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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package syncs
import (
"context"
"io"
"os"
"testing"
"github.com/google/go-cmp/cmp"
)
func TestAtomicValue(t *testing.T) {
{
// Always wrapping should not allocate for simple values
// because wrappedValue[T] has the same memory layout as T.
var v AtomicValue[bool]
bools := []bool{true, false}
if n := int(testing.AllocsPerRun(1000, func() {
for _, b := range bools {
v.Store(b)
}
})); n != 0 {
t.Errorf("AllocsPerRun = %d, want 0", n)
}
}
{
var v AtomicValue[int]
got, gotOk := v.LoadOk()
if got != 0 || gotOk {
t.Fatalf("LoadOk = (%v, %v), want (0, false)", got, gotOk)
}
v.Store(1)
got, gotOk = v.LoadOk()
if got != 1 || !gotOk {
t.Fatalf("LoadOk = (%v, %v), want (1, true)", got, gotOk)
}
}
{
var v AtomicValue[error]
got, gotOk := v.LoadOk()
if got != nil || gotOk {
t.Fatalf("LoadOk = (%v, %v), want (nil, false)", got, gotOk)
}
v.Store(io.EOF)
got, gotOk = v.LoadOk()
if got != io.EOF || !gotOk {
t.Fatalf("LoadOk = (%v, %v), want (EOF, true)", got, gotOk)
}
err := &os.PathError{}
v.Store(err)
got, gotOk = v.LoadOk()
if got != err || !gotOk {
t.Fatalf("LoadOk = (%v, %v), want (%v, true)", got, gotOk, err)
}
v.Store(nil)
got, gotOk = v.LoadOk()
if got != nil || !gotOk {
t.Fatalf("LoadOk = (%v, %v), want (nil, true)", got, gotOk)
}
}
}
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 range 2 {
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.LoadFunc("noexist", func(v int, ok bool) {
if v != 0 || ok {
t.Errorf(`LoadFunc("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)
}
m.LoadFunc("one", func(v int, ok bool) {
if v != 1 || !ok {
t.Errorf(`LoadFunc("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)
}
if v, ok := m.LoadOrInit("three", func() int { return 3 }); v != 3 || ok {
t.Errorf(`LoadOrInit("three", 3) = (%v, %v), want (3, true)`, v, ok)
}
got := map[string]int{}
want := map[string]int{"one": 1, "two": 2, "three": 3}
for k, v := range m.All() {
got[k] = v
}
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("three")
m.Delete("one")
m.Delete("noexist")
got = map[string]int{}
want = map[string]int{}
for k, v := range m.All() {
got[k] = v
}
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 WaitGroup
var ok1, ok2 bool
wg.Go(func() { _, ok1 = m.LoadOrStore("", "") })
wg.Go(func() { _, ok2 = m.LoadOrStore("", "") })
wg.Wait()
if ok1 == ok2 {
t.Errorf("exactly one LoadOrStore should load")
}
})
t.Run("Clear", func(t *testing.T) {
var m Map[string, string]
_, _ = m.LoadOrStore("a", "1")
_, _ = m.LoadOrStore("b", "2")
_, _ = m.LoadOrStore("c", "3")
_, _ = m.LoadOrStore("d", "4")
_, _ = m.LoadOrStore("e", "5")
if m.Len() != 5 {
t.Errorf("Len after loading want=5 got=%d", m.Len())
}
m.Clear()
if m.Len() != 0 {
t.Errorf("Len after Clear want=0 got=%d", m.Len())
}
})
t.Run("Swap", func(t *testing.T) {
var m Map[string, string]
m.Store("hello", "world")
if got, want := m.Swap("hello", "world2"), "world"; got != want {
t.Errorf("got old value %q, want %q", got, want)
}
if got := m.Swap("empty", "foo"); got != "" {
t.Errorf("got old value %q, want empty string", got)
}
})
}
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