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// Copyright 2012 The Go 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 os_test
import (
"errors"
"fmt"
"io/fs"
"os"
"path/filepath"
"testing"
)
func TestErrIsExist(t *testing.T) {
f, err := os.CreateTemp("", "_Go_ErrIsExist")
if err != nil {
t.Fatalf("open ErrIsExist tempfile: %s", err)
return
}
defer os.Remove(f.Name())
defer f.Close()
f2, err := os.OpenFile(f.Name(), os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
if err == nil {
f2.Close()
t.Fatal("Open should have failed")
return
}
if s := checkErrorPredicate("os.IsExist", os.IsExist, err, fs.ErrExist); s != "" {
t.Fatal(s)
return
}
}
func testErrNotExist(name string) string {
f, err := os.Open(name)
if err == nil {
f.Close()
return "Open should have failed"
}
if s := checkErrorPredicate("os.IsNotExist", os.IsNotExist, err, fs.ErrNotExist); s != "" {
return s
}
err = os.Chdir(name)
if err == nil {
return "Chdir should have failed"
}
if s := checkErrorPredicate("os.IsNotExist", os.IsNotExist, err, fs.ErrNotExist); s != "" {
return s
}
return ""
}
func TestErrIsNotExist(t *testing.T) {
tmpDir, err := os.MkdirTemp("", "_Go_ErrIsNotExist")
if err != nil {
t.Fatalf("create ErrIsNotExist tempdir: %s", err)
return
}
defer os.RemoveAll(tmpDir)
name := filepath.Join(tmpDir, "NotExists")
if s := testErrNotExist(name); s != "" {
t.Fatal(s)
return
}
name = filepath.Join(name, "NotExists2")
if s := testErrNotExist(name); s != "" {
t.Fatal(s)
return
}
}
func checkErrorPredicate(predName string, pred func(error) bool, err, target error) string {
if !pred(err) {
return fmt.Sprintf("%s does not work as expected for %#v", predName, err)
}
if !errors.Is(err, target) {
return fmt.Sprintf("errors.Is(%#v, %#v) = false, want true", err, target)
}
return ""
}
type isExistTest struct {
err error
is bool
isnot bool
}
var isExistTests = []isExistTest{
{&fs.PathError{Err: fs.ErrInvalid}, false, false},
{&fs.PathError{Err: fs.ErrPermission}, false, false},
{&fs.PathError{Err: fs.ErrExist}, true, false},
{&fs.PathError{Err: fs.ErrNotExist}, false, true},
{&fs.PathError{Err: fs.ErrClosed}, false, false},
{&os.LinkError{Err: fs.ErrInvalid}, false, false},
{&os.LinkError{Err: fs.ErrPermission}, false, false},
{&os.LinkError{Err: fs.ErrExist}, true, false},
{&os.LinkError{Err: fs.ErrNotExist}, false, true},
{&os.LinkError{Err: fs.ErrClosed}, false, false},
{&os.SyscallError{Err: fs.ErrNotExist}, false, true},
{&os.SyscallError{Err: fs.ErrExist}, true, false},
{nil, false, false},
}
func TestIsExist(t *testing.T) {
for _, tt := range isExistTests {
if is := os.IsExist(tt.err); is != tt.is {
t.Errorf("os.IsExist(%T %v) = %v, want %v", tt.err, tt.err, is, tt.is)
}
if is := errors.Is(tt.err, fs.ErrExist); is != tt.is {
t.Errorf("errors.Is(%T %v, fs.ErrExist) = %v, want %v", tt.err, tt.err, is, tt.is)
}
if isnot := os.IsNotExist(tt.err); isnot != tt.isnot {
t.Errorf("os.IsNotExist(%T %v) = %v, want %v", tt.err, tt.err, isnot, tt.isnot)
}
if isnot := errors.Is(tt.err, fs.ErrNotExist); isnot != tt.isnot {
t.Errorf("errors.Is(%T %v, fs.ErrNotExist) = %v, want %v", tt.err, tt.err, isnot, tt.isnot)
}
}
}
type isPermissionTest struct {
err error
want bool
}
var isPermissionTests = []isPermissionTest{
{nil, false},
{&fs.PathError{Err: fs.ErrPermission}, true},
{&os.SyscallError{Err: fs.ErrPermission}, true},
}
func TestIsPermission(t *testing.T) {
for _, tt := range isPermissionTests {
if got := os.IsPermission(tt.err); got != tt.want {
t.Errorf("os.IsPermission(%#v) = %v; want %v", tt.err, got, tt.want)
}
if got := errors.Is(tt.err, fs.ErrPermission); got != tt.want {
t.Errorf("errors.Is(%#v, fs.ErrPermission) = %v; want %v", tt.err, got, tt.want)
}
}
}
func TestErrPathNUL(t *testing.T) {
f, err := os.CreateTemp("", "_Go_ErrPathNUL\x00")
if err == nil {
f.Close()
t.Fatal("TempFile should have failed")
}
f, err = os.CreateTemp("", "_Go_ErrPathNUL")
if err != nil {
t.Fatalf("open ErrPathNUL tempfile: %s", err)
}
defer os.Remove(f.Name())
defer f.Close()
f2, err := os.OpenFile(f.Name(), os.O_RDWR, 0600)
if err != nil {
t.Fatalf("open ErrPathNUL: %s", err)
}
f2.Close()
f2, err = os.OpenFile(f.Name()+"\x00", os.O_RDWR, 0600)
if err == nil {
f2.Close()
t.Fatal("Open should have failed")
}
}
func TestPathErrorUnwrap(t *testing.T) {
pe := &fs.PathError{Err: fs.ErrInvalid}
if !errors.Is(pe, fs.ErrInvalid) {
t.Error("errors.Is failed, wanted success")
}
}
type myErrorIs struct{ error }
func (e myErrorIs) Is(target error) bool { return target == e.error }
func TestErrorIsMethods(t *testing.T) {
if os.IsPermission(myErrorIs{fs.ErrPermission}) {
t.Error("os.IsPermission(err) = true when err.Is(fs.ErrPermission), wanted false")
}
}
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