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// Copyright (c) The go-grpc-middleware Authors.
// Licensed under the Apache License 2.0.
package backoffutils_test
import (
"testing"
"time"
"github.com/grpc-ecosystem/go-grpc-middleware/v2/util/backoffutils"
"github.com/stretchr/testify/assert"
)
// scale duration by a factor
func scaleDuration(d time.Duration, factor float64) time.Duration {
return time.Duration(float64(d) * factor)
}
func TestJitterUp(t *testing.T) {
// arguments to jitterup
duration := 10 * time.Second
variance := 0.10
// bound to check
max := 11000 * time.Millisecond
min := 9000 * time.Millisecond
high := scaleDuration(max, 0.98)
low := scaleDuration(min, 1.02)
highCount := 0
lowCount := 0
for i := 0; i < 1000; i++ {
out := backoffutils.JitterUp(duration, variance)
assert.True(t, out <= max, "value %s must be <= %s", out, max)
assert.True(t, out >= min, "value %s must be >= %s", out, min)
if out > high {
highCount++
}
if out < low {
lowCount++
}
}
assert.True(t, highCount != 0, "at least one sample should reach to >%s", high)
assert.True(t, lowCount != 0, "at least one sample should to <%s", low)
}
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