forked from carlescere/goback
/
goback_test.go
117 lines (107 loc) · 2.77 KB
/
goback_test.go
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package goback
import (
"fmt"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
func TestAfter(t *testing.T) {
b := &SimpleBackoff{
Factor: 2,
Min: 100 * time.Millisecond,
Max: 2 * time.Second,
MaxAttempts: 1,
}
var t1, t2, t3 time.Time
var err1, err2 error
t1 = time.Now()
select {
case err1 = <-After(b):
t2 = time.Now()
case <-time.After(101 * time.Millisecond):
t.Error("Not executed on time")
}
select {
case err2 = <-After(b):
case <-time.After(time.Millisecond):
t.Error("Not executed on time")
}
t3 = time.Now()
assert.WithinDuration(t, t1.Add(100*time.Millisecond), t2, time.Millisecond)
assert.WithinDuration(t, t2, t3, time.Millisecond)
assert.Nil(t, err1)
assert.NotNil(t, err2)
}
func TestWait(t *testing.T) {
b := &SimpleBackoff{
Factor: 2,
Min: 100 * time.Millisecond,
Max: 2 * time.Second,
MaxAttempts: 1,
}
t1 := time.Now()
err1 := Wait(b)
t2 := time.Now()
err2 := Wait(b)
t3 := time.Now()
assert.WithinDuration(t, t1.Add(100*time.Millisecond), t2, time.Millisecond)
assert.WithinDuration(t, t2, t3, time.Millisecond)
assert.Nil(t, err1)
assert.NotNil(t, err2)
}
func TestSimple(t *testing.T) {
b := &SimpleBackoff{
Factor: 2,
Min: 100 * time.Millisecond,
Max: 2 * time.Second,
MaxAttempts: 6,
}
next, err := b.NextAttempt()
assert.Equal(t, 100*time.Millisecond, next)
assert.Nil(t, err)
next, err = b.NextAttempt()
assert.Equal(t, 200*time.Millisecond, next)
assert.Nil(t, err)
next, err = b.NextAttempt()
assert.Equal(t, 400*time.Millisecond, next)
assert.Nil(t, err)
next, err = b.NextAttempt()
assert.Equal(t, 800*time.Millisecond, next)
assert.Nil(t, err)
next, err = b.NextAttempt()
assert.Equal(t, 1600*time.Millisecond, next)
assert.Nil(t, err)
next, err = b.NextAttempt()
assert.Equal(t, 2*time.Second, next)
assert.Nil(t, err)
next, err = b.NextAttempt()
assert.NotNil(t, err)
b.Reset()
next, err = b.NextAttempt()
assert.Equal(t, 100*time.Millisecond, next)
assert.Nil(t, err)
}
func TestJitter(t *testing.T) {
min := 100 * time.Millisecond
b := &JitterBackoff{
Factor: 2,
Min: min,
Max: 10 * time.Second,
MaxAttempts: 3,
}
next, err := b.NextAttempt()
between(t, next, 100*time.Millisecond, min)
assert.Nil(t, err)
next, err = b.NextAttempt()
between(t, next, 200*time.Millisecond, min)
assert.Nil(t, err)
next, err = b.NextAttempt()
between(t, next, 400*time.Millisecond, min)
assert.Nil(t, err)
next, err = b.NextAttempt()
assert.NotNil(t, err)
}
func between(t *testing.T, next, expected, offset time.Duration) {
assert.True(t, next >= expected-offset, fmt.Sprintf("%v %v %v", next, expected, offset))
assert.True(t, next <= expected+offset, fmt.Sprintf("%v %v %v", next, expected, offset))
}