -1 {
226 
                                t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
227 
                        }
228 
                }
229 
                // different end alignments
230 
                b1 = b[:i]
231 
                for j := 0; j < len(b1); j++ {
232 
                        b1[j] = 'x'
233 
                        pos := IndexByte(b1, 'x')
234 
                        if pos != j {
235 
                                t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
236 
                        }
237 
                        b1[j] = 0
238 
                        pos = IndexByte(b1, 'x')
239 
                        if pos != -1 {
240 
                                t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
241 
                        }
242 
                }
243 
                // different start and end alignments
244 
                b1 = b[i/2 : n-(i+1)/2]
245 
                for j := 0; j < len(b1); j++ {
246 
                        b1[j] = 'x'
247 
                        pos := IndexByte(b1, 'x')
248 
                        if pos != j {
249 
                                t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
250 
                        }
251 
                        b1[j] = 0
252 
                        pos = IndexByte(b1, 'x')
253 
                        if pos != -1 {
254 
                                t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
255 
                        }
256 
                }
257 
        }
258 
}
259 
 
260 
func TestIndexRune(t *testing.T) {
261 
        for _, tt := range indexRuneTests {
262 
                a := []byte(tt.a)
263 
                r, _ := utf8.DecodeRuneInString(tt.b)
264 
                pos := IndexRune(a, r)
265 
                if pos != tt.i {
266 
                        t.Errorf(`IndexRune(%q, '%c') = %v`, tt.a, r, pos)
267 
                }
268 
        }
269 
}
270 
 
271 
var bmbuf []byte
272 
 
273 
func BenchmarkIndexByte32(b *testing.B)          { bmIndexByte(b, IndexByte, 32) }
274 
func BenchmarkIndexByte4K(b *testing.B)          { bmIndexByte(b, IndexByte, 4<<10) }
275 
func BenchmarkIndexByte4M(b *testing.B)          { bmIndexByte(b, IndexByte, 4<<20) }
276 
func BenchmarkIndexByte64M(b *testing.B)         { bmIndexByte(b, IndexByte, 64<<20) }
277 
func BenchmarkIndexBytePortable32(b *testing.B)  { bmIndexByte(b, IndexBytePortable, 32) }
278 
func BenchmarkIndexBytePortable4K(b *testing.B)  { bmIndexByte(b, IndexBytePortable, 4<<10) }
279 
func BenchmarkIndexBytePortable4M(b *testing.B)  { bmIndexByte(b, IndexBytePortable, 4<<20) }
280 
func BenchmarkIndexBytePortable64M(b *testing.B) { bmIndexByte(b, IndexBytePortable, 64<<20) }
281 
 
282 
func bmIndexByte(b *testing.B, index func([]byte, byte) int, n int) {
283 
        if len(bmbuf) < n {
284 
                bmbuf = make([]byte, n)
285 
        }
286 
        b.SetBytes(int64(n))
287 
        buf := bmbuf[0:n]
288 
        buf[n-1] = 'x'
289 
        for i := 0; i < b.N; i++ {
290 
                j := index(buf, 'x')
291 
                if j != n-1 {
292 
                        b.Fatal("bad index", j)
293 
                }
294 
        }
295 
        buf[n-1] = '\x00'
296 
}
297 
 
298 
func BenchmarkEqual32(b *testing.B)          { bmEqual(b, Equal, 32) }
299 
func BenchmarkEqual4K(b *testing.B)          { bmEqual(b, Equal, 4<<10) }
300 
func BenchmarkEqual4M(b *testing.B)          { bmEqual(b, Equal, 4<<20) }
301 
func BenchmarkEqual64M(b *testing.B)         { bmEqual(b, Equal, 64<<20) }
302 
func BenchmarkEqualPort32(b *testing.B)      { bmEqual(b, EqualPortable, 32) }
303 
func BenchmarkEqualPort4K(b *testing.B)      { bmEqual(b, EqualPortable, 4<<10) }
304 
func BenchmarkEqualPortable4M(b *testing.B)  { bmEqual(b, EqualPortable, 4<<20) }
305 
func BenchmarkEqualPortable64M(b *testing.B) { bmEqual(b, EqualPortable, 64<<20) }
306 
 
307 
func bmEqual(b *testing.B, equal func([]byte, []byte) bool, n int) {
308 
        if len(bmbuf) < 2*n {
309 
                bmbuf = make([]byte, 2*n)
310 
        }
311 
        b.SetBytes(int64(n))
312 
        buf1 := bmbuf[0:n]
313 
        buf2 := bmbuf[n : 2*n]
314 
        buf1[n-1] = 'x'
315 
        buf2[n-1] = 'x'
316 
        for i := 0; i < b.N; i++ {
317 
                eq := equal(buf1, buf2)
318 
                if !eq {
319 
                        b.Fatal("bad equal")
320 
                }
321 
        }
322 
        buf1[n-1] = '\x00'
323 
        buf2[n-1] = '\x00'
324 
}
325 
 
