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// Copyright 2011 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 sync_test
import (
. "sync"
"testing"
)
func testWaitGroup(t *testing.T, wg1 *WaitGroup, wg2 *WaitGroup) {
n := 16
wg1.Add(n)
wg2.Add(n)
exited := make(chan bool, n)
for i := 0; i != n; i++ {
go func(i int) {
wg1.Done()
wg2.Wait()
exited <- true
}(i)
}
wg1.Wait()
for i := 0; i != n; i++ {
select {
case <-exited:
t.Fatal("WaitGroup released group too soon")
default:
}
wg2.Done()
}
for i := 0; i != n; i++ {
<-exited // Will block if barrier fails to unlock someone.
}
}
func TestWaitGroup(t *testing.T) {
wg1 := &WaitGroup{}
wg2 := &WaitGroup{}
// Run the same test a few times to ensure barrier is in a proper state.
for i := 0; i != 8; i++ {
testWaitGroup(t, wg1, wg2)
}
}
func TestWaitGroupMisuse(t *testing.T) {
defer func() {
err := recover()
if err != "sync: negative WaitGroup count" {
t.Fatalf("Unexpected panic: %#v", err)
}
}()
wg := &WaitGroup{}
wg.Add(1)
wg.Done()
wg.Done()
t.Fatal("Should panic")
}
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