-
Notifications
You must be signed in to change notification settings - Fork 0
/
trie_test.go
424 lines (366 loc) · 7.87 KB
/
trie_test.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
// Copyright 2019 Pavel Knoblokh. All rights reserved.
// Use of this source code is governed by MIT License
// that can be found in the LICENSE file.
// The fixtures data was kindly borrowed and sampled
// from /usr/share/dict/web2 on MacOS and,
// according to their README, is copyright free.
package trie
import (
"bufio"
"compress/bzip2"
"log"
"os"
"reflect"
"testing"
)
var testData = []struct {
Key string
Value interface{}
}{
{"foo", 11},
{"foobar", 111},
{"bar", 22},
}
var benchData []string
func init() {
file, err := os.Open("fixtures/words.bz2")
if err != nil {
log.Fatal(err)
}
defer file.Close()
scanner := bufio.NewScanner(bzip2.NewReader(file))
for scanner.Scan() {
benchData = append(benchData, scanner.Text())
}
if err := scanner.Err(); err != nil {
log.Fatal(err)
}
}
// PrefixMap searches for prefixes in a map,
// ignoring thread-safety for simplicity
type PrefixMap map[string]interface{}
func (m PrefixMap) WithPrefix(prefix string) map[string]interface{} {
results := make(map[string]interface{})
prefixLen := len(prefix)
for key, value := range m {
if len(key) >= prefixLen {
k := key[:prefixLen]
if k == prefix {
results[key] = value
}
}
}
return results
}
func getTestTrie() *Trie {
trie := NewTrie()
for _, item := range testData {
trie.Insert(item.Key, item.Value)
}
return trie
}
func getTestPrefixMap() PrefixMap {
m := make(PrefixMap)
for _, item := range testData {
m[item.Key] = item.Value
}
return m
}
func TestMapWithPrefix(t *testing.T) {
tests := []struct {
key string
want map[string]interface{}
}{
{"f", map[string]interface{}{
"foo": 11,
"foobar": 111,
}},
{"foo", map[string]interface{}{
"foo": 11,
"foobar": 111,
}},
{"foob", map[string]interface{}{
"foobar": 111,
}},
{"ba", map[string]interface{}{
"bar": 22,
}},
{"xyz", map[string]interface{}{}},
}
m := getTestPrefixMap()
for _, test := range tests {
value := m.WithPrefix(test.key)
if !reflect.DeepEqual(value, test.want) {
t.Errorf("Invalid Map prefix values: expected %v, got %v", test.want, value)
}
}
}
func TestNewTrie(t *testing.T) {
var trie interface{} = NewTrie()
_, ok := trie.(*Trie)
if !ok {
t.Errorf("Invalid trie type")
}
}
func TestEdgeCases(t *testing.T) {
trie := NewTrie()
res := trie.Search("xyz")
if res != nil {
t.Errorf("Search in empty trie must return nil")
}
ok := trie.Delete("xyz")
if ok {
t.Errorf("Delete in empty trie must fail")
}
res = trie.Search("")
if res != nil {
t.Errorf("Empty key in empty trie must return nil")
}
trie.Insert("", 1234)
res = trie.Search("")
if res != 1234 {
t.Errorf("Root node must also be able to store data")
}
want := map[string]interface{}{
"": 1234,
"xyz": "xyz",
}
trie.Insert("xyz", "xyz")
got := trie.WithPrefix("")
if !reflect.DeepEqual(got, want) {
t.Errorf("WithPrefix must include root node data if available")
}
}
func TestInsertAndSearch(t *testing.T) {
tests := []struct {
key string
want interface{}
}{
{"foo", 11},
{"foobar", 111},
{"bar", 22},
{"foob", nil},
{"foobarr", nil},
}
trie := getTestTrie()
for _, test := range tests {
value := trie.Search(test.key)
if value != test.want {
t.Errorf("Invalid value: expected %v, got %v", test.want, value)
}
}
}
func TestDelete(t *testing.T) {
tests := []struct {
key string
want interface{}
}{
{"foo", 11},
{"bar", 22},
{"foobar", nil},
{"fooba", nil},
{"foob", nil},
}
trie := getTestTrie()
ok := trie.Delete("foob")
if ok {
t.Errorf("Deleting unexisting key must return nil")
}
ok = trie.Delete("foobar")
if !ok {
t.Errorf("Deleting existing key must not return nil")
}
for _, test := range tests {
value := trie.Search(test.key)
if value != test.want {
t.Errorf("Invalid value: expected %v, got %v", test.want, value)
}
}
}
