libgo/go/os/error_test.go

   1 // Copyright 2012 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package os_test
   6
   7 import (
   8         "errors"
   9         "fmt"
  10         "io/fs"
  11         "os"
  12         "path/filepath"
  13         "testing"
  14 )
  15
  16 func TestErrIsExist(t *testing.T) {
  17         f, err := os.CreateTemp("", "_Go_ErrIsExist")
  18         if err != nil {
  19                 t.Fatalf("open ErrIsExist tempfile: %s", err)
  20                 return
  21         }
  22         defer os.Remove(f.Name())
  23         defer f.Close()
  24         f2, err := os.OpenFile(f.Name(), os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
  25         if err == nil {
  26                 f2.Close()
  27                 t.Fatal("Open should have failed")
  28                 return
  29         }
  30         if s := checkErrorPredicate("os.IsExist", os.IsExist, err, fs.ErrExist); s != "" {
  31                 t.Fatal(s)
  32                 return
  33         }
  34 }
  35
  36 func testErrNotExist(t *testing.T, name string) string {
  37         originalWD, err := os.Getwd()
  38         if err != nil {
  39                 t.Fatal(err)
  40         }
  41
  42         f, err := os.Open(name)
  43         if err == nil {
  44                 f.Close()
  45                 return "Open should have failed"
  46         }
  47         if s := checkErrorPredicate("os.IsNotExist", os.IsNotExist, err, fs.ErrNotExist); s != "" {
  48                 return s
  49         }
  50
  51         err = os.Chdir(name)
  52         if err == nil {
  53                 if err := os.Chdir(originalWD); err != nil {
  54                         t.Fatalf("Chdir should have failed, failed to restore original working directory: %v", err)
  55                 }
  56                 return "Chdir should have failed, restored original working directory"
  57         }
  58         if s := checkErrorPredicate("os.IsNotExist", os.IsNotExist, err, fs.ErrNotExist); s != "" {
  59                 return s
  60         }
  61         return ""
  62 }
  63
  64 func TestErrIsNotExist(t *testing.T) {
  65         tmpDir := t.TempDir()
  66         name := filepath.Join(tmpDir, "NotExists")
  67         if s := testErrNotExist(t, name); s != "" {
  68                 t.Fatal(s)
  69                 return
  70         }
  71
  72         name = filepath.Join(name, "NotExists2")
  73         if s := testErrNotExist(t, name); s != "" {
  74                 t.Fatal(s)
  75                 return
  76         }
  77 }
  78
  79 func checkErrorPredicate(predName string, pred func(error) bool, err, target error) string {
  80         if !pred(err) {
  81                 return fmt.Sprintf("%s does not work as expected for %#v", predName, err)
  82         }
  83         if !errors.Is(err, target) {
  84                 return fmt.Sprintf("errors.Is(%#v, %#v) = false, want true", err, target)
  85         }
  86         return ""
  87 }
  88
  89 type isExistTest struct {
  90         err   error
  91         is    bool
  92         isnot bool
  93 }
  94
  95 var isExistTests = []isExistTest{
  96         {&fs.PathError{Err: fs.ErrInvalid}, false, false},
  97         {&fs.PathError{Err: fs.ErrPermission}, false, false},
  98         {&fs.PathError{Err: fs.ErrExist}, true, false},
  99         {&fs.PathError{Err: fs.ErrNotExist}, false, true},
 100         {&fs.PathError{Err: fs.ErrClosed}, false, false},
 101         {&os.LinkError{Err: fs.ErrInvalid}, false, false},
 102         {&os.LinkError{Err: fs.ErrPermission}, false, false},
