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
   6
   7 import (
   8         "os"
   9         "testing"
  10 )
  11
  12 func checkSize(t *testing.T, path string, size int64) {
  13         dir, err := os.Stat(path)
  14         if err != nil {
  15                 t.Fatalf("Stat %q (looking for size %d): %s", path, size, err)
  16         }
  17         if dir.Size() != size {
  18                 t.Errorf("Stat %q: size %d want %d", path, dir.Size(), size)
  19         }
  20 }
  21
  22 func TestReadFile(t *testing.T) {
  23         filename := "rumpelstilzchen"
  24         contents, err := ReadFile(filename)
  25         if err == nil {
  26                 t.Fatalf("ReadFile %s: error expected, none found", filename)
  27         }
  28
  29         filename = "ioutil_test.go"
  30         contents, err = ReadFile(filename)
  31         if err != nil {
  32                 t.Fatalf("ReadFile %s: %v", filename, err)
  33         }
  34
  35         checkSize(t, filename, int64(len(contents)))
  36 }
  37
  38 func TestWriteFile(t *testing.T) {
  39         f, err := TempFile("", "ioutil-test")
  40         if err != nil {
  41                 t.Fatal(err)
  42         }
  43         filename := f.Name()
  44         data := "Programming today is a race between software engineers striving to " +
  45                 "build bigger and better idiot-proof programs, and the Universe trying " +
  46                 "to produce bigger and better idiots. So far, the Universe is winning."
  47
  48         if err := WriteFile(filename, []byte(data), 0644); err != nil {
  49                 t.Fatalf("WriteFile %s: %v", filename, err)
  50         }
  51
  52         contents, err := ReadFile(filename)
  53         if err != nil {
  54                 t.Fatalf("ReadFile %s: %v", filename, err)
  55         }
  56
  57         if string(contents) != data {
  58                 t.Fatalf("contents = %q\nexpected = %q", string(contents), data)
  59         }
  60
  61         // cleanup
  62         f.Close()
  63         os.Remove(filename) // ignore error
  64 }
  65
  66 func TestReadDir(t *testing.T) {
  67         dirname := "rumpelstilzchen"
  68         _, err := ReadDir(dirname)
  69         if err == nil {
  70                 t.Fatalf("ReadDir %s: error expected, none found", dirname)
  71         }
  72
  73         /* Does not work in gccgo testing environment.
  74         dirname = ".."
  75         list, err := ReadDir(dirname)
  76         if err != nil {
  77                 t.Fatalf("ReadDir %s: %v", dirname, err)
  78         }
  79
  80         foundFile := false
  81         foundSubDir := false
  82         for _, dir := range list {
  83                 switch {
  84                 case !dir.IsDir() && dir.Name() == "io_test.go":
  85                         foundFile = true
  86                 case dir.IsDir() && dir.Name() == "ioutil":
  87                         foundSubDir = true
  88                 }
  89         }
  90         if !foundFile {
  91                 t.Fatalf("ReadDir %s: io_test.go file not found", dirname)
  92         }
  93         if !foundSubDir {
  94                 t.Fatalf("ReadDir %s: ioutil directory not found", dirname)
  95         }
  96         */
  97 }