Files.app: Add a deduplication step to avoid importing duplicate media.

ui/file_manager/file_manager/foreground/js/navigation_list_model_unittest.js

Index: ui/file_manager/file_manager/foreground/js/navigation_list_model_unittest.js
diff --git a/ui/file_manager/file_manager/foreground/js/navigation_list_model_unittest.js b/ui/file_manager/file_manager/foreground/js/navigation_list_model_unittest.js
index 62e92a269c7ceb7dd4fc94e7cdc4611d3cb43361..4886eb6aca7f45b4699505d9447f628ee9e9d219 100644
--- a/ui/file_manager/file_manager/foreground/js/navigation_list_model_unittest.js
+++ b/ui/file_manager/file_manager/foreground/js/navigation_list_model_unittest.js
@@ -2,21 +2,31 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-function setUp() {
-  // Set up string assets.
-  loadTimeData.data = {
-    DRIVE_DIRECTORY_LABEL: 'My Drive',
-    DOWNLOADS_DIRECTORY_LABEL: 'Downloads'
-  };
+/** @type {!MockFileSystem} Simulate the drive file system. */
+var drive;
+
+/** @type {!MockFileSystem} Simulate a removable volume. */
+var hoge;
+
+// Set up string assets.
+loadTimeData.data = {
+  DRIVE_DIRECTORY_LABEL: 'My Drive',
+  DOWNLOADS_DIRECTORY_LABEL: 'Downloads'
+};
 
+function setUp() {
   // Override VolumeInfo.prototype.resolveDisplayRoot.
   VolumeInfo.prototype.resolveDisplayRoot = function() {};
+
+  drive = new MockFileSystem('drive');
+  hoge = new MockFileSystem('removable:hoge');
+
 }
 
 function testModel() {
   var volumeManager = new MockVolumeManagerWrapper();
   var shortcutListModel = new MockFolderShortcutDataModel(
-      [new MockFileEntry('drive', '/root/shortcut')]);
+      [new MockFileEntry(drive, '/root/shortcut')]);
   var model = new NavigationListModel(volumeManager, shortcutListModel);
 
   assertEquals(3, model.length);
@@ -28,18 +38,18 @@ function testModel() {
 function testAddAndRemoveShortcuts() {
   var volumeManager = new MockVolumeManagerWrapper();
   var shortcutListModel = new MockFolderShortcutDataModel(
-      [new MockFileEntry('drive', '/root/shortcut')]);
+      [new MockFileEntry(drive, '/root/shortcut')]);
   var model = new NavigationListModel(volumeManager, shortcutListModel);
 
   assertEquals(3, model.length);
 
   // Add a shortcut at the tail.
-  shortcutListModel.splice(1, 0, new MockFileEntry('drive', '/root/shortcut2'));
+  shortcutListModel.splice(1, 0, new MockFileEntry(drive, '/root/shortcut2'));
   assertEquals(4, model.length);
   assertEquals('/root/shortcut2', model.item(3).entry.fullPath);
 
   // Add a shortcut at the head.
-  shortcutListModel.splice(0, 0, new MockFileEntry('drive', '/root/hoge'));
+  shortcutListModel.splice(0, 0, new MockFileEntry(drive, '/root/hoge'));
   assertEquals(5, model.length);
   assertEquals('/root/hoge', model.item(2).entry.fullPath);
   assertEquals('/root/shortcut', model.item(3).entry.fullPath);
@@ -60,7 +70,7 @@ function testAddAndRemoveShortcuts() {
 function testAddAndRemoveVolumes() {
   var volumeManager = new MockVolumeManagerWrapper();
   var shortcutListModel = new MockFolderShortcutDataModel(
-      [new MockFileEntry('drive', '/root/shortcut')]);
+      [new MockFileEntry(drive, '/root/shortcut')]);
   var model = new NavigationListModel(volumeManager, shortcutListModel);
 
   assertEquals(3, model.length);
@@ -88,7 +98,7 @@ function testAddAndRemoveVolumes() {
 
   // A shortcut is created on the 'hoge' volume.
   shortcutListModel.splice(
-      1, 0, new MockFileEntry('removable:hoge', '/shortcut2'));
+      1, 0, new MockFileEntry(hoge, '/shortcut2'));
   assertEquals(6, model.length);
   assertEquals('drive', model.item(0).volumeInfo.volumeId);
   assertEquals('downloads', model.item(1).volumeInfo.volumeId);