libgo/go/io/ioutil/ioutil_test.go

   1 // Copyright 2009 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 ioutil_test
   6
   7 import (
   8         "bytes"
   9         . "io/ioutil"
  10         "os"
  11         "path/filepath"
  12         "testing"
  13 )
  14
  15 func checkSize(t *testing.T, path string, size int64) {
  16         dir, err := os.Stat(path)
  17         if err != nil {
  18                 t.Fatalf("Stat %q (looking for size %d): %s", path, size, err)
  19         }
  20         if dir.Size() != size {
  21                 t.Errorf("Stat %q: size %d want %d", path, dir.Size(), size)
  22         }
  23 }
  24
  25 func TestReadFile(t *testing.T) {
  26         filename := "rumpelstilzchen"
  27         contents, err := ReadFile(filename)
  28         if err == nil {
  29                 t.Fatalf("ReadFile %s: error expected, none found", filename)
  30         }
  31
  32         filename = "ioutil_test.go"
  33         contents, err = ReadFile(filename)
  34         if err != nil {
  35                 t.Fatalf("ReadFile %s: %v", filename, err)
  36         }
  37
  38         checkSize(t, filename, int64(len(contents)))
  39 }
  40
  41 func TestWriteFile(t *testing.T) {
  42         f, err := TempFile("", "ioutil-test")
  43         if err != nil {
  44                 t.Fatal(err)
  45         }
  46         filename := f.Name()
  47         data := "Programming today is a race between software engineers striving to " +
  48                 "build bigger and better idiot-proof programs, and the Universe trying " +
  49                 "to produce bigger and better idiots. So far, the Universe is winning."
  50
  51         if err := WriteFile(filename, []byte(data), 0644); err != nil {
  52                 t.Fatalf("WriteFile %s: %v", filename, err)
  53         }
  54
  55         contents, err := ReadFile(filename)
  56         if err != nil {
  57                 t.Fatalf("ReadFile %s: %v", filename, err)
  58         }
  59
  60         if string(contents) != data {
  61                 t.Fatalf("contents = %q\nexpected = %q", string(contents), data)
  62         }
  63
  64         // cleanup
  65         f.Close()
  66         os.Remove(filename) // ignore error
  67 }
  68
  69 func TestReadOnlyWriteFile(t *testing.T) {
  70         if os.Getuid() == 0 {
  71                 t.Skipf("Root can write to read-only files anyway, so skip the read-only test.")
  72         }
  73
  74         // We don't want to use TempFile directly, since that opens a file for us as 0600.
  75         tempDir, err := TempDir("", t.Name())
  76         if err != nil {
  77                 t.Fatalf("TempDir %s: %v", t.Name(), err)
  78         }
  79         defer os.RemoveAll(tempDir)
  80         filename := filepath.Join(tempDir, "blurp.txt")
  81
  82         shmorp := []byte("shmorp")
  83         florp := []byte("florp")
  84         err = WriteFile(filename, shmorp, 0444)
  85         if err != nil {
  86                 t.Fatalf("WriteFile %s: %v", filename, err)
  87         }
  88         err = WriteFile(filename, florp, 0444)
  89         if err == nil {
  90                 t.Fatalf("Expected an error when writing to read-only file %s", filename)
  91         }
  92         got, err := ReadFile(filename)
  93         if err != nil {
  94                 t.Fatalf("ReadFile %s: %v", filename, err)
  95         }
  96         if !bytes.Equal(got, shmorp) {
  97                 t.Fatalf("want %s, got %s", shmorp, got)
  98         }
  99 }
 100
 101 func TestReadDir(t *testing.T) {
 102         dirname := "rumpelstilzchen"
 103         _, err := ReadDir(dirname)
 104         if err == nil {
 105                 t.Fatalf("ReadDir %s: error expected, none found", dirname)
 106         }
 107
 108         /* Does not work in gccgo testing environment.
 109         dirname = ".."
 110         list, err := ReadDir(dirname)
 111         if err != nil {
 112                 t.Fatalf("ReadDir %s: %v", dirname, err)
 113         }
 114
 115         foundFile := false
 116         foundSubDir := false
 117         for _, dir := range list {
 118                 switch {
 119                 case !dir.IsDir() && dir.Name() == "io_test.go":
 120                         foundFile = true
 121                 case dir.IsDir() && dir.Name() == "ioutil":
 122                         foundSubDir = true
 123                 }
 124         }
 125         if !foundFile {
 126                 t.Fatalf("ReadDir %s: io_test.go file not found", dirname)
 127         }
 128         if !foundSubDir {
 129                 t.Fatalf("ReadDir %s: ioutil directory not found", dirname)
 130         }
 131         */
 132 }