326 
func BenchmarkIndex32(b *testing.B)  { bmIndex(b, Index, 32) }
327 
func BenchmarkIndex4K(b *testing.B)  { bmIndex(b, Index, 4<<10) }
328 
func BenchmarkIndex4M(b *testing.B)  { bmIndex(b, Index, 4<<20) }
329 
func BenchmarkIndex64M(b *testing.B) { bmIndex(b, Index, 64<<20) }
330 
 
331 
func bmIndex(b *testing.B, index func([]byte, []byte) int, n int) {
332 
        if len(bmbuf) < n {
333 
                bmbuf = make([]byte, n)
334 
        }
335 
        b.SetBytes(int64(n))
336 
        buf := bmbuf[0:n]
337 
        buf[n-1] = 'x'
338 
        for i := 0; i < b.N; i++ {
339 
                j := index(buf, buf[n-7:])
340 
                if j != n-7 {
341 
                        b.Fatal("bad index", j)
342 
                }
343 
        }
344 
        buf[n-1] = '\x00'
345 
}
346 
 
347 
func BenchmarkIndexEasy32(b *testing.B)  { bmIndexEasy(b, Index, 32) }
348 
func BenchmarkIndexEasy4K(b *testing.B)  { bmIndexEasy(b, Index, 4<<10) }
349 
func BenchmarkIndexEasy4M(b *testing.B)  { bmIndexEasy(b, Index, 4<<20) }
350 
func BenchmarkIndexEasy64M(b *testing.B) { bmIndexEasy(b, Index, 64<<20) }
351 
 
352 
func bmIndexEasy(b *testing.B, index func([]byte, []byte) int, n int) {
353 
        if len(bmbuf) < n {
354 
                bmbuf = make([]byte, n)
355 
        }
356 
        b.SetBytes(int64(n))
357 
        buf := bmbuf[0:n]
358 
        buf[n-1] = 'x'
359 
        buf[n-7] = 'x'
360 
        for i := 0; i < b.N; i++ {
361 
                j := index(buf, buf[n-7:])
362 
                if j != n-7 {
363 
                        b.Fatal("bad index", j)
364 
                }
365 
        }
366 
        buf[n-1] = '\x00'
367 
        buf[n-7] = '\x00'
368 
}
369 
 
370 
func BenchmarkCount32(b *testing.B)  { bmCount(b, Count, 32) }
371 
func BenchmarkCount4K(b *testing.B)  { bmCount(b, Count, 4<<10) }
372 
func BenchmarkCount4M(b *testing.B)  { bmCount(b, Count, 4<<20) }
373 
func BenchmarkCount64M(b *testing.B) { bmCount(b, Count, 64<<20) }
374 
 
375 
func bmCount(b *testing.B, count func([]byte, []byte) int, n int) {
376 
        if len(bmbuf) < n {
377 
                bmbuf = make([]byte, n)
378 
        }
379 
        b.SetBytes(int64(n))
380 
        buf := bmbuf[0:n]
381 
        buf[n-1] = 'x'
382 
        for i := 0; i < b.N; i++ {
383 
                j := count(buf, buf[n-7:])
384 
                if j != 1 {
385 
                        b.Fatal("bad count", j)
386 
                }
387 
        }
388 
        buf[n-1] = '\x00'
389 
}
390 
 
391 
func BenchmarkCountEasy32(b *testing.B)  { bmCountEasy(b, Count, 32) }
392 
func BenchmarkCountEasy4K(b *testing.B)  { bmCountEasy(b, Count, 4<<10) }
393 
func BenchmarkCountEasy4M(b *testing.B)  { bmCountEasy(b, Count, 4<<20) }
394 
func BenchmarkCountEasy64M(b *testing.B) { bmCountEasy(b, Count, 64<<20) }
395 
 
396 
func bmCountEasy(b *testing.B, count func([]byte, []byte) int, n int) {
397 
        if len(bmbuf) < n {
398 
                bmbuf = make([]byte, n)
399 
        }
400 
        b.SetBytes(int64(n))
401 
        buf := bmbuf[0:n]
402 
        buf[n-1] = 'x'
403 
        buf[n-7] = 'x'
404 
        for i := 0; i < b.N; i++ {
405 
                j := count(buf, buf[n-7:])
406 
                if j != 1 {
407 
                        b.Fatal("bad count", j)
408 
                }
409 
        }
410 
        buf[n-1] = '\x00'
411 
        buf[n-7] = '\x00'
412 
}
413 
 
