118 lines
3.2 KiB
Go
118 lines
3.2 KiB
Go
// Copyright 2017 Google Inc. All Rights Reserved.
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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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// http://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 jsonclient
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import (
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"math"
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"testing"
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"time"
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)
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const testLeeway = 25 * time.Microsecond
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func fuzzyTimeEquals(a, b time.Time, leeway time.Duration) bool {
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diff := math.Abs(float64(a.Sub(b).Nanoseconds()))
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if diff < float64(leeway.Nanoseconds()) {
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return true
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}
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return false
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}
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func fuzzyDurationEquals(a, b time.Duration, leeway time.Duration) bool {
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diff := math.Abs(float64(a.Nanoseconds() - b.Nanoseconds()))
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if diff < float64(leeway.Nanoseconds()) {
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return true
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}
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return false
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}
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func TestBackoff(t *testing.T) {
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b := backoff{}
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// Test that the interval increases as expected
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for i := uint(0); i < maxMultiplier; i++ {
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n := time.Now()
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interval := b.set(nil)
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if interval != time.Second*(1<<i) {
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t.Fatalf("backoff.set(nil)=%v; want %v", interval, time.Second*(1<<i))
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}
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expected := n.Add(interval)
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until := b.until()
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if !fuzzyTimeEquals(expected, until, time.Millisecond) {
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t.Fatalf("backoff.until()=%v; want %v (+ 0-250ms)", expected, until)
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}
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// reset notBefore
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b.notBefore = time.Time{}
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}
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// Test that multiplier doesn't go above maxMultiplier
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b.multiplier = maxMultiplier
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b.notBefore = time.Time{}
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interval := b.set(nil)
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if b.multiplier > maxMultiplier {
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t.Fatalf("backoff.multiplier=%v; want %v", b.multiplier, maxMultiplier)
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}
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if interval > time.Second*(1<<(maxMultiplier-1)) {
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t.Fatalf("backoff.set(nil)=%v; want %v", interval, 1<<(maxMultiplier-1)*time.Second)
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}
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// Test decreaseMultiplier properly decreases the multiplier
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b.multiplier = 1
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b.notBefore = time.Time{}
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b.decreaseMultiplier()
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if b.multiplier != 0 {
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t.Fatalf("backoff.multiplier=%v; want %v", b.multiplier, 0)
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}
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// Test decreaseMultiplier doesn't reduce multiplier below 0
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b.decreaseMultiplier()
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if b.multiplier != 0 {
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t.Fatalf("backoff.multiplier=%v; want %v", b.multiplier, 0)
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}
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}
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func TestBackoffOverride(t *testing.T) {
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b := backoff{}
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for _, tc := range []struct {
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notBefore time.Time
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override time.Duration
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expectedInterval time.Duration
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}{
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{
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notBefore: time.Now().Add(time.Hour),
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override: time.Second * 1800,
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expectedInterval: time.Hour,
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},
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{
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notBefore: time.Now().Add(time.Hour),
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override: time.Second * 7200,
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expectedInterval: 2 * time.Hour,
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},
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{
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notBefore: time.Time{},
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override: time.Second * 7200,
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expectedInterval: 2 * time.Hour,
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},
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} {
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b.multiplier = 0
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b.notBefore = tc.notBefore
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interval := b.set(&tc.override)
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if !fuzzyDurationEquals(tc.expectedInterval, interval, testLeeway) {
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t.Fatalf("backoff.set(%v)=%v; want %v", tc.override, interval, tc.expectedInterval)
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}
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}
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}
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