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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package syncs
import (
"context"
"sync"
"testing"
"github.com/google/go-cmp/cmp"
)
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()
}
func TestMap(t *testing.T) {
var m Map[string, int]
if v, ok := m.Load("noexist"); v != 0 || ok {
t.Errorf(`Load("noexist") = (%v, %v), want (0, false)`, v, ok)
}
m.Store("one", 1)
if v, ok := m.LoadOrStore("one", -1); v != 1 || !ok {
t.Errorf(`LoadOrStore("one", 1) = (%v, %v), want (1, true)`, v, ok)
}
if v, ok := m.Load("one"); v != 1 || !ok {
t.Errorf(`Load("one") = (%v, %v), want (1, true)`, v, ok)
}
if v, ok := m.LoadOrStore("two", 2); v != 2 || ok {
t.Errorf(`LoadOrStore("two", 2) = (%v, %v), want (2, false)`, v, ok)
}
got := map[string]int{}
want := map[string]int{"one": 1, "two": 2}
m.Range(func(k string, v int) bool {
got[k] = v
return true
})
if d := cmp.Diff(got, want); d != "" {
t.Errorf("Range mismatch (-got +want):\n%s", d)
}
if v, ok := m.LoadAndDelete("two"); v != 2 || !ok {
t.Errorf(`LoadAndDelete("two) = (%v, %v), want (2, true)`, v, ok)
}
if v, ok := m.LoadAndDelete("two"); v != 0 || ok {
t.Errorf(`LoadAndDelete("two) = (%v, %v), want (0, false)`, v, ok)
}
m.Delete("one")
m.Delete("noexist")
got = map[string]int{}
want = map[string]int{}
m.Range(func(k string, v int) bool {
got[k] = v
return true
})
if d := cmp.Diff(got, want); d != "" {
t.Errorf("Range mismatch (-got +want):\n%s", d)
}
t.Run("LoadOrStore", func(t *testing.T) {
var m Map[string, string]
var wg sync.WaitGroup
wg.Add(2)
var ok1, ok2 bool
go func() {
defer wg.Done()
_, ok1 = m.LoadOrStore("", "")
}()
go func() {
defer wg.Done()
_, ok2 = m.LoadOrStore("", "")
}()
wg.Wait()
if ok1 == ok2 {
t.Errorf("exactly one LoadOrStore should load")
}
})
}
|
