async/pool_test.go at master · eleniums/async · GitHub

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
package async

import (
	"context"
	"errors"
	"testing"
	"time"

	assert "github.com/stretchr/testify/require"
)

func Test_TaskPool_NewTaskPool_Max1_Success(t *testing.T) {
	// act
	pool := NewTaskPool(1)

	// assert
	assert.Equal(t, 1, pool.max)
	assert.NotNil(t, pool.sem)
}

func Test_TaskPool_NewTaskPool_Max2_Success(t *testing.T) {
	// act
	pool := NewTaskPool(2)

	// assert
	assert.Equal(t, 2, pool.max)
	assert.NotNil(t, pool.sem)
}

func Test_TaskPool_NewTaskPool_Max0_Failure(t *testing.T) {
	var pool *TaskPool

	defer func() {
		recover()
		assert.Nil(t, pool)
	}()

	// act
	pool = NewTaskPool(0)

	// assert
	assert.True(t, false)
}

func Test_TaskPool_NewTaskPool_MaxNegative_Failure(t *testing.T) {
	var pool *TaskPool

	defer func() {
		recover()
		assert.Nil(t, pool)
	}()

	// act
	pool = NewTaskPool(-1)

	// assert
	assert.True(t, false)
}

func Test_TaskPool_Run_Success(t *testing.T) {
	// arrange
	startedTask1 := false
	finishedTask1 := false
	task1 := func() error {
		defer func() { finishedTask1 = true }()
		startedTask1 = true
		time.Sleep(time.Millisecond * 100)
		return nil
	}

	startedTask2 := false
	finishedTask2 := false
	task2 := func() error {
		defer func() { finishedTask2 = true }()
		startedTask2 = true
		time.Sleep(time.Millisecond * 200)
		return nil
	}

	started := make(chan bool, 1)
	defer close(started)

	startedTask3 := false
	finishedTask3 := false
	task3 := func() error {
		defer func() { finishedTask3 = true }()
		startedTask3 = true
		started <- true
		time.Sleep(time.Millisecond * 200)
		return nil
	}

	pool := NewTaskPool(2)

	// act
	errc := pool.Run(context.Background(), task1)
	assert.NotNil(t, errc)

	errc = pool.Run(context.Background(), task2)
	assert.NotNil(t, errc)

	errc = pool.Run(context.Background(), task3)
	assert.NotNil(t, errc)

	// assert
	<-started

	assert.True(t, startedTask1)
	assert.True(t, finishedTask1)

	assert.True(t, startedTask2)
	assert.False(t, finishedTask2)

	assert.True(t, startedTask3)
	assert.False(t, finishedTask3)
}

func Test_TaskPool_Run_Error(t *testing.T) {
	// arrange
	startedTask1 := false
	finishedTask1 := false
	task1 := func() error {
		defer func() { finishedTask1 = true }()
		startedTask1 = true
		time.Sleep(time.Millisecond * 100)
		return nil
	}

	startedTask2 := false
	finishedTask2 := false
	task2 := func() error {
		defer func() { finishedTask2 = true }()
		startedTask2 = true
		time.Sleep(time.Millisecond * 200)
		return errors.New("task 2 encountered an error")
	}

	pool := NewTaskPool(2)

	// act
	errc1 := pool.Run(context.Background(), task1)
	assert.NotNil(t, errc1)

	errc2 := pool.Run(context.Background(), task2)
	assert.NotNil(t, errc2)

	// assert
	err := <-errc1
	assert.NoError(t, err)
	assert.True(t, startedTask1)
	assert.True(t, finishedTask1)

	err = <-errc2
	assert.Error(t, err)
	assert.True(t, startedTask2)
	assert.True(t, finishedTask2)
}

func Test_TaskPool_Run_Cancel(t *testing.T) {
	// arrange
	started := make(chan bool, 1)
	defer close(started)

	startedTask1 := false
	finishedTask1 := false
	task1 := func() error {
		defer func() { finishedTask1 = true }()
		startedTask1 = true
		started <- true
		time.Sleep(time.Millisecond * 200)
		return nil
	}

	startedTask2 := false
	finishedTask2 := false
	task2 := func() error {
		defer func() { finishedTask2 = true }()
		startedTask2 = true
		time.Sleep(time.Millisecond * 200)
		return nil
	}

	pool := NewTaskPool(1)

	// act
	errc := pool.Run(context.Background(), task1)
	assert.NotNil(t, errc)

	ctx, cancel := context.WithCancel(context.Background())
	go func() {
		errc := pool.Run(ctx, task2)
		assert.NotNil(t, errc)
		err := <-errc
		assert.Error(t, err)
	}()
	cancel()

	// assert
	<-started

	assert.True(t, startedTask1)
	assert.False(t, finishedTask1)

	assert.False(t, startedTask2)
	assert.False(t, finishedTask2)
}

func Test_TaskPool_Wait_Success(t *testing.T) {
	// arrange
	startedTask1 := false
	finishedTask1 := false
	task1 := func() error {
		defer func() { finishedTask1 = true }()
		startedTask1 = true
		time.Sleep(time.Millisecond * 200)
		return nil
	}

	startedTask2 := false
	finishedTask2 := false
	task2 := func() error {
		defer func() { finishedTask2 = true }()
		startedTask2 = true
		time.Sleep(time.Millisecond * 200)
		return nil
	}

	pool := NewTaskPool(2)

	errc := pool.Run(context.Background(), task1)
	assert.NotNil(t, errc)

	errc = pool.Run(context.Background(), task2)
	assert.NotNil(t, errc)

	// act
	err := pool.Wait()

	// assert
	assert.NoError(t, err)

	assert.True(t, startedTask1)
	assert.True(t, finishedTask1)

	assert.True(t, startedTask2)
	assert.True(t, finishedTask2)
}