Add an unittest for background/volume_manager.js

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

Index: chrome/test/data/file_manager/unit_tests/mocks/mock_entry.js
diff --git a/chrome/test/data/file_manager/unit_tests/mocks/mock_entry.js b/chrome/test/data/file_manager/unit_tests/mocks/mock_entry.js
index 9c0b5924ec5845346d19439d5de0b9a0ec268831..36759dad73271383c89c267204a8ee71b1845797 100644
--- a/chrome/test/data/file_manager/unit_tests/mocks/mock_entry.js
+++ b/chrome/test/data/file_manager/unit_tests/mocks/mock_entry.js
@@ -45,6 +45,9 @@ MockEntry.prototype = {
    */
   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;
   }
 };
 
@@ -54,7 +57,11 @@ MockEntry.prototype = {
  * @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;
+  }
 };
 
 /**
@@ -212,3 +219,23 @@ MockDirectoryEntry.prototype.getDirectory =
   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();
+}