From: Ian Lance Taylor <iant@golang.org>
Date: Tue, 27 Apr 2021 00:49:28 +0000 (-0700)
Subject: time: increase slop for TestTicker
X-Git-Tag: go1.17beta1~413
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=13e87cda00;p=gostls13.git

time: increase slop for TestTicker

Also sleep a bit each time it fails, in case the system is overloaded.

Fixes #37332

Change-Id: Iabf3d0a27b5834c1e2a87c826b6206146b4f62c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/313849
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
---

diff --git a/src/time/tick_test.go b/src/time/tick_test.go
index 9a1cdf9ab2..b5d0a189bc 100644
--- a/src/time/tick_test.go
+++ b/src/time/tick_test.go
@@ -52,9 +52,14 @@ func TestTicker(t *testing.T) {
 		t1 := Now()
 		dt := t1.Sub(t0)
 		target := 3 * delta * Duration(count/2)
-		slop := target * 2 / 10
+		slop := target * 3 / 10
 		if dt < target-slop || dt > target+slop {
-			errs = append(errs, fmt.Sprintf("%d %s ticks took %s, expected [%s,%s]", count, delta, dt, target-slop, target+slop))
+			errs = append(errs, fmt.Sprintf("%d %s ticks then %d %s ticks took %s, expected [%s,%s]", count/2, delta, count/2, delta*2, dt, target-slop, target+slop))
+			if dt > target+slop {
+				// System may be overloaded; sleep a bit
+				// in the hopes it will recover.
+				Sleep(Second / 2)
+			}
 			continue
 		}
 		// Now test that the ticker stopped.