Imported Upstream version 60upstream/60

1 files changed, 58 insertions, 0 deletions

diff --git a/src/pkg/time/tick_test.go b/src/pkg/time/tick_test.go
new file mode 100644
index 000000000..4dcb63956
--- /dev/null
+++ b/src/pkg/time/tick_test.go
@@ -0,0 +1,58 @@
+// 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)
+	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()
+}