cipd: Extract high level file system operations into the separate interface.

go/src/infra/tools/cipd/local/files_test.go

 // Copyright 2014 The Chromium 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 local
 
 import (
         "io/ioutil"
         "os"
         "path/filepath"
@@ skipping 245 matching lines @@
         discoveredTarget, err := file.SymlinkTarget()
         So(err, ShouldBeNil)
         So(discoveredTarget, ShouldEqual, target)
 }
 
 func TestFileSystemDestination(t *testing.T) {
         Convey("Given a temp directory", t, func() {
                 tempDir, err := ioutil.TempDir("", "cipd_test")
                 destDir := filepath.Join(tempDir, "dest")
                 So(err, ShouldBeNil)
-                dest := NewFileSystemDestination(destDir)
+                dest := NewFileSystemDestination(destDir, nil)
                 Reset(func() { os.RemoveAll(tempDir) })
 
                 writeFileToDest := func(name string, executable bool, data string) {
                         writer, err := dest.CreateFile(name, executable)
                         if writer != nil {
                                 defer writer.Close()
                         }
                         So(err, ShouldBeNil)
                         _, err = writer.Write([]byte(data))
                         So(err, ShouldBeNil)
@@ skipping 188 matching lines @@
                         So(dest.Begin(), ShouldBeNil)
                         w, err := dest.CreateFile("a", false)
                         So(w, ShouldNotBeNil)
                         So(err, ShouldBeNil)
                         So(dest.End(true), ShouldNotBeNil)
                         w.Close()
                         So(dest.End(true), ShouldBeNil)
                 })
         })
 }