81 lines
2.0 KiB
Go
81 lines
2.0 KiB
Go
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"testing"
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"time"
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)
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type FakeTime struct {
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timeseries []int
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lastIndex int
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durationUnit time.Duration
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}
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func (f *FakeTime) GetTime() time.Time {
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timeDelta := time.Duration(f.timeseries[f.lastIndex]) * f.durationUnit
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fakeTime := time.Unix(0, 0).Add(timeDelta)
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f.lastIndex++
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return fakeTime
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}
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func FakeJitter(input int) int {
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return input
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}
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func RunBackoffTest(t *testing.T,
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maxBackoff float64, resetDelta float64,
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elapsedTime []int, expectedDelays []int) {
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fakeTime := &FakeTime{
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timeseries: elapsedTime,
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lastIndex: 0,
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durationUnit: time.Millisecond,
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}
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backoff := NewBackoffForTesting(maxBackoff, resetDelta, time.Millisecond,
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FakeJitter, fakeTime.GetTime)
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for i, value := range expectedDelays {
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expected_delay := time.Duration(value) * time.Millisecond
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delay := backoff.GetDelay()
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if expected_delay != delay {
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t.Errorf("Call #%d of GetDelay returned %s (expected %s)",
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i, delay, expected_delay)
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}
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}
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}
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func TestBackoffIncreasesAndReachesMax(t *testing.T) {
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RunBackoffTest(t,
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8,
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32,
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// Simple sequential time
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[]int{0, 0, 1, 2, 3, 4, 5, 6, 7},
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// Exponential ramp-up to max, then keep max.
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[]int{0, 2, 4, 8, 8, 8, 8, 8},
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)
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}
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func TestBackoffReset(t *testing.T) {
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RunBackoffTest(t,
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8,
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32,
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// Simulate two intervals bigger than resetDelta
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[]int{0, 0, 1, 2, 50, 51, 100, 101, 102},
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// Delays get reset each time
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[]int{0, 2, 4, 0, 2, 0, 2, 4},
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)
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}
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