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stub.go
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stub.go
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// Copyright 2016 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package filetesting
import (
"bytes"
"hash"
"io"
"os"
"strings"
"time"
"github.com/juju/errors"
"github.com/juju/testing"
)
type StubReader struct {
Stub *testing.Stub
ReturnRead io.Reader
}
func NewStubReader(stub *testing.Stub, content string) io.Reader {
return &StubReader{
Stub: stub,
ReturnRead: strings.NewReader(content),
}
}
func (s *StubReader) Read(data []byte) (int, error) {
s.Stub.AddCall("Read", data)
if err := s.Stub.NextErr(); err != nil {
return 0, errors.Trace(err)
}
if s.ReturnRead == nil {
return 0, nil
}
return s.ReturnRead.Read(data)
}
type StubWriter struct {
Stub *testing.Stub
ReturnWrite io.Writer
}
func NewStubWriter(stub *testing.Stub) (io.Writer, *bytes.Buffer) {
buf := new(bytes.Buffer)
s := &StubWriter{
Stub: stub,
ReturnWrite: buf,
}
return s, buf
}
func (s *StubWriter) Write(data []byte) (int, error) {
s.Stub.AddCall("Write", data)
if err := s.Stub.NextErr(); err != nil {
return 0, errors.Trace(err)
}
if s.ReturnWrite == nil {
return 0, nil
}
return s.ReturnWrite.Write(data)
}
type StubSeeker struct {
Stub *testing.Stub
ReturnSeek int64
}
func (s *StubSeeker) Seek(offset int64, whence int) (int64, error) {
s.Stub.AddCall("Seek", offset, whence)
if err := s.Stub.NextErr(); err != nil {
return 0, errors.Trace(err)
}
return s.ReturnSeek, nil
}
type StubCloser struct {
Stub *testing.Stub
}
func (s *StubCloser) Close() error {
s.Stub.AddCall("Close")
if err := s.Stub.NextErr(); err != nil {
return errors.Trace(err)
}
return nil
}
type StubFile struct {
io.Reader
io.Writer
io.Seeker
io.Closer
Stub *testing.Stub
Info StubFileInfo
}
func NewStubFile(stub *testing.Stub, raw io.ReadWriter) *StubFile {
return &StubFile{
Reader: &StubReader{Stub: stub, ReturnRead: raw},
Writer: &StubWriter{Stub: stub, ReturnWrite: raw},
Seeker: &StubSeeker{Stub: stub},
Closer: &StubCloser{Stub: stub},
Stub: stub,
}
}
func (s *StubFile) Name() string {
s.Stub.AddCall("Name")
s.Stub.NextErr() // Pop one off.
return s.Info.Info.Name
}
func (s *StubFile) Stat() (os.FileInfo, error) {
s.Stub.AddCall("Stat")
if err := s.Stub.NextErr(); err != nil {
return nil, errors.Trace(err)
}
return &s.Info, nil
}
func (s *StubFile) Sync() error {
s.Stub.AddCall("Sync")
if err := s.Stub.NextErr(); err != nil {
return errors.Trace(err)
}
return nil
}
func (s *StubFile) Truncate(size int64) error {
s.Stub.AddCall("Truncate", size)
if err := s.Stub.NextErr(); err != nil {
return errors.Trace(err)
}
return nil
}
type FileInfo struct {
Name string
Size int64
Mode os.FileMode
ModTime time.Time
}
var _ os.FileInfo = (*StubFileInfo)(nil)
type StubFileInfo struct {
Stub *testing.Stub
Info FileInfo
ReturnSys interface{}
}
func NewStubFileInfo(stub *testing.Stub, name, content string) *StubFileInfo {
return &StubFileInfo{
Stub: stub,
Info: FileInfo{
Name: name,
Size: int64(len(content)),
Mode: 0644,
ModTime: time.Now(),
},
}
}
func (s StubFileInfo) Name() string {
s.Stub.AddCall("Name")
s.Stub.NextErr() // Pop one off.
return s.Info.Name
}
func (s StubFileInfo) Size() int64 {
s.Stub.AddCall("Size")
s.Stub.NextErr() // Pop one off.
return s.Info.Size
}
func (s StubFileInfo) Mode() os.FileMode {
s.Stub.AddCall("Mode")
s.Stub.NextErr() // Pop one off.
return s.Info.Mode
}
func (s StubFileInfo) ModTime() time.Time {
s.Stub.AddCall("ModTime")
s.Stub.NextErr() // Pop one off.
return s.Info.ModTime
}
func (s StubFileInfo) IsDir() bool {
s.Stub.AddCall("IsDir")
s.Stub.NextErr() // Pop one off.
return s.Info.Mode.IsDir()
}
func (s StubFileInfo) Sys() interface{} {
s.Stub.AddCall("Sys")
s.Stub.NextErr() // Pop one off.
return s.ReturnSys
}
var _ hash.Hash = (*StubHash)(nil)
type StubHash struct {
io.Writer
Stub *testing.Stub
ReturnSum []byte
ReturnSize int
ReturnBlockSize int
}
func NewStubHash(stub *testing.Stub, raw io.Writer) *StubHash {
return &StubHash{
Writer: &StubWriter{Stub: stub, ReturnWrite: raw},
Stub: stub,
}
}
func (s *StubHash) Sum(b []byte) []byte {
s.Stub.AddCall("Sum", b)
s.Stub.NextErr() // Pop one off.
return s.ReturnSum
}
func (s *StubHash) Reset() {
s.Stub.AddCall("Reset")
s.Stub.NextErr() // Pop one off.
}
func (s *StubHash) Size() int {
s.Stub.AddCall("Size")
s.Stub.NextErr() // Pop one off.
return s.ReturnSize
}
func (s *StubHash) BlockSize() int {
s.Stub.AddCall("BlockSize")
s.Stub.NextErr() // Pop one off.
return s.ReturnBlockSize
}