Source file
src/os/read_test.go
1
2
3
4
5 package os_test
6
7 import (
8 "bytes"
9 "errors"
10 . "os"
11 "path/filepath"
12 "runtime"
13 "syscall"
14 "testing"
15 )
16
17 func checkNamedSize(t *testing.T, path string, size int64) {
18 dir, err := Stat(path)
19 if err != nil {
20 t.Fatalf("Stat %q (looking for size %d): %s", path, size, err)
21 }
22 if dir.Size() != size {
23 t.Errorf("Stat %q: size %d want %d", path, dir.Size(), size)
24 }
25 }
26
27 func TestReadFile(t *testing.T) {
28 t.Parallel()
29
30 filename := "rumpelstilzchen"
31 contents, err := ReadFile(filename)
32 if err == nil {
33 t.Fatalf("ReadFile %s: error expected, none found", filename)
34 }
35
36 filename = "read_test.go"
37 contents, err = ReadFile(filename)
38 if err != nil {
39 t.Fatalf("ReadFile %s: %v", filename, err)
40 }
41
42 checkNamedSize(t, filename, int64(len(contents)))
43 }
44
45 func TestWriteFile(t *testing.T) {
46 t.Parallel()
47
48 f, err := CreateTemp("", "os-test")
49 if err != nil {
50 t.Fatal(err)
51 }
52 defer f.Close()
53 defer Remove(f.Name())
54
55 msg := "Programming today is a race between software engineers striving to " +
56 "build bigger and better idiot-proof programs, and the Universe trying " +
57 "to produce bigger and better idiots. So far, the Universe is winning."
58
59 if err := WriteFile(f.Name(), []byte(msg), 0644); err != nil {
60 t.Fatalf("WriteFile %s: %v", f.Name(), err)
61 }
62
63 data, err := ReadFile(f.Name())
64 if err != nil {
65 t.Fatalf("ReadFile %s: %v", f.Name(), err)
66 }
67
68 if string(data) != msg {
69 t.Fatalf("ReadFile: wrong data:\nhave %q\nwant %q", string(data), msg)
70 }
71 }
72
73 func TestReadOnlyWriteFile(t *testing.T) {
74 if Getuid() == 0 {
75 t.Skipf("Root can write to read-only files anyway, so skip the read-only test.")
76 }
77 if runtime.GOOS == "wasip1" {
78 t.Skip("no support for file permissions on " + runtime.GOOS)
79 }
80 t.Parallel()
81
82
83 filename := filepath.Join(t.TempDir(), "blurp.txt")
84
85 shmorp := []byte("shmorp")
86 florp := []byte("florp")
87 err := WriteFile(filename, shmorp, 0444)
88 if err != nil {
89 t.Fatalf("WriteFile %s: %v", filename, err)
90 }
91 err = WriteFile(filename, florp, 0444)
92 if err == nil {
93 t.Fatalf("Expected an error when writing to read-only file %s", filename)
94 }
95 got, err := ReadFile(filename)
96 if err != nil {
97 t.Fatalf("ReadFile %s: %v", filename, err)
98 }
99 if !bytes.Equal(got, shmorp) {
100 t.Fatalf("want %s, got %s", shmorp, got)
101 }
102 }
103
104 func TestReadDir(t *testing.T) {
105 t.Parallel()
106
107 dirname := "rumpelstilzchen"
108 if _, err := ReadDir(dirname); err == nil {
109 t.Fatalf("ReadDir %s: error expected, none found", dirname)
110 }
111
112 filename := filepath.Join(t.TempDir(), "foo")
113 f, err := Create(filename)
114 if err != nil {
115 t.Fatal(err)
116 }
117 f.Close()
118 if list, err := ReadDir(filename); list != nil || !errors.Is(err, syscall.ENOTDIR) {
119 t.Fatalf("ReadDir %s: (nil, ENOTDIR) expected, got (%v, %v)", filename, list, err)
120 }
121
122 dirname = "."
123 list, err := ReadDir(dirname)
124 if err != nil {
125 t.Fatalf("ReadDir %s: %v", dirname, err)
126 }
127
128 foundFile := false
129 foundSubDir := false
130 for _, dir := range list {
131 switch {
132 case !dir.IsDir() && dir.Name() == "read_test.go":
133 foundFile = true
134 case dir.IsDir() && dir.Name() == "exec":
135 foundSubDir = true
136 }
137 }
138 if !foundFile {
139 t.Fatalf("ReadDir %s: read_test.go file not found", dirname)
140 }
141 if !foundSubDir {
142 t.Fatalf("ReadDir %s: exec directory not found", dirname)
143 }
144 }
145
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