| // 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.Fatalf("Ticker did not shut down") |
| } |
| } |