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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 (
Delta = 100 * 1e6
Count = 10
)
ticker := NewTicker(Delta)
t0 := Nanoseconds()
for i := 0; i < Count; i++ {
<-ticker.C
}
ticker.Stop()
t1 := Nanoseconds()
ns := t1 - t0
target := int64(Delta * Count)
slop := target * 2 / 10
if ns < target-slop || ns > target+slop {
t.Fatalf("%d ticks of %g ns took %g ns, expected %g", Count, float64(Delta), float64(ns), float64(target))
}
// Now test that the ticker stopped
Sleep(2 * Delta)
_, received := <-ticker.C
if received {
t.Fatal("Ticker did not shut down")
}
}
// Test that a bug tearing down a ticker has been fixed. This routine should not deadlock.
func TestTeardown(t *testing.T) {
for i := 0; i < 3; i++ {
ticker := NewTicker(1e8)
<-ticker.C
ticker.Stop()
}
}
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