414 
type ExplodeTest struct {
415 
        s string
416 
        n int
417 
        a []string
418 
}
419 
 
420 
var explodetests = []ExplodeTest{
421 
        {"", -1, []string{}},
422 
        {abcd, -1, []string{"a", "b", "c", "d"}},
423 
        {faces, -1, []string{"☺", "☻", "☹"}},
424 
        {abcd, 2, []string{"a", "bcd"}},
425 
}
426 
 
427 
func TestExplode(t *testing.T) {
428 
        for _, tt := range explodetests {
429 
                a := SplitN([]byte(tt.s), nil, tt.n)
430 
                result := arrayOfString(a)
431 
                if !eq(result, tt.a) {
432 
                        t.Errorf(`Explode("%s", %d) = %v; want %v`, tt.s, tt.n, result, tt.a)
433 
                        continue
434 
                }
435 
                s := Join(a, []byte{})
436 
                if string(s) != tt.s {
437 
                        t.Errorf(`Join(Explode("%s", %d), "") = "%s"`, tt.s, tt.n, s)
438 
                }
439 
        }
440 
}
441 
 
442 
type SplitTest struct {
443 
        s   string
444 
        sep string
445 
        n   int
446 
        a   []string
447 
}
448 
 
449 
var splittests = []SplitTest{
450 
        {abcd, "a", 0, nil},
451 
        {abcd, "a", -1, []string{"", "bcd"}},
452 
        {abcd, "z", -1, []string{"abcd"}},
453 
        {abcd, "", -1, []string{"a", "b", "c", "d"}},
454 
        {commas, ",", -1, []string{"1", "2", "3", "4"}},
455 
        {dots, "...", -1, []string{"1", ".2", ".3", ".4"}},
456 
        {faces, "☹", -1, []string{"☺☻", ""}},
457 
        {faces, "~", -1, []string{faces}},
458 
        {faces, "", -1, []string{"☺", "☻", "☹"}},
459 
        {"1 2 3 4", " ", 3, []string{"1", "2", "3 4"}},
460 
        {"1 2", " ", 3, []string{"1", "2"}},
461 
        {"123", "", 2, []string{"1", "23"}},
462 
        {"123", "", 17, []string{"1", "2", "3"}},
463 
}
464 
 
465 
func TestSplit(t *testing.T) {
466 
        for _, tt := range splittests {
467 
                a := SplitN([]byte(tt.s), []byte(tt.sep), tt.n)
468 
                result := arrayOfString(a)
469 
                if !eq(result, tt.a) {
470 
                        t.Errorf(`Split(%q, %q, %d) = %v; want %v`, tt.s, tt.sep, tt.n, result, tt.a)
471 
                        continue
472 
                }
473 
                if tt.n == 0 {
474 
                        continue
475 
                }
476 
                s := Join(a, []byte(tt.sep))
477 
                if string(s) != tt.s {
478 
                        t.Errorf(`Join(Split(%q, %q, %d), %q) = %q`, tt.s, tt.sep, tt.n, tt.sep, s)
479 
                }
480 
                if tt.n < 0 {
481 
                        b := Split([]byte(tt.s), []byte(tt.sep))
482 
                        if !reflect.DeepEqual(a, b) {
483 
                                t.Errorf("Split disagrees withSplitN(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, b, a)
484 
                        }
485 
                }
486 
        }
487 
}
488 
 
489 
var splitaftertests = []SplitTest{
490 
        {abcd, "a", -1, []string{"a", "bcd"}},
491 
        {abcd, "z", -1, []string{"abcd"}},
492 
        {abcd, "", -1, []string{"a", "b", "c", "d"}},
493 
        {commas, ",", -1, []string{"1,", "2,", "3,", "4"}},
494 
        {dots, "...", -1, []string{"1...", ".2...", ".3...", ".4"}},
495 
        {faces, "☹", -1, []string{"☺☻☹", ""}},
496 
        {faces, "~", -1, []string{faces}},
497 
        {faces, "", -1, []string{"☺", "☻", "☹"}},
498 
        {"1 2 3 4", " ", 3, []string{"1 ", "2 ", "3 4"}},
499 
        {"1 2 3", " ", 3, []string{"1 ", "2 ", "3"}},
500 
        {"1 2", " ", 3, []string{"1 ", "2"}},
501 
        {"123", "", 2, []string{"1", "23"}},
502 
        {"123", "", 17, []string{"1", "2", "3"}},
503 
}
504 
 
