151 lines
2.9 KiB
Go
151 lines
2.9 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package lazy
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import (
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"errors"
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"sync"
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"testing"
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)
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func TestSyncValue(t *testing.T) {
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var lt SyncValue[int]
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n := int(testing.AllocsPerRun(1000, func() {
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got := lt.Get(fortyTwo)
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if got != 42 {
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t.Fatalf("got %v; want 42", got)
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}
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}))
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if n != 0 {
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t.Errorf("allocs = %v; want 0", n)
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}
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}
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func TestSyncValueErr(t *testing.T) {
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var lt SyncValue[int]
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n := int(testing.AllocsPerRun(1000, func() {
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got, err := lt.GetErr(func() (int, error) {
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return 42, nil
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})
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if got != 42 || err != nil {
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t.Fatalf("got %v, %v; want 42, nil", got, err)
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}
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}))
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if n != 0 {
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t.Errorf("allocs = %v; want 0", n)
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}
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var lterr SyncValue[int]
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wantErr := errors.New("test error")
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n = int(testing.AllocsPerRun(1000, func() {
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got, err := lterr.GetErr(func() (int, error) {
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return 0, wantErr
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})
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if got != 0 || err != wantErr {
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t.Fatalf("got %v, %v; want 0, %v", got, err, wantErr)
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}
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}))
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if n != 0 {
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t.Errorf("allocs = %v; want 0", n)
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}
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}
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func TestSyncValueSet(t *testing.T) {
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var lt SyncValue[int]
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if !lt.Set(42) {
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t.Fatalf("Set failed")
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}
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if lt.Set(43) {
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t.Fatalf("Set succeeded after first Set")
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}
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n := int(testing.AllocsPerRun(1000, func() {
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got := lt.Get(fortyTwo)
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if got != 42 {
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t.Fatalf("got %v; want 42", got)
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}
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}))
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if n != 0 {
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t.Errorf("allocs = %v; want 0", n)
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}
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}
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func TestSyncValueMustSet(t *testing.T) {
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var lt SyncValue[int]
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lt.MustSet(42)
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defer func() {
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if e := recover(); e == nil {
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t.Errorf("unexpected success; want panic")
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}
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}()
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lt.MustSet(43)
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}
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func TestSyncValueConcurrent(t *testing.T) {
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var (
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lt SyncValue[int]
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wg sync.WaitGroup
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start = make(chan struct{})
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routines = 10000
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)
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wg.Add(routines)
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for range routines {
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go func() {
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defer wg.Done()
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// Every goroutine waits for the go signal, so that more of them
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// have a chance to race on the initial Get than with sequential
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// goroutine starts.
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<-start
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got := lt.Get(fortyTwo)
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if got != 42 {
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t.Errorf("got %v; want 42", got)
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}
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}()
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}
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close(start)
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wg.Wait()
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}
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func TestSyncFunc(t *testing.T) {
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f := SyncFunc(fortyTwo)
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n := int(testing.AllocsPerRun(1000, func() {
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got := f()
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if got != 42 {
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t.Fatalf("got %v; want 42", got)
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}
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}))
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if n != 0 {
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t.Errorf("allocs = %v; want 0", n)
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}
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}
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func TestSyncFuncErr(t *testing.T) {
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f := SyncFuncErr(func() (int, error) {
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return 42, nil
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})
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n := int(testing.AllocsPerRun(1000, func() {
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got, err := f()
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if got != 42 || err != nil {
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t.Fatalf("got %v, %v; want 42, nil", got, err)
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}
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}))
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if n != 0 {
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t.Errorf("allocs = %v; want 0", n)
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}
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wantErr := errors.New("test error")
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f = SyncFuncErr(func() (int, error) {
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return 0, wantErr
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})
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n = int(testing.AllocsPerRun(1000, func() {
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got, err := f()
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if got != 0 || err != wantErr {
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t.Fatalf("got %v, %v; want 0, %v", got, err, wantErr)
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}
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}))
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if n != 0 {
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t.Errorf("allocs = %v; want 0", n)
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}
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}
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