// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package time_test
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import (
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"testing"
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. "time"
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)
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func TestTicker(t *testing.T) {
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const Count = 10
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Delta := 100 * Millisecond
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ticker := NewTicker(Delta)
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t0 := Now()
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for i := 0; i < Count; i++ {
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<-ticker.C
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}
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ticker.Stop()
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t1 := Now()
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dt := t1.Sub(t0)
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target := Delta * Count
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slop := target * 2 / 10
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if dt < target-slop || (!testing.Short() && dt > target+slop) {
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t.Fatalf("%d %s ticks took %s, expected [%s,%s]", Count, Delta, dt, target-slop, target+slop)
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}
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// Now test that the ticker stopped
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Sleep(2 * Delta)
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select {
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case <-ticker.C:
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t.Fatal("Ticker did not shut down")
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default:
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// ok
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}
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}
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// Issue 21874
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func TestTickerStopWithDirectInitialization(t *testing.T) {
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c := make(chan Time)
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tk := &Ticker{C: c}
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tk.Stop()
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}
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// Test that a bug tearing down a ticker has been fixed. This routine should not deadlock.
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func TestTeardown(t *testing.T) {
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Delta := 100 * Millisecond
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if testing.Short() {
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Delta = 20 * Millisecond
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}
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for i := 0; i < 3; i++ {
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ticker := NewTicker(Delta)
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<-ticker.C
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ticker.Stop()
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}
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}
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// Test the Tick convenience wrapper.
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func TestTick(t *testing.T) {
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// Test that giving a negative duration returns nil.
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if got := Tick(-1); got != nil {
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t.Errorf("Tick(-1) = %v; want nil", got)
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}
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}
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// Test that NewTicker panics when given a duration less than zero.
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func TestNewTickerLtZeroDuration(t *testing.T) {
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defer func() {
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if err := recover(); err == nil {
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t.Errorf("NewTicker(-1) should have panicked")
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}
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}()
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NewTicker(-1)
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}
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func BenchmarkTicker(b *testing.B) {
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benchmark(b, func(n int) {
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ticker := NewTicker(Nanosecond)
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for i := 0; i < n; i++ {
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<-ticker.C
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}
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ticker.Stop()
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})
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}
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