156 lines
3.5 KiB
Go
156 lines
3.5 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package time_test
|
|
|
|
import (
|
|
"fmt"
|
|
"runtime"
|
|
"testing"
|
|
. "time"
|
|
)
|
|
|
|
func TestTicker(t *testing.T) {
|
|
// We want to test that a ticker takes as much time as expected.
|
|
// Since we don't want the test to run for too long, we don't
|
|
// want to use lengthy times. This makes the test inherently flaky.
|
|
// So only report an error if it fails five times in a row.
|
|
|
|
count := 10
|
|
delta := 20 * Millisecond
|
|
|
|
// On Darwin ARM64 the tick frequency seems limited. Issue 35692.
|
|
if (runtime.GOOS == "darwin" || runtime.GOOS == "ios") && runtime.GOARCH == "arm64" {
|
|
// The following test will run ticker count/2 times then reset
|
|
// the ticker to double the duration for the rest of count/2.
|
|
// Since tick frequency is limited on Darwin ARM64, use even
|
|
// number to give the ticks more time to let the test pass.
|
|
// See CL 220638.
|
|
count = 6
|
|
delta = 100 * Millisecond
|
|
}
|
|
|
|
var errs []string
|
|
logErrs := func() {
|
|
for _, e := range errs {
|
|
t.Log(e)
|
|
}
|
|
}
|
|
|
|
for i := 0; i < 5; i++ {
|
|
ticker := NewTicker(delta)
|
|
t0 := Now()
|
|
for i := 0; i < count/2; i++ {
|
|
<-ticker.C
|
|
}
|
|
ticker.Reset(delta * 2)
|
|
for i := count / 2; i < count; i++ {
|
|
<-ticker.C
|
|
}
|
|
ticker.Stop()
|
|
t1 := Now()
|
|
dt := t1.Sub(t0)
|
|
target := 3 * delta * Duration(count/2)
|
|
slop := target * 3 / 10
|
|
if dt < target-slop || dt > target+slop {
|
|
errs = append(errs, fmt.Sprintf("%d %s ticks then %d %s ticks took %s, expected [%s,%s]", count/2, delta, count/2, delta*2, dt, target-slop, target+slop))
|
|
if dt > target+slop {
|
|
// System may be overloaded; sleep a bit
|
|
// in the hopes it will recover.
|
|
Sleep(Second / 2)
|
|
}
|
|
continue
|
|
}
|
|
// Now test that the ticker stopped.
|
|
Sleep(2 * delta)
|
|
select {
|
|
case <-ticker.C:
|
|
errs = append(errs, "Ticker did not shut down")
|
|
continue
|
|
default:
|
|
// ok
|
|
}
|
|
|
|
// Test passed, so all done.
|
|
if len(errs) > 0 {
|
|
t.Logf("saw %d errors, ignoring to avoid flakiness", len(errs))
|
|
logErrs()
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
t.Errorf("saw %d errors", len(errs))
|
|
logErrs()
|
|
}
|
|
|
|
// Issue 21874
|
|
func TestTickerStopWithDirectInitialization(t *testing.T) {
|
|
c := make(chan Time)
|
|
tk := &Ticker{C: c}
|
|
tk.Stop()
|
|
}
|
|
|
|
// Test that a bug tearing down a ticker has been fixed. This routine should not deadlock.
|
|
func TestTeardown(t *testing.T) {
|
|
Delta := 100 * Millisecond
|
|
if testing.Short() {
|
|
Delta = 20 * Millisecond
|
|
}
|
|
for i := 0; i < 3; i++ {
|
|
ticker := NewTicker(Delta)
|
|
<-ticker.C
|
|
ticker.Stop()
|
|
}
|
|
}
|
|
|
|
// Test the Tick convenience wrapper.
|
|
func TestTick(t *testing.T) {
|
|
// Test that giving a negative duration returns nil.
|
|
if got := Tick(-1); got != nil {
|
|
t.Errorf("Tick(-1) = %v; want nil", got)
|
|
}
|
|
}
|
|
|
|
// Test that NewTicker panics when given a duration less than zero.
|
|
func TestNewTickerLtZeroDuration(t *testing.T) {
|
|
defer func() {
|
|
if err := recover(); err == nil {
|
|
t.Errorf("NewTicker(-1) should have panicked")
|
|
}
|
|
}()
|
|
NewTicker(-1)
|
|
}
|
|
|
|
func BenchmarkTicker(b *testing.B) {
|
|
benchmark(b, func(n int) {
|
|
ticker := NewTicker(Nanosecond)
|
|
for i := 0; i < n; i++ {
|
|
<-ticker.C
|
|
}
|
|
ticker.Stop()
|
|
})
|
|
}
|
|
|
|
func BenchmarkTickerReset(b *testing.B) {
|
|
benchmark(b, func(n int) {
|
|
ticker := NewTicker(Nanosecond)
|
|
for i := 0; i < n; i++ {
|
|
ticker.Reset(Nanosecond * 2)
|
|
}
|
|
ticker.Stop()
|
|
})
|
|
}
|
|
|
|
func BenchmarkTickerResetNaive(b *testing.B) {
|
|
benchmark(b, func(n int) {
|
|
ticker := NewTicker(Nanosecond)
|
|
for i := 0; i < n; i++ {
|
|
ticker.Stop()
|
|
ticker = NewTicker(Nanosecond * 2)
|
|
}
|
|
ticker.Stop()
|
|
})
|
|
}
|