505 
func TestSplitAfter(t *testing.T) {
506 
        for _, tt := range splitaftertests {
507 
                a := SplitAfterN([]byte(tt.s), []byte(tt.sep), tt.n)
508 
                result := arrayOfString(a)
509 
                if !eq(result, tt.a) {
510 
                        t.Errorf(`Split(%q, %q, %d) = %v; want %v`, tt.s, tt.sep, tt.n, result, tt.a)
511 
                        continue
512 
                }
513 
                s := Join(a, nil)
514 
                if string(s) != tt.s {
515 
                        t.Errorf(`Join(Split(%q, %q, %d), %q) = %q`, tt.s, tt.sep, tt.n, tt.sep, s)
516 
                }
517 
                if tt.n < 0 {
518 
                        b := SplitAfter([]byte(tt.s), []byte(tt.sep))
519 
                        if !reflect.DeepEqual(a, b) {
520 
                                t.Errorf("SplitAfter disagrees withSplitAfterN(%q, %q, %d) = %v; want %v", tt.s, tt.sep, tt.n, b, a)
521 
                        }
522 
                }
523 
        }
524 
}
525 
 
526 
type FieldsTest struct {
527 
        s string
528 
        a []string
529 
}
530 
 
531 
var fieldstests = []FieldsTest{
532 
        {"", []string{}},
533 
        {" ", []string{}},
534 
        {" \t ", []string{}},
535 
        {"  abc  ", []string{"abc"}},
536 
        {"1 2 3 4", []string{"1", "2", "3", "4"}},
537 
        {"1  2  3  4", []string{"1", "2", "3", "4"}},
538 
        {"1\t\t2\t\t3\t4", []string{"1", "2", "3", "4"}},
539 
        {"1\u20002\u20013\u20024", []string{"1", "2", "3", "4"}},
540 
        {"\u2000\u2001\u2002", []string{}},
541 
        {"\n™\t™\n", []string{"™", "™"}},
542 
        {faces, []string{faces}},
543 
}
544 
 
545 
func TestFields(t *testing.T) {
546 
        for _, tt := range fieldstests {
547 
                a := Fields([]byte(tt.s))
548 
                result := arrayOfString(a)
549 
                if !eq(result, tt.a) {
550 
                        t.Errorf("Fields(%q) = %v; want %v", tt.s, a, tt.a)
551 
                        continue
552 
                }
553 
        }
554 
}
555 
 
556 
func TestFieldsFunc(t *testing.T) {
557 
        pred := func(c rune) bool { return c == 'X' }
558 
        var fieldsFuncTests = []FieldsTest{
559 
                {"", []string{}},
560 
                {"XX", []string{}},
561 
                {"XXhiXXX", []string{"hi"}},
562 
                {"aXXbXXXcX", []string{"a", "b", "c"}},
563 
        }
564 
        for _, tt := range fieldsFuncTests {
565 
                a := FieldsFunc([]byte(tt.s), pred)
566 
                result := arrayOfString(a)
567 
                if !eq(result, tt.a) {
568 
                        t.Errorf("FieldsFunc(%q) = %v, want %v", tt.s, a, tt.a)
569 
                }
570 
        }
571 
}
572 
 
573 
// Test case for any function which accepts and returns a byte array.
574 
// For ease of creation, we write the byte arrays as strings.
575 
type StringTest struct {
576 
        in, out string
577 
}
578 
 
579 
var upperTests = []StringTest{
580 
        {"", ""},
581 
        {"abc", "ABC"},
582 
        {"AbC123", "ABC123"},
583 
        {"azAZ09_", "AZAZ09_"},
584 
        {"\u0250\u0250\u0250\u0250\u0250", "\u2C6F\u2C6F\u2C6F\u2C6F\u2C6F"}, // grows one byte per char
585 
}
586 
 
587 
var lowerTests = []StringTest{
588 
        {"", ""},
589 
        {"abc", "abc"},
590 
        {"AbC123", "abc123"},
591 
        {"azAZ09_", "azaz09_"},
592 
        {"\u2C6D\u2C6D\u2C6D\u2C6D\u2C6D", "\u0251\u0251\u0251\u0251\u0251"}, // shrinks one byte per char
593 
}
594 
 
