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
|
package backoff
import (
"reflect"
"testing"
"time"
)
func Test1(t *testing.T) {
b := &Backoff{
Min: 100 * time.Millisecond,
Max: 10 * time.Second,
Factor: 2,
}
equals(t, b.Duration(), 100*time.Millisecond)
equals(t, b.Duration(), 200*time.Millisecond)
equals(t, b.Duration(), 400*time.Millisecond)
b.Reset()
equals(t, b.Duration(), 100*time.Millisecond)
}
func TestForAttempt(t *testing.T) {
b := &Backoff{
Min: 100 * time.Millisecond,
Max: 10 * time.Second,
Factor: 2,
}
equals(t, b.ForAttempt(0), 100*time.Millisecond)
equals(t, b.ForAttempt(1), 200*time.Millisecond)
equals(t, b.ForAttempt(2), 400*time.Millisecond)
b.Reset()
equals(t, b.ForAttempt(0), 100*time.Millisecond)
}
func Test2(t *testing.T) {
b := &Backoff{
Min: 100 * time.Millisecond,
Max: 10 * time.Second,
Factor: 1.5,
}
equals(t, b.Duration(), 100*time.Millisecond)
equals(t, b.Duration(), 150*time.Millisecond)
equals(t, b.Duration(), 225*time.Millisecond)
b.Reset()
equals(t, b.Duration(), 100*time.Millisecond)
}
func Test3(t *testing.T) {
b := &Backoff{
Min: 100 * time.Nanosecond,
Max: 10 * time.Second,
Factor: 1.75,
}
equals(t, b.Duration(), 100*time.Nanosecond)
equals(t, b.Duration(), 175*time.Nanosecond)
equals(t, b.Duration(), 306*time.Nanosecond)
b.Reset()
equals(t, b.Duration(), 100*time.Nanosecond)
}
func Test4(t *testing.T) {
b := &Backoff{
Min: 500 * time.Second,
Max: 100 * time.Second,
Factor: 1,
}
equals(t, b.Duration(), b.Max)
}
func TestGetAttempt(t *testing.T) {
b := &Backoff{
Min: 100 * time.Millisecond,
Max: 10 * time.Second,
Factor: 2,
}
equals(t, b.Attempt(), float64(0))
equals(t, b.Duration(), 100*time.Millisecond)
equals(t, b.Attempt(), float64(1))
equals(t, b.Duration(), 200*time.Millisecond)
equals(t, b.Attempt(), float64(2))
equals(t, b.Duration(), 400*time.Millisecond)
equals(t, b.Attempt(), float64(3))
b.Reset()
equals(t, b.Attempt(), float64(0))
equals(t, b.Duration(), 100*time.Millisecond)
equals(t, b.Attempt(), float64(1))
}
func TestJitter(t *testing.T) {
b := &Backoff{
Min: 100 * time.Millisecond,
Max: 10 * time.Second,
Factor: 2,
Jitter: true,
}
equals(t, b.Duration(), 100*time.Millisecond)
between(t, b.Duration(), 100*time.Millisecond, 200*time.Millisecond)
between(t, b.Duration(), 100*time.Millisecond, 400*time.Millisecond)
b.Reset()
equals(t, b.Duration(), 100*time.Millisecond)
}
func between(t *testing.T, actual, low, high time.Duration) {
if actual < low {
t.Fatalf("Got %s, Expecting >= %s", actual, low)
}
if actual > high {
t.Fatalf("Got %s, Expecting <= %s", actual, high)
}
}
func equals(t *testing.T, v1, v2 interface{}) {
if !reflect.DeepEqual(v1, v2) {
t.Fatalf("Got %v, Expecting %v", v1, v2)
}
}
|
