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package retry
import (
"math"
"testing"
"time"
"github.com/aws/aws-sdk-go-v2/internal/timeconv"
)
func TestExponentialJitterBackoff_AttemptDelay(t *testing.T) {
maxB := 1 - 1/float64(1<<53)
cases := map[string]struct {
MaxBackoff time.Duration
RandFloat func() (float64, error)
Attempt int
Expect time.Duration
}{
"min delay floor": {
MaxBackoff: 20 * time.Second,
RandFloat: func() (float64, error) { return 0, nil },
Attempt: 1,
Expect: 0,
},
"min delay ceiling": {
MaxBackoff: 20 * time.Second,
RandFloat: func() (float64, error) { return maxB, nil },
Attempt: 1,
Expect: timeconv.FloatSecondsDur(maxB * float64(2)),
},
"attempt delay": {
MaxBackoff: 20 * time.Second,
RandFloat: func() (float64, error) { return 0.5, nil },
Attempt: 2,
Expect: timeconv.FloatSecondsDur(0.5 * float64(1<<2)),
},
"max delay": {
MaxBackoff: 20 * time.Second,
RandFloat: func() (float64, error) { return maxB, nil },
Attempt: 2147483647,
Expect: timeconv.FloatSecondsDur(maxB * math.Exp2(math.Log2(20))),
},
}
for name, c := range cases {
t.Run(name, func(t *testing.T) {
j := NewExponentialJitterBackoff(c.MaxBackoff)
j.randFloat64 = c.RandFloat
d, err := j.BackoffDelay(c.Attempt, nil)
if err != nil {
t.Fatalf("expect not error, %v", err)
}
if e, a := c.Expect, d; e != a {
t.Errorf("expect %v delay, got %v", e, a)
}
})
}
}
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