syncthing/lib/fs/fakefs_test.go

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// Copyright (C) 2018 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package fs
import (
"bytes"
"io/ioutil"
"os"
"testing"
)
func TestFakeFS(t *testing.T) {
// Test some basic aspects of the fakefs
fs := newFakeFilesystem("/foo/bar/baz")
// MkdirAll
err := fs.MkdirAll("dira/dirb", 0755)
if err != nil {
t.Fatal(err)
}
info, err := fs.Stat("dira/dirb")
if err != nil {
t.Fatal(err)
}
// Mkdir
err = fs.Mkdir("dira/dirb/dirc", 0755)
if err != nil {
t.Fatal(err)
}
info, err = fs.Stat("dira/dirb/dirc")
if err != nil {
t.Fatal(err)
}
// Create
fd, err := fs.Create("/dira/dirb/test")
if err != nil {
t.Fatal(err)
}
// Write
_, err = fd.Write([]byte("hello"))
if err != nil {
t.Fatal(err)
}
// Stat on fd
info, err = fd.Stat()
if err != nil {
t.Fatal(err)
}
if info.Name() != "test" {
t.Error("wrong name:", info.Name())
}
if info.Size() != 5 {
t.Error("wrong size:", info.Size())
}
// Stat on fs
info, err = fs.Stat("dira/dirb/test")
if err != nil {
t.Fatal(err)
}
if info.Name() != "test" {
t.Error("wrong name:", info.Name())
}
if info.Size() != 5 {
t.Error("wrong size:", info.Size())
}
// Seek
_, err = fd.Seek(1, os.SEEK_SET)
if err != nil {
t.Fatal(err)
}
// Read
bs0, err := ioutil.ReadAll(fd)
if err != nil {
t.Fatal(err)
}
if len(bs0) != 4 {
t.Error("wrong number of bytes:", len(bs0))
}
// Read again, same data hopefully
_, err = fd.Seek(0, os.SEEK_SET)
if err != nil {
t.Fatal(err)
}
bs1, err := ioutil.ReadAll(fd)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(bs0, bs1[1:]) {
t.Error("wrong data")
}
}
func TestFakeFSRead(t *testing.T) {
// Test some basic aspects of the fakefs
fs := newFakeFilesystem("/foo/bar/baz")
// Create
fd, _ := fs.Create("test")
fd.Truncate(3 * 1 << randomBlockShift)
// Read
fd.Seek(0, 0)
bs0, err := ioutil.ReadAll(fd)
if err != nil {
t.Fatal(err)
}
if len(bs0) != 3*1<<randomBlockShift {
t.Error("wrong number of bytes:", len(bs0))
}
// Read again, starting at an odd offset
fd.Seek(0, 0)
buf0 := make([]byte, 12345)
n, _ := fd.Read(buf0)
if n != len(buf0) {
t.Fatal("short read")
}
buf1, err := ioutil.ReadAll(fd)
if err != nil {
t.Fatal(err)
}
if len(buf1) != 3*1<<randomBlockShift-len(buf0) {
t.Error("wrong number of bytes:", len(buf1))
}
bs1 := append(buf0, buf1...)
if !bytes.Equal(bs0, bs1) {
t.Error("data mismatch")
}
// Read large block with ReadAt
bs2 := make([]byte, 3*1<<randomBlockShift)
_, err = fd.ReadAt(bs2, 0)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(bs0, bs2) {
t.Error("data mismatch")
}
}