func TestWithPrefix(t *testing.T) {
tests := []struct {
key string
want map[string]interface{}
}{
{"f", map[string]interface{}{
"foo": 11,
"foobar": 111,
}},
{"foo", map[string]interface{}{
"foo": 11,
"foobar": 111,
}},
{"foob", map[string]interface{}{
"foobar": 111,
}},
{"ba", map[string]interface{}{
"bar": 22,
}},
{"xyz", map[string]interface{}{}},
}
trie := getTestTrie()
for _, test := range tests {
value := trie.WithPrefix(test.key)
if !reflect.DeepEqual(value, test.want) {
t.Errorf("Invalid prefix values: expected %v, got %v", test.want, value)
}
}
}
func TestCounters(t *testing.T) {
tests := []struct {
wantLen int
wantNodeNum int
}{
{1, 3 + 1}, // +1 includes the root node
{2, 6 + 1},
{3, 9 + 1},
}
trie := NewTrie()
for i, item := range testData {
trie.Insert(item.Key, item.Value)
if trie.Len() != tests[i].wantLen {
t.Errorf("Invalid trie length: expected %v, got %v", tests[i].wantLen, trie.Len())
}
if trie.NodeNum() != tests[i].wantNodeNum {
t.Errorf("Invalid trie node number: expected %v, got %v", tests[i].wantNodeNum, trie.NodeNum())
}
}
}
func getBenchTrie() *Trie {
trie := NewTrie()
for _, key := range benchData {
trie.Insert(key, struct{}{})
}
return trie
}
func getBenchPrefixMap() PrefixMap {
m := make(PrefixMap)
for _, key := range benchData {
m[key] = struct{}{}
}
return m
}
func BenchmarkWithPrefixTrie(b *testing.B) {
b.ReportAllocs()
trie := getBenchTrie()
length := len(benchData)
b.ResetTimer()
for i := 0; i < b.N; i++ {
_ = trie.WithPrefix(benchData[i%length])
}
}
func BenchmarkWithPrefixMap(b *testing.B) {
b.ReportAllocs()
m := getBenchPrefixMap()
length := len(benchData)
b.ResetTimer()
for i := 0; i < b.N; i++ {
_ = m.WithPrefix(benchData[i%length])
}
}
func BenchmarkInsertTrie(b *testing.B) {
b.ReportAllocs()
trie := NewTrie()
length := len(benchData)
b.ResetTimer()
for i := 0; i < b.N; i++ {
trie.Insert(benchData[i%length], struct{}{})
}
}
func BenchmarkInsertMap(b *testing.B) {
b.ReportAllocs()
m := make(map[string]interface{})
length := len(benchData)
b.ResetTimer()
for i := 0; i < b.N; i++ {
m[benchData[i%length]] = struct{}{}
}
}
func BenchmarkSearchTrie(b *testing.B) {
b.ReportAllocs()
trie := getBenchTrie()
length := len(benchData)
b.ResetTimer()
for i := 0; i < b.N; i++ {
_ = trie.Search(benchData[i%length])
}
}
func BenchmarkSearchMap(b *testing.B) {
b.ReportAllocs()
m := getBenchPrefixMap()
length := len(benchData)
b.ResetTimer()
for i := 0; i < b.N; i++ {
_ = m[benchData[i%length]]
}
}
func BenchmarkDeleteTrie(b *testing.B) {
b.ReportAllocs()
trie := getBenchTrie()
length := len(benchData)
b.ResetTimer()
for i := 0; i < b.N; i++ {
trie.Delete(benchData[i%length])
}
}
func BenchmarkDeleteMap(b *testing.B) {
b.ReportAllocs()
m := getBenchPrefixMap()
length := len(benchData)
b.ResetTimer()
for i := 0; i < b.N; i++ {
delete(m, benchData[i%length])
}
}
func BenchmarkSearchWhileInsert(b *testing.B) {
b.ReportAllocs()
trie := getBenchTrie()
length := len(benchData)
b.ResetTimer()
for i := 0; i < b.N; i++ {
key := benchData[i%length]
go trie.Insert(key, struct{}{})
trie.Search(key)
}
}
func BenchmarkInsertWhileSearch(b *testing.B) {
b.ReportAllocs()
trie := getBenchTrie()
length := len(benchData)
b.ResetTimer()
for i := 0; i < b.N; i++ {
key := benchData[i%length]
go trie.Search(key)
trie.Insert(key, struct{}{})
}
}
func BenchmarkSearchWhileInsertParallel(b *testing.B) {
b.ReportAllocs()
trie := getBenchTrie()
length := len(benchData)
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
i := 0
for pb.Next() {
key := benchData[i%length]
go trie.Insert(key, struct{}{})
trie.Search(key)
i++
}
})
}
func BenchmarkInsertWhileSearchParallel(b *testing.B) {
b.ReportAllocs()
trie := getBenchTrie()
length := len(benchData)
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
i := 0
for pb.Next() {
key := benchData[i%length]
go trie.Search(key)
trie.Insert(key, struct{}{})
i++
}
})
}