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// Copyright (c) 2020 Tailscale Inc & 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 syncs
import (
"context"
"testing"
)
func TestWaitGroupChan(t *testing.T) {
wg := NewWaitGroupChan()
wantNotDone := func() {
t.Helper()
select {
case <-wg.DoneChan():
t.Fatal("done too early")
default:
}
}
wantDone := func() {
t.Helper()
select {
case <-wg.DoneChan():
default:
t.Fatal("expected to be done")
}
}
wg.Add(2)
wantNotDone()
wg.Decr()
wantNotDone()
wg.Decr()
wantDone()
wantDone()
}
func TestClosedChan(t *testing.T) {
ch := ClosedChan()
for i := 0; i < 2; i++ {
select {
case <-ch:
default:
t.Fatal("not closed")
}
}
}
func TestSemaphore(t *testing.T) {
s := NewSemaphore(2)
s.Acquire()
if !s.TryAcquire() {
t.Fatal("want true")
}
if s.TryAcquire() {
t.Fatal("want false")
}
ctx, cancel := context.WithCancel(context.Background())
cancel()
if s.AcquireContext(ctx) {
t.Fatal("want false")
}
s.Release()
if !s.AcquireContext(context.Background()) {
t.Fatal("want true")
}
s.Release()
s.Release()
}
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