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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package lazy
import (
"errors"
"testing"
)
func fortyTwo() int { return 42 }
func TestGValue(t *testing.T) {
var lt GValue[int]
n := int(testing.AllocsPerRun(1000, func() {
got := lt.Get(fortyTwo)
if got != 42 {
t.Fatalf("got %v; want 42", got)
}
}))
if n != 0 {
t.Errorf("allocs = %v; want 0", n)
}
}
func TestGValueErr(t *testing.T) {
var lt GValue[int]
n := int(testing.AllocsPerRun(1000, func() {
got, err := lt.GetErr(func() (int, error) {
return 42, nil
})
if got != 42 || err != nil {
t.Fatalf("got %v, %v; want 42, nil", got, err)
}
}))
if n != 0 {
t.Errorf("allocs = %v; want 0", n)
}
var lterr GValue[int]
wantErr := errors.New("test error")
n = int(testing.AllocsPerRun(1000, func() {
got, err := lterr.GetErr(func() (int, error) {
return 0, wantErr
})
if got != 0 || err != wantErr {
t.Fatalf("got %v, %v; want 0, %v", got, err, wantErr)
}
}))
if n != 0 {
t.Errorf("allocs = %v; want 0", n)
}
}
func TestGValueSet(t *testing.T) {
var lt GValue[int]
if !lt.Set(42) {
t.Fatalf("Set failed")
}
if lt.Set(43) {
t.Fatalf("Set succeeded after first Set")
}
n := int(testing.AllocsPerRun(1000, func() {
got := lt.Get(fortyTwo)
if got != 42 {
t.Fatalf("got %v; want 42", got)
}
}))
if n != 0 {
t.Errorf("allocs = %v; want 0", n)
}
}
func TestGValueMustSet(t *testing.T) {
var lt GValue[int]
lt.MustSet(42)
defer func() {
if e := recover(); e == nil {
t.Errorf("unexpected success; want panic")
}
}()
lt.MustSet(43)
}
func TestGValueRecursivePanic(t *testing.T) {
defer func() {
if e := recover(); e != nil {
t.Logf("got panic, as expected")
} else {
t.Errorf("unexpected success; want panic")
}
}()
v := GValue[int]{}
v.Get(func() int {
return v.Get(func() int { return 42 })
})
}
func TestGFunc(t *testing.T) {
f := GFunc(fortyTwo)
n := int(testing.AllocsPerRun(1000, func() {
got := f()
if got != 42 {
t.Fatalf("got %v; want 42", got)
}
}))
if n != 0 {
t.Errorf("allocs = %v; want 0", n)
}
}
func TestGFuncErr(t *testing.T) {
f := GFuncErr(func() (int, error) {
return 42, nil
})
n := int(testing.AllocsPerRun(1000, func() {
got, err := f()
if got != 42 || err != nil {
t.Fatalf("got %v, %v; want 42, nil", got, err)
}
}))
if n != 0 {
t.Errorf("allocs = %v; want 0", n)
}
wantErr := errors.New("test error")
f = GFuncErr(func() (int, error) {
return 0, wantErr
})
n = int(testing.AllocsPerRun(1000, func() {
got, err := f()
if got != 0 || err != wantErr {
t.Fatalf("got %v, %v; want 0, %v", got, err, wantErr)
}
}))
if n != 0 {
t.Errorf("allocs = %v; want 0", n)
}
}
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