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  	"runtime"
    13  	"testing"
    14  )
    15  
    16  func checkSize(t *testing.T, path string, size int64) {
    17  	dir, err := os.Stat(path)
    18  	if err != nil {
    19  		t.Fatalf("Stat %q (looking for size %d): %s", path, size, err)
    20  	}
    21  	if dir.Size() != size {
    22  		t.Errorf("Stat %q: size %d want %d", path, dir.Size(), size)
    23  	}
    24  }
    25  
    26  func TestReadFile(t *testing.T) {
    27  	filename := "rumpelstilzchen"
    28  	contents, err := ReadFile(filename)
    29  	if err == nil {
    30  		t.Fatalf("ReadFile %s: error expected, none found", filename)
    31  	}
    32  
    33  	filename = "ioutil_test.go"
    34  	contents, err = ReadFile(filename)
    35  	if err != nil {
    36  		t.Fatalf("ReadFile %s: %v", filename, err)
    37  	}
    38  
    39  	checkSize(t, filename, int64(len(contents)))
    40  }
    41  
    42  func TestWriteFile(t *testing.T) {
    43  	f, err := TempFile("", "ioutil-test")
    44  	if err != nil {
    45  		t.Fatal(err)
    46  	}
    47  	filename := f.Name()
    48  	data := "Programming today is a race between software engineers striving to " +
    49  		"build bigger and better idiot-proof programs, and the Universe trying " +
    50  		"to produce bigger and better idiots. So far, the Universe is winning."
    51  
    52  	if err := WriteFile(filename, []byte(data), 0644); err != nil {
    53  		t.Fatalf("WriteFile %s: %v", filename, err)
    54  	}
    55  
    56  	contents, err := ReadFile(filename)
    57  	if err != nil {
    58  		t.Fatalf("ReadFile %s: %v", filename, err)
    59  	}
    60  
    61  	if string(contents) != data {
    62  		t.Fatalf("contents = %q\nexpected = %q", string(contents), data)
    63  	}
    64  
    65  	// cleanup
    66  	f.Close()
    67  	os.Remove(filename) // ignore error
    68  }
    69  
    70  func TestReadOnlyWriteFile(t *testing.T) {
    71  	if os.Getuid() == 0 {
    72  		t.Skipf("Root can write to read-only files anyway, so skip the read-only test.")
    73  	}
    74  	if runtime.GOOS == "wasip1" {
    75  		t.Skip("file permissions are not supported by wasip1")
    76  	}
    77  
    78  	// We don't want to use TempFile directly, since that opens a file for us as 0600.
    79  	tempDir, err := TempDir("", t.Name())
    80  	if err != nil {
    81  		t.Fatalf("TempDir %s: %v", t.Name(), err)
    82  	}
    83  	defer os.RemoveAll(tempDir)
    84  	filename := filepath.Join(tempDir, "blurp.txt")
    85  
    86  	shmorp := []byte("shmorp")
    87  	florp := []byte("florp")
    88  	err = WriteFile(filename, shmorp, 0444)
    89  	if err != nil {
    90  		t.Fatalf("WriteFile %s: %v", filename, err)
    91  	}
    92  	err = WriteFile(filename, florp, 0444)
    93  	if err == nil {
    94  		t.Fatalf("Expected an error when writing to read-only file %s", filename)
    95  	}
    96  	got, err := ReadFile(filename)
    97  	if err != nil {
    98  		t.Fatalf("ReadFile %s: %v", filename, err)
    99  	}
   100  	if !bytes.Equal(got, shmorp) {
   101  		t.Fatalf("want %s, got %s", shmorp, got)
   102  	}
   103  }
   104  
   105  func TestReadDir(t *testing.T) {
   106  	dirname := "rumpelstilzchen"
   107  	_, err := ReadDir(dirname)
   108  	if err == nil {
   109  		t.Fatalf("ReadDir %s: error expected, none found", dirname)
   110  	}
   111  
   112  	dirname = ".."
   113  	list, err := ReadDir(dirname)
   114  	if err != nil {
   115  		t.Fatalf("ReadDir %s: %v", dirname, err)
   116  	}
   117  
   118  	foundFile := false
   119  	foundSubDir := false
   120  	for _, dir := range list {
   121  		switch {
   122  		case !dir.IsDir() && dir.Name() == "io_test.go":
   123  			foundFile = true
   124  		case dir.IsDir() && dir.Name() == "ioutil":
   125  			foundSubDir = true
   126  		}
   127  	}
   128  	if !foundFile {
   129  		t.Fatalf("ReadDir %s: io_test.go file not found", dirname)
   130  	}
   131  	if !foundSubDir {
   132  		t.Fatalf("ReadDir %s: ioutil directory not found", dirname)
   133  	}
   134  }
   135
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