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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 * Millisecond

                Count = 10

        )

        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 || 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) {

        for i := 0; i < 3; i++ {

                ticker := NewTicker(1e8)

                <-ticker.C

                ticker.Stop()

        }

}

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()

}