// 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 ioutil_test import ( "bytes" . "io/ioutil" "os" "path/filepath" "runtime" "testing" ) func checkSize(t *testing.T, path string, size int64) { dir, err := os.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 = "ioutil_test.go" contents, err = ReadFile(filename) if err != nil { t.Fatalf("ReadFile %s: %v", filename, err) } checkSize(t, filename, int64(len(contents))) } func TestWriteFile(t *testing.T) { f, err := TempFile("", "ioutil-test") if err != nil { t.Fatal(err) } filename := f.Name() data := "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(filename, []byte(data), 0644); err != nil { t.Fatalf("WriteFile %s: %v", filename, err) } contents, err := ReadFile(filename) if err != nil { t.Fatalf("ReadFile %s: %v", filename, err) } if string(contents) != data { t.Fatalf("contents = %q\nexpected = %q", string(contents), data) } // cleanup f.Close() os.Remove(filename) // ignore error } func TestReadOnlyWriteFile(t *testing.T) { if os.Getuid() == 0 { t.Skipf("Root can write to read-only files anyway, so skip the read-only test.") } if runtime.GOOS == "wasip1" { t.Skip("file permissions are not supported by wasip1") } // We don't want to use TempFile directly, since that opens a file for us as 0600. tempDir, err := TempDir("", t.Name()) if err != nil { t.Fatalf("TempDir %s: %v", t.Name(), err) } defer os.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() == "io_test.go": foundFile = true case dir.IsDir() && dir.Name() == "ioutil": foundSubDir = true } } if !foundFile { t.Fatalf("ReadDir %s: io_test.go file not found", dirname) } if !foundSubDir { t.Fatalf("ReadDir %s: ioutil directory not found", dirname) } }