 103         {&os.LinkError{Err: fs.ErrExist}, true, false},
 104         {&os.LinkError{Err: fs.ErrNotExist}, false, true},
 105         {&os.LinkError{Err: fs.ErrClosed}, false, false},
 106         {&os.SyscallError{Err: fs.ErrNotExist}, false, true},
 107         {&os.SyscallError{Err: fs.ErrExist}, true, false},
 108         {nil, false, false},
 109 }
 110
 111 func TestIsExist(t *testing.T) {
 112         for _, tt := range isExistTests {
 113                 if is := os.IsExist(tt.err); is != tt.is {
 114                         t.Errorf("os.IsExist(%T %v) = %v, want %v", tt.err, tt.err, is, tt.is)
 115                 }
 116                 if is := errors.Is(tt.err, fs.ErrExist); is != tt.is {
 117                         t.Errorf("errors.Is(%T %v, fs.ErrExist) = %v, want %v", tt.err, tt.err, is, tt.is)
 118                 }
 119                 if isnot := os.IsNotExist(tt.err); isnot != tt.isnot {
 120                         t.Errorf("os.IsNotExist(%T %v) = %v, want %v", tt.err, tt.err, isnot, tt.isnot)
 121                 }
 122                 if isnot := errors.Is(tt.err, fs.ErrNotExist); isnot != tt.isnot {
 123                         t.Errorf("errors.Is(%T %v, fs.ErrNotExist) = %v, want %v", tt.err, tt.err, isnot, tt.isnot)
 124                 }
 125         }
 126 }
 127
 128 type isPermissionTest struct {
 129         err  error
 130         want bool
 131 }
 132
 133 var isPermissionTests = []isPermissionTest{
 134         {nil, false},
 135         {&fs.PathError{Err: fs.ErrPermission}, true},
 136         {&os.SyscallError{Err: fs.ErrPermission}, true},
 137 }
 138
 139 func TestIsPermission(t *testing.T) {
 140         for _, tt := range isPermissionTests {
 141                 if got := os.IsPermission(tt.err); got != tt.want {
 142                         t.Errorf("os.IsPermission(%#v) = %v; want %v", tt.err, got, tt.want)
 143                 }
 144                 if got := errors.Is(tt.err, fs.ErrPermission); got != tt.want {
 145                         t.Errorf("errors.Is(%#v, fs.ErrPermission) = %v; want %v", tt.err, got, tt.want)
 146                 }
 147         }
 148 }
 149
 150 func TestErrPathNUL(t *testing.T) {
 151         f, err := os.CreateTemp("", "_Go_ErrPathNUL\x00")
 152         if err == nil {
 153                 f.Close()
 154                 t.Fatal("TempFile should have failed")
 155         }
 156         f, err = os.CreateTemp("", "_Go_ErrPathNUL")
 157         if err != nil {
 158                 t.Fatalf("open ErrPathNUL tempfile: %s", err)
 159         }
 160         defer os.Remove(f.Name())
 161         defer f.Close()
 162         f2, err := os.OpenFile(f.Name(), os.O_RDWR, 0600)
 163         if err != nil {
 164                 t.Fatalf("open ErrPathNUL: %s", err)
 165         }
 166         f2.Close()
 167         f2, err = os.OpenFile(f.Name()+"\x00", os.O_RDWR, 0600)
 168         if err == nil {
 169                 f2.Close()
 170                 t.Fatal("Open should have failed")
 171         }
 172 }
 173
 174 func TestPathErrorUnwrap(t *testing.T) {
 175         pe := &fs.PathError{Err: fs.ErrInvalid}
 176         if !errors.Is(pe, fs.ErrInvalid) {
 177                 t.Error("errors.Is failed, wanted success")
 178         }
 179 }
 180
 181 type myErrorIs struct{ error }
 182
 183 func (e myErrorIs) Is(target error) bool { return target == e.error }
 184
 185 func TestErrorIsMethods(t *testing.T) {
 186         if os.IsPermission(myErrorIs{fs.ErrPermission}) {
 187                 t.Error("os.IsPermission(err) = true when err.Is(fs.ErrPermission), wanted false")
 188         }
 189 }