Add an unittest for background/volume_manager.js

chrome/test/data/file_manager/unit_tests/mocks/mock_entry.js

 // 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.
 
 /**
  * Joins paths so that the two paths are connected by only 1 '/'.
  * @param {string} a Path.
  * @param {string} b Path.
  * @return {string} Joined path.
  */
@@ skipping 27 matching lines @@
   this.filesystem = filesystem;
   this.fullPath = fullPath;
 }
 
 MockEntry.prototype = {
   /**
    * @return {string} Name of the entry.
    */
   get name() {
     return this.fullPath.replace(/^.*\//, '');
+  },
+  get fileSystem() {

[hirono, 2014/10/24 07:12:21]

Is it needed? We already have filesystem property.

[yawano, 2014/10/27 00:25:08]

Sorry, this method was unnecessary. I deleted.

+    return this.filesystem;
   }
 };
 
 /**
  * Returns fake URL.
  *
  * @return {string} Fake URL.
  */
 MockEntry.prototype.toURL = function() {
-  return 'filesystem:' + this.filesystem.fileSystemId + this.fullPath;
+  if(this.filesystem.fileSystemId) {
+    return 'filesystem:' + this.filesystem.fileSystemId + this.fullPath;
+  } else {
+    return 'filesystem:' + this.filesystem.name + this.fullPath;
+  }
 };
 
 /**
  * Obtains parent directory.
  *
  * @param {function(MockDirectoryEntry)} onSuccess Callback invoked with
  *     the parent directory.
  * @param {function(Object)} onError Callback invoked with an error
  *     object.
  */
@@ skipping 137 matching lines @@
 MockDirectoryEntry.prototype.getDirectory =
     function(path, option, onSuccess, onError) {
   var fullPath = path[0] === '/' ? path : joinPath(this.fullPath, path);
   if (!this.filesystem.entries[fullPath])
     onError({name: util.FileError.NOT_FOUND_ERR});
   else if (!(this.filesystem.entries[fullPath] instanceof MockDirectoryEntry))
     onError({name: util.FileError.TYPE_MISMATCH_ERR});
   else
     onSuccess(this.filesystem.entries[fullPath]);
 };
+
+/**
+ * Creates a MockDirectoryReader for the entry.
+ */
+MockDirectoryEntry.prototype.createReader = function() {
+  return new MockDirectoryReader();
+}
+
+/**
+ * Mock class for DirectoryReader.
+ */
+function MockDirectoryReader() {}
+
+/**
+ * Reads entries.
+ * Current implementation just calls success callback.
+ */
+MockDirectoryReader.prototype.readEntries = function(success, error) {
+  success();
+}