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// 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 (
"testing"
. "time"
)
func TestTicker(t *testing.T) {
const Count = 10
Delta := 100 * Millisecond
ticker := NewTicker(Delta)
t0 := Now()
for i := 0; i < Count; i++ {
<-ticker.C
}
ticker.Stop()
t1 := Now()
dt := t1.Sub(t0)
target := Delta * Count
slop := target * 2 / 10
if dt < target-slop || (!testing.Short() && dt > target+slop) {
t.Fatalf("%d %s ticks took %s, expected [%s,%s]", Count, Delta, dt, target-slop, target+slop)
}
// Now test that the ticker stopped
Sleep(2 * Delta)
select {
case <-ticker.C:
t.Fatal("Ticker did not shut down")
default:
// ok
}
}
// 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) {
ticker := NewTicker(1)
b.ResetTimer()
b.StartTimer()
for i := 0; i < b.N; i++ {
<-ticker.C
}
b.StopTimer()
ticker.Stop()
}
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