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         "fmt"
   9         "io/ioutil"
  10         "os"
  11         "path/filepath"
  12         "testing"
  13 )
  14
  15 func TestErrIsExist(t *testing.T) {
  16         f, err := ioutil.TempFile("", "_Go_ErrIsExist")
  17         if err != nil {
  18                 t.Fatalf("open ErrIsExist tempfile: %s", err)
  19                 return
  20         }
  21         defer os.Remove(f.Name())
  22         defer f.Close()
  23         f2, err := os.OpenFile(f.Name(), os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
  24         if err == nil {
  25                 f2.Close()
  26                 t.Fatal("Open should have failed")
  27                 return
  28         }
  29         if s := checkErrorPredicate("os.IsExist", os.IsExist, err); s != "" {
  30                 t.Fatal(s)
  31                 return
  32         }
  33 }
  34
  35 func testErrNotExist(name string) string {
  36         f, err := os.Open(name)
  37         if err == nil {
  38                 f.Close()
  39                 return "Open should have failed"
  40         }
  41         if s := checkErrorPredicate("os.IsNotExist", os.IsNotExist, err); s != "" {
  42                 return s
  43         }
  44
  45         err = os.Chdir(name)
  46         if err == nil {
  47                 return "Chdir should have failed"
  48         }
  49         if s := checkErrorPredicate("os.IsNotExist", os.IsNotExist, err); s != "" {
  50                 return s
  51         }
  52         return ""
  53 }
  54
  55 func TestErrIsNotExist(t *testing.T) {
  56         tmpDir, err := ioutil.TempDir("", "_Go_ErrIsNotExist")
  57         if err != nil {
  58                 t.Fatalf("create ErrIsNotExist tempdir: %s", err)
  59                 return
  60         }
  61         defer os.RemoveAll(tmpDir)
  62
  63         name := filepath.Join(tmpDir, "NotExists")
  64         if s := testErrNotExist(name); s != "" {
  65                 t.Fatal(s)
  66                 return
  67         }
  68
  69         name = filepath.Join(name, "NotExists2")
  70         if s := testErrNotExist(name); s != "" {
  71                 t.Fatal(s)
  72                 return
  73         }
  74 }
  75
  76 func checkErrorPredicate(predName string, pred func(error) bool, err error) string {
  77         if !pred(err) {
  78                 return fmt.Sprintf("%s does not work as expected for %#v", predName, err)
  79         }
  80         return ""
  81 }