github.com/AESNooper/go/src@v0.0.0-20220218095104-b56a4ab1bbbb/os/error_test.go (about) 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 }