595 
const space = "\t\v\r\f\n\u0085\u00a0\u2000\u3000"
596 
 
597 
var trimSpaceTests = []StringTest{
598 
        {"", ""},
599 
        {"abc", "abc"},
600 
        {space + "abc" + space, "abc"},
601 
        {" ", ""},
602 
        {" \t\r\n \t\t\r\r\n\n ", ""},
603 
        {" \t\r\n x\t\t\r\r\n\n ", "x"},
604 
        {" \u2000\t\r\n x\t\t\r\r\ny\n \u3000", "x\t\t\r\r\ny"},
605 
        {"1 \t\r\n2", "1 \t\r\n2"},
606 
        {" x\x80", "x\x80"},
607 
        {" x\xc0", "x\xc0"},
608 
        {"x \xc0\xc0 ", "x \xc0\xc0"},
609 
        {"x \xc0", "x \xc0"},
610 
        {"x \xc0 ", "x \xc0"},
611 
        {"x \xc0\xc0 ", "x \xc0\xc0"},
612 
        {"x ☺\xc0\xc0 ", "x ☺\xc0\xc0"},
613 
        {"x ☺ ", "x ☺"},
614 
}
615 
 
616 
// Execute f on each test case.  funcName should be the name of f; it's used
617 
// in failure reports.
618 
func runStringTests(t *testing.T, f func([]byte) []byte, funcName string, testCases []StringTest) {
619 
        for _, tc := range testCases {
620 
                actual := string(f([]byte(tc.in)))
621 
                if actual != tc.out {
622 
                        t.Errorf("%s(%q) = %q; want %q", funcName, tc.in, actual, tc.out)
623 
                }
624 
        }
625 
}
626 
 
627 
func tenRunes(r rune) string {
628 
        runes := make([]rune, 10)
629 
        for i := range runes {
630 
                runes[i] = r
631 
        }
632 
        return string(runes)
633 
}
634 
 
635 
// User-defined self-inverse mapping function
636 
func rot13(r rune) rune {
637 
        const step = 13
638 
        if r >= 'a' && r <= 'z' {
639 
                return ((r - 'a' + step) % 26) + 'a'
640 
        }
641 
        if r >= 'A' && r <= 'Z' {
642 
                return ((r - 'A' + step) % 26) + 'A'
643 
        }
644 
        return r
645 
}
646 
 
647 
func TestMap(t *testing.T) {
648 
        // Run a couple of awful growth/shrinkage tests
649 
        a := tenRunes('a')
650 
 
651 
        // 1.  Grow.  This triggers two reallocations in Map.
652 
        maxRune := func(r rune) rune { return unicode.MaxRune }
653 
        m := Map(maxRune, []byte(a))
654 
        expect := tenRunes(unicode.MaxRune)
655 
        if string(m) != expect {
656 
                t.Errorf("growing: expected %q got %q", expect, m)
657 
        }
658 
 
659 
        // 2. Shrink
660 
        minRune := func(r rune) rune { return 'a' }
661 
        m = Map(minRune, []byte(tenRunes(unicode.MaxRune)))
662 
        expect = a
663 
        if string(m) != expect {
664 
                t.Errorf("shrinking: expected %q got %q", expect, m)
665 
        }
666 
 
667 
        // 3. Rot13
668 
        m = Map(rot13, []byte("a to zed"))
669 
        expect = "n gb mrq"
670 
        if string(m) != expect {
671 
                t.Errorf("rot13: expected %q got %q", expect, m)
672 
        }
673 
 
674 
        // 4. Rot13^2
675 
        m = Map(rot13, Map(rot13, []byte("a to zed")))
676 
        expect = "a to zed"
677 
        if string(m) != expect {
678 
                t.Errorf("rot13: expected %q got %q", expect, m)
679 
        }
680 
 
681 
        // 5. Drop
682 
        dropNotLatin := func(r rune) rune {
683 
                if unicode.Is(unicode.Latin, r) {
684 
                        return r
685 
                }
686 
                return -1
687 
        }
688 
        m = Map(dropNotLatin, []byte("Hello, 세계"))
689 
        expect = "Hello"
690 
        if string(m) != expect {
691 
                t.Errorf("drop: expected %q got %q", expect, m)
692 
        }
693 
}
694 
 
695 
func TestToUpper(t *testing.T) { runStringTests(t, ToUpper, "ToUpper", upperTests) }
696 
 
697 
func TestToLower(t *testing.T) { runStringTests(t, ToLower, "ToLower", lowerTests) }
698 
 
699 
func TestTrimSpace(t *testing.T) { runStringTests(t, TrimSpace, "TrimSpace", trimSpaceTests) }
700 
 
701 
type RepeatTest struct {
702 
        in, out string
703 
        count   int
704 
}
705 
 
