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-rw-r--r--src/os/read_test.go127
1 files changed, 127 insertions, 0 deletions
diff --git a/src/os/read_test.go b/src/os/read_test.go
new file mode 100644
index 0000000..5c58d7d
--- /dev/null
+++ b/src/os/read_test.go
@@ -0,0 +1,127 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os_test
+
+import (
+ "bytes"
+ . "os"
+ "path/filepath"
+ "testing"
+)
+
+func checkNamedSize(t *testing.T, path string, size int64) {
+ dir, err := Stat(path)
+ if err != nil {
+ t.Fatalf("Stat %q (looking for size %d): %s", path, size, err)
+ }
+ if dir.Size() != size {
+ t.Errorf("Stat %q: size %d want %d", path, dir.Size(), size)
+ }
+}
+
+func TestReadFile(t *testing.T) {
+ filename := "rumpelstilzchen"
+ contents, err := ReadFile(filename)
+ if err == nil {
+ t.Fatalf("ReadFile %s: error expected, none found", filename)
+ }
+
+ filename = "read_test.go"
+ contents, err = ReadFile(filename)
+ if err != nil {
+ t.Fatalf("ReadFile %s: %v", filename, err)
+ }
+
+ checkNamedSize(t, filename, int64(len(contents)))
+}
+
+func TestWriteFile(t *testing.T) {
+ f, err := CreateTemp("", "ioutil-test")
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer f.Close()
+ defer Remove(f.Name())
+
+ msg := "Programming today is a race between software engineers striving to " +
+ "build bigger and better idiot-proof programs, and the Universe trying " +
+ "to produce bigger and better idiots. So far, the Universe is winning."
+
+ if err := WriteFile(f.Name(), []byte(msg), 0644); err != nil {
+ t.Fatalf("WriteFile %s: %v", f.Name(), err)
+ }
+
+ data, err := ReadFile(f.Name())
+ if err != nil {
+ t.Fatalf("ReadFile %s: %v", f.Name(), err)
+ }
+
+ if string(data) != msg {
+ t.Fatalf("ReadFile: wrong data:\nhave %q\nwant %q", string(data), msg)
+ }
+}
+
+func TestReadOnlyWriteFile(t *testing.T) {
+ if Getuid() == 0 {
+ t.Skipf("Root can write to read-only files anyway, so skip the read-only test.")
+ }
+
+ // We don't want to use CreateTemp directly, since that opens a file for us as 0600.
+ tempDir, err := MkdirTemp("", t.Name())
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer RemoveAll(tempDir)
+ filename := filepath.Join(tempDir, "blurp.txt")
+
+ shmorp := []byte("shmorp")
+ florp := []byte("florp")
+ err = WriteFile(filename, shmorp, 0444)
+ if err != nil {
+ t.Fatalf("WriteFile %s: %v", filename, err)
+ }
+ err = WriteFile(filename, florp, 0444)
+ if err == nil {
+ t.Fatalf("Expected an error when writing to read-only file %s", filename)
+ }
+ got, err := ReadFile(filename)
+ if err != nil {
+ t.Fatalf("ReadFile %s: %v", filename, err)
+ }
+ if !bytes.Equal(got, shmorp) {
+ t.Fatalf("want %s, got %s", shmorp, got)
+ }
+}
+
+func TestReadDir(t *testing.T) {
+ dirname := "rumpelstilzchen"
+ _, err := ReadDir(dirname)
+ if err == nil {
+ t.Fatalf("ReadDir %s: error expected, none found", dirname)
+ }
+
+ dirname = "."
+ list, err := ReadDir(dirname)
+ if err != nil {
+ t.Fatalf("ReadDir %s: %v", dirname, err)
+ }
+
+ foundFile := false
+ foundSubDir := false
+ for _, dir := range list {
+ switch {
+ case !dir.IsDir() && dir.Name() == "read_test.go":
+ foundFile = true
+ case dir.IsDir() && dir.Name() == "exec":
+ foundSubDir = true
+ }
+ }
+ if !foundFile {
+ t.Fatalf("ReadDir %s: read_test.go file not found", dirname)
+ }
+ if !foundSubDir {
+ t.Fatalf("ReadDir %s: exec directory not found", dirname)
+ }
+}