| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| package internal |
| |
| import ( |
| "testing" |
| "time" |
| |
| "github.com/stretchr/testify/assert" |
| ) |
| |
| func TestBackoff_NextMinValue(t *testing.T) { |
| backoff := &Backoff{} |
| delay := backoff.Next() |
| assert.GreaterOrEqual(t, int64(delay), int64(100*time.Millisecond)) |
| assert.LessOrEqual(t, int64(delay), int64(120*time.Millisecond)) |
| } |
| |
| func TestBackoff_NextExponentialBackoff(t *testing.T) { |
| backoff := &Backoff{} |
| previousDelay := backoff.Next() |
| // the last value before capping to the max value is 51.2 s (.1, .2, .4, .8, 1.6, 3.2, 6.4, 12.8, 25.6, 51.2) |
| for previousDelay < 51*time.Second { |
| delay := backoff.Next() |
| // the jitter introduces at most 20% difference so at least delay is 1.6=(1-0.2)*2 bigger |
| assert.GreaterOrEqual(t, int64(delay), int64(1.6*float64(previousDelay))) |
| // the jitter introduces at most 20% difference so delay is less than twice the previous value |
| assert.LessOrEqual(t, int64(float64(delay)*.8), int64(2*float64(previousDelay))) |
| previousDelay = delay |
| } |
| } |
| |
| func TestBackoff_NextMaxValue(t *testing.T) { |
| backoff := &Backoff{} |
| var delay time.Duration |
| for delay < maxBackoff { |
| delay = backoff.Next() |
| } |
| |
| cappedDelay := backoff.Next() |
| assert.GreaterOrEqual(t, int64(cappedDelay), int64(maxBackoff)) |
| // max value is 60 seconds + 20% jitter = 72 seconds |
| assert.LessOrEqual(t, int64(cappedDelay), int64(72*time.Second)) |
| } |