706 
var RepeatTests = []RepeatTest{
707 
        {"", "", 0},
708 
        {"", "", 1},
709 
        {"", "", 2},
710 
        {"-", "", 0},
711 
        {"-", "-", 1},
712 
        {"-", "----------", 10},
713 
        {"abc ", "abc abc abc ", 3},
714 
}
715 
 
716 
func TestRepeat(t *testing.T) {
717 
        for _, tt := range RepeatTests {
718 
                tin := []byte(tt.in)
719 
                tout := []byte(tt.out)
720 
                a := Repeat(tin, tt.count)
721 
                if !Equal(a, tout) {
722 
                        t.Errorf("Repeat(%q, %d) = %q; want %q", tin, tt.count, a, tout)
723 
                        continue
724 
                }
725 
        }
726 
}
727 
 
728 
func runesEqual(a, b []rune) bool {
729 
        if len(a) != len(b) {
730 
                return false
731 
        }
732 
        for i, r := range a {
733 
                if r != b[i] {
734 
                        return false
735 
                }
736 
        }
737 
        return true
738 
}
739 
 
740 
type RunesTest struct {
741 
        in    string
742 
        out   []rune
743 
        lossy bool
744 
}
745 
 
746 
var RunesTests = []RunesTest{
747 
        {"", []rune{}, false},
748 
        {" ", []rune{32}, false},
749 
        {"ABC", []rune{65, 66, 67}, false},
750 
        {"abc", []rune{97, 98, 99}, false},
751 
        {"\u65e5\u672c\u8a9e", []rune{26085, 26412, 35486}, false},
752 
        {"ab\x80c", []rune{97, 98, 0xFFFD, 99}, true},
753 
        {"ab\xc0c", []rune{97, 98, 0xFFFD, 99}, true},
754 
}
755 
 
756 
func TestRunes(t *testing.T) {
757 
        for _, tt := range RunesTests {
758 
                tin := []byte(tt.in)
759 
                a := Runes(tin)
760 
                if !runesEqual(a, tt.out) {
761 
                        t.Errorf("Runes(%q) = %v; want %v", tin, a, tt.out)
762 
                        continue
763 
                }
764 
                if !tt.lossy {
765 
                        // can only test reassembly if we didn't lose information
766 
                        s := string(a)
767 
                        if s != tt.in {
768 
                                t.Errorf("string(Runes(%q)) = %x; want %x", tin, s, tin)
769 
                        }
770 
                }
771 
        }
772 
}
773 
 
774 
type TrimTest struct {
775 
        f               string
776 
        in, cutset, out string
777 
}
778 
 
779 
var trimTests = []TrimTest{
780 
        {"Trim", "abba", "a", "bb"},
781 
        {"Trim", "abba", "ab", ""},
782 
        {"TrimLeft", "abba", "ab", ""},
783 
        {"TrimRight", "abba", "ab", ""},
784 
        {"TrimLeft", "abba", "a", "bba"},
785 
        {"TrimRight", "abba", "a", "abb"},
786 
        {"Trim", "", "<>", "tag"},
787 
        {"Trim", "* listitem", " *", "listitem"},
788 
        {"Trim", `"quote"`, `"`, "quote"},
789 
        {"Trim", "\u2C6F\u2C6F\u0250\u0250\u2C6F\u2C6F", "\u2C6F", "\u0250\u0250"},
790 
        //empty string tests
791 
        {"Trim", "abba", "", "abba"},
792 
        {"Trim", "", "123", ""},
793 
        {"Trim", "", "", ""},
794 
        {"TrimLeft", "abba", "", "abba"},
795 
        {"TrimLeft", "", "123", ""},
796 
        {"TrimLeft", "", "", ""},
797 
        {"TrimRight", "abba", "", "abba"},
798 
        {"TrimRight", "", "123", ""},
799 
        {"TrimRight", "", "", ""},
800 
        {"TrimRight", "☺\xc0", "☺", "☺\xc0"},
801 
}
802 
 
803 
func TestTrim(t *testing.T) {
804 
        for _, tc := range trimTests {
805 
                name := tc.f
806 
                var f func([]byte, string) []byte
807 
                switch name {
808 
                case "Trim":
809 
                        f = Trim
810 
                case "TrimLeft":
811 
                        f = TrimLeft
812 
                case "TrimRight":
813 
                        f = TrimRight
814 
                default:
815 
                        t.Errorf("Undefined trim function %s", name)
816 
                }
817 
                actual := string(f([]byte(tc.in), tc.cutset))
818 
                if actual != tc.out {
819 
                        t.Errorf("%s(%q, %q) = %q; want %q", name, tc.in, tc.cutset, actual, tc.out)
820 
                }
821 
        }
822 
}
823 
 
