libgo/go/time/tick_test.go

   1 // Copyright 2009 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package time_test
   6
   7 import (
   8         "testing"
   9         . "time"
  10 )
  11
  12 func TestTicker(t *testing.T) {
  13         const (
  14                 Delta = 100 * 1e6
  15                 Count = 10
  16         )
  17         ticker := NewTicker(Delta)
  18         t0 := Nanoseconds()
  19         for i := 0; i < Count; i++ {
  20                 <-ticker.C
  21         }
  22         ticker.Stop()
  23         t1 := Nanoseconds()
  24         ns := t1 - t0
  25         target := int64(Delta * Count)
  26         slop := target * 2 / 10
  27         if ns < target-slop || ns > target+slop {
  28                 t.Fatalf("%d ticks of %g ns took %g ns, expected %g", Count, float64(Delta), float64(ns), float64(target))
  29         }
  30         // Now test that the ticker stopped
  31         Sleep(2 * Delta)
  32         _, received := <-ticker.C
  33         if received {
  34                 t.Fatalf("Ticker did not shut down")
  35         }
  36 }
  37
  38 // Test that a bug tearing down a ticker has been fixed.  This routine should not deadlock.
  39 func TestTeardown(t *testing.T) {
  40         for i := 0; i < 3; i++ {
  41                 ticker := NewTicker(1e8)
  42                 <-ticker.C
  43                 ticker.Stop()
  44         }
  45 }