From 3ca3fffdf01b94244ef6c2d93ed38a30da9fcb0a Mon Sep 17 00:00:00 2001
From: Anton Evangelatov <anton.evangelatov@gmail.com>
Date: Thu, 1 Mar 2018 18:55:31 +0100
Subject: [PATCH] metrics: fix flaky Example metrics test (#16222)

* metrics: add sleep to test in order to get predictable output

* metrics: relax constraints on timer test
---
 metrics/metrics_test.go | 3 ++-
 metrics/timer_test.go   | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/metrics/metrics_test.go b/metrics/metrics_test.go
index 726fba3475..df36da0ade 100644
--- a/metrics/metrics_test.go
+++ b/metrics/metrics_test.go
@@ -6,6 +6,7 @@ import (
 	"log"
 	"sync"
 	"testing"
+	"time"
 )
 
 const FANOUT = 128
@@ -114,7 +115,7 @@ func Example() {
 
 	// Threadsafe registration
 	t := GetOrRegisterTimer("db.get.latency", nil)
-	t.Time(func() {})
+	t.Time(func() { time.Sleep(10 * time.Millisecond) })
 	t.Update(1)
 
 	fmt.Println(c.Count())
diff --git a/metrics/timer_test.go b/metrics/timer_test.go
index f85c9b803d..c1f0ff9388 100644
--- a/metrics/timer_test.go
+++ b/metrics/timer_test.go
@@ -47,8 +47,8 @@ func TestTimerStop(t *testing.T) {
 func TestTimerFunc(t *testing.T) {
 	tm := NewTimer()
 	tm.Time(func() { time.Sleep(50e6) })
-	if max := tm.Max(); 45e6 > max || max > 55e6 {
-		t.Errorf("tm.Max(): 45e6 > %v || %v > 55e6\n", max, max)
+	if max := tm.Max(); 35e6 > max || max > 95e6 {
+		t.Errorf("tm.Max(): 35e6 > %v || %v > 95e6\n", max, max)
 	}
 }