[Files.app] Add an unittest of NavigationListModel

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

+// Copyright 2013 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.
+
+/**
+ * Mock class for VolumeManager.
+ * @constructor
+ */
+function MockVolumeManager() {
+  this.volumeInfoList = new cr.ui.ArrayDataModel([]);
+
+  this.volumeInfoList.push(MockVolumeManager.createMockVolumeInfo(
+      util.VolumeType.DRIVE, '/drive'));
+  this.volumeInfoList.push(MockVolumeManager.createMockVolumeInfo(
+      util.VolumeType.DOWNLOADS, '/Downloads'));
+}
+
+/**
+ * Returns the corresponding VolumeInfo.
+ * @param {string} mountPath Path to be looking for with.
+ * @return {VolumeInfo} Corresponding VolumeInfo.
+ */
+MockVolumeManager.prototype.getVolumeInfo = function(mountPath) {
+  for (var i = 0; i < this.volumeInfoList.length; i++) {
+    if (this.volumeInfoList.item(i).mountPath === mountPath)
+      return this.volumeInfoList.item(i);
+  }
+  return null;
+};
+
+/**
+ * Resolve FileEntry.
+ * @param {string} path
+ * @param {function(FileEntry)} successCallback Callback on success.
+ * @param {function()} errorCallback Callback on error.
+ */
+MockVolumeManager.prototype.resolvePath = function(
+    path, successCallback, errorCallback) {
+  var mockFileEntry = new MockFileEntry();
+  mockFileEntry.fullPath = path;
+  successCallback(mockFileEntry);
+};
+
+/**
+ * Utility function to create a mock VolumeInfo.
+ * @param {VolumeType} type Volume type.
+ * @param {string} path Volume path.
+ * @return {VolumeInfo} Created mock VolumeInfo.
+ */
+MockVolumeManager.createMockVolumeInfo = function(type, path) {
+  var entry = new MockFileEntry();
+  entry.fullPath = path;
+
+  var volumeInfo = new VolumeInfo(
+      type,
+      path,
+      entry,  // Directory entry.
+      '',  // error
+      '',  // deviceType
+      false);  // readonly
+
+  return volumeInfo;
+};