824 
type predicate struct {
825 
        f    func(r rune) bool
826 
        name string
827 
}
828 
 
829 
var isSpace = predicate{unicode.IsSpace, "IsSpace"}
830 
var isDigit = predicate{unicode.IsDigit, "IsDigit"}
831 
var isUpper = predicate{unicode.IsUpper, "IsUpper"}
832 
var isValidRune = predicate{
833 
        func(r rune) bool {
834 
                return r != utf8.RuneError
835 
        },
836 
        "IsValidRune",
837 
}
838 
 
839 
type TrimFuncTest struct {
840 
        f       predicate
841 
        in, out string
842 
}
843 
 
844 
func not(p predicate) predicate {
845 
        return predicate{
846 
                func(r rune) bool {
847 
                        return !p.f(r)
848 
                },
849 
                "not " + p.name,
850 
        }
851 
}
852 
 
853 
var trimFuncTests = []TrimFuncTest{
854 
        {isSpace, space + " hello " + space, "hello"},
855 
        {isDigit, "\u0e50\u0e5212hello34\u0e50\u0e51", "hello"},
856 
        {isUpper, "\u2C6F\u2C6F\u2C6F\u2C6FABCDhelloEF\u2C6F\u2C6FGH\u2C6F\u2C6F", "hello"},
857 
        {not(isSpace), "hello" + space + "hello", space},
858 
        {not(isDigit), "hello\u0e50\u0e521234\u0e50\u0e51helo", "\u0e50\u0e521234\u0e50\u0e51"},
859 
        {isValidRune, "ab\xc0a\xc0cd", "\xc0a\xc0"},
860 
        {not(isValidRune), "\xc0a\xc0", "a"},
861 
}
862 
 
863 
func TestTrimFunc(t *testing.T) {
864 
        for _, tc := range trimFuncTests {
865 
                actual := string(TrimFunc([]byte(tc.in), tc.f.f))
866 
                if actual != tc.out {
867 
                        t.Errorf("TrimFunc(%q, %q) = %q; want %q", tc.in, tc.f.name, actual, tc.out)
868 
                }
869 
        }
870 
}
871 
 
872 
type IndexFuncTest struct {
873 
        in          string
874 
        f           predicate
875 
        first, last int
876 
}
877 
 
878 
var indexFuncTests = []IndexFuncTest{
879 
        {"", isValidRune, -1, -1},
880 
        {"abc", isDigit, -1, -1},
881 
        {"0123", isDigit, 0, 3},
882 
        {"a1b", isDigit, 1, 1},
883 
        {space, isSpace, 0, len(space) - 3}, // last rune in space is 3 bytes
884 
        {"\u0e50\u0e5212hello34\u0e50\u0e51", isDigit, 0, 18},
885 
        {"\u2C6F\u2C6F\u2C6F\u2C6FABCDhelloEF\u2C6F\u2C6FGH\u2C6F\u2C6F", isUpper, 0, 34},
886 
        {"12\u0e50\u0e52hello34\u0e50\u0e51", not(isDigit), 8, 12},
887 
 
888 
        // tests of invalid UTF-8
889 
        {"\x801", isDigit, 1, 1},
890 
        {"\x80abc", isDigit, -1, -1},
891 
        {"\xc0a\xc0", isValidRune, 1, 1},
892 
        {"\xc0a\xc0", not(isValidRune), 0, 2},
893 
        {"\xc0☺\xc0", not(isValidRune), 0, 4},
894 
        {"\xc0☺\xc0\xc0", not(isValidRune), 0, 5},
895 
        {"ab\xc0a\xc0cd", not(isValidRune), 2, 4},
896 
        {"a\xe0\x80cd", not(isValidRune), 1, 2},
897 
}
898 
 
899 
func TestIndexFunc(t *testing.T) {
900 
        for _, tc := range indexFuncTests {
901 
                first := IndexFunc([]byte(tc.in), tc.f.f)
902 
                if first != tc.first {
903 
                        t.Errorf("IndexFunc(%q, %s) = %d; want %d", tc.in, tc.f.name, first, tc.first)
904 
                }
905 
                last := LastIndexFunc([]byte(tc.in), tc.f.f)
906 
                if last != tc.last {
907 
                        t.Errorf("LastIndexFunc(%q, %s) = %d; want %d", tc.in, tc.f.name, last, tc.last)
908 
                }
909 
        }
910 
}
911 
 
912 
type ReplaceTest struct {
913 
        in       string
914 
        old, new string
915 
        n        int
916 
        out      string
917 
}
918 
 
