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internal/singleflight: deflake test

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Fixes #11475

Change-Id: Ibaedbb732bb1b9f062bd5af7b866ec4758c724a7
Reviewed-on: https://go-review.googlesource.com/11770
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Brad Fitzpatrick 2015-06-30 08:32:02 -07:00
parent f11109fbc9
commit 2714005a24
1 changed files with 11 additions and 8 deletions
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19
src/internal/singleflight/singleflight_test.go
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@ -42,11 +42,13 @@ func TestDoErr(t *testing.T) {
func TestDoDupSuppress(t *testing.T) {
var g Group
c := make(chan string)
c := make(chan string, 1)
var calls int32
fn := func() (interface{}, error) {
atomic.AddInt32(&calls, 1)
return <-c, nil
v := <-c
c <- v // pump; make available for any future calls
return v, nil
}
const n = 10
@ -54,20 +56,21 @@ func TestDoDupSuppress(t *testing.T) {
for i := 0; i < n; i++ {
wg.Add(1)
go func() {
defer wg.Done()
v, err, _ := g.Do("key", fn)
if err != nil {
t.Errorf("Do error: %v", err)
return
}
if v.(string) != "bar" {
t.Errorf("got %q; want %q", v, "bar")
if s, _ := v.(string); s != "bar" {
t.Errorf("Do = %T %v; want %q", v, v, "bar")
}
wg.Done()
}()
}
time.Sleep(100 * time.Millisecond) // let goroutines above block
time.Sleep(10 * time.Millisecond) // let some goroutines above block in Do
c <- "bar"
wg.Wait()
if got := atomic.LoadInt32(&calls); got != 1 {
t.Errorf("number of calls = %d; want 1", got)
if got := atomic.LoadInt32(&calls); got <= 0 || got >= n {
t.Errorf("number of calls = %d; want over 0 and less than n", got)
}
}