919 
var ReplaceTests = []ReplaceTest{
920 
        {"hello", "l", "L", 0, "hello"},
921 
        {"hello", "l", "L", -1, "heLLo"},
922 
        {"hello", "x", "X", -1, "hello"},
923 
        {"", "x", "X", -1, ""},
924 
        {"radar", "r", "", -1, "ada"},
925 
        {"", "", "<>", -1, "<>"},
926 
        {"banana", "a", "<>", -1, "b<>n<>n<>"},
927 
        {"banana", "a", "<>", 1, "b<>nana"},
928 
        {"banana", "a", "<>", 1000, "b<>n<>n<>"},
929 
        {"banana", "an", "<>", -1, "b<><>a"},
930 
        {"banana", "ana", "<>", -1, "b<>na"},
931 
        {"banana", "", "<>", -1, "<>b<>a<>n<>a<>n<>a<>"},
932 
        {"banana", "", "<>", 10, "<>b<>a<>n<>a<>n<>a<>"},
933 
        {"banana", "", "<>", 6, "<>b<>a<>n<>a<>n<>a"},
934 
        {"banana", "", "<>", 5, "<>b<>a<>n<>a<>na"},
935 
        {"banana", "", "<>", 1, "<>banana"},
936 
        {"banana", "a", "a", -1, "banana"},
937 
        {"banana", "a", "a", 1, "banana"},
938 
        {"☺☻☹", "", "<>", -1, "<>☺<>☻<>☹<>"},
939 
}
940 
 
941 
func TestReplace(t *testing.T) {
942 
        for _, tt := range ReplaceTests {
943 
                in := append([]byte(tt.in), ""...)
944 
                in = in[:len(tt.in)]
945 
                out := Replace(in, []byte(tt.old), []byte(tt.new), tt.n)
946 
                if s := string(out); s != tt.out {
947 
                        t.Errorf("Replace(%q, %q, %q, %d) = %q, want %q", tt.in, tt.old, tt.new, tt.n, s, tt.out)
948 
                }
949 
                if cap(in) == cap(out) && &in[:1][0] == &out[:1][0] {
950 
                        t.Errorf("Replace(%q, %q, %q, %d) didn't copy", tt.in, tt.old, tt.new, tt.n)
951 
                }
952 
        }
953 
}
954 
 
955 
type TitleTest struct {
956 
        in, out string
957 
}
958 
 
959 
var TitleTests = []TitleTest{
960 
        {"", ""},
961 
        {"a", "A"},
962 
        {" aaa aaa aaa ", " Aaa Aaa Aaa "},
963 
        {" Aaa Aaa Aaa ", " Aaa Aaa Aaa "},
964 
        {"123a456", "123a456"},
965 
        {"double-blind", "Double-Blind"},
966 
        {"ÿøû", "Ÿøû"},
967 
}
968 
 
969 
func TestTitle(t *testing.T) {
970 
        for _, tt := range TitleTests {
971 
                if s := string(Title([]byte(tt.in))); s != tt.out {
972 
                        t.Errorf("Title(%q) = %q, want %q", tt.in, s, tt.out)
973 
                }
974 
        }
975 
}
976 
 
977 
var EqualFoldTests = []struct {
978 
        s, t string
979 
        out  bool
980 
}{
981 
        {"abc", "abc", true},
982 
        {"ABcd", "ABcd", true},
983 
        {"123abc", "123ABC", true},
984 
        {"αβδ", "ΑΒΔ", true},
985 
        {"abc", "xyz", false},
986 
        {"abc", "XYZ", false},
987 
        {"abcdefghijk", "abcdefghijX", false},
988 
        {"abcdefghijk", "abcdefghij\u212A", true},
989 
        {"abcdefghijK", "abcdefghij\u212A", true},
990 
        {"abcdefghijkz", "abcdefghij\u212Ay", false},
991 
        {"abcdefghijKz", "abcdefghij\u212Ay", false},
992 
}
993 
 
994 
func TestEqualFold(t *testing.T) {
995 
        for _, tt := range EqualFoldTests {
996 
                if out := EqualFold([]byte(tt.s), []byte(tt.t)); out != tt.out {
997 
                        t.Errorf("EqualFold(%#q, %#q) = %v, want %v", tt.s, tt.t, out, tt.out)
998 
                }
999 
                if out := EqualFold([]byte(tt.t), []byte(tt.s)); out != tt.out {
1000 
                        t.Errorf("EqualFold(%#q, %#q) = %v, want %v", tt.t, tt.s, out, tt.out)
1001 
                }
1002 
        }
1003 
}

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