Files.app: Reland r261616: Add a test to rename a file.

chrome/browser/resources/file_manager/background/js/test_util.js

 // Copyright (c) 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.
 
 /**
  * Namespace for test related things.
  */
 var test = test || {};
 
 /**
@@ skipping 211 matching lines @@
 };
 
 /**
  * Fakes pressing the down arrow until the given |filename| is selected.
  *
  * @param {Window} contentWindow Window to be tested.
  * @param {string} filename Name of the file to be selected.
  * @return {boolean} True if file got selected, false otherwise.
  */
 test.util.sync.selectFile = function(contentWindow, filename) {
-  var table = contentWindow.document.querySelector('#detail-table');
-  var rows = table.querySelectorAll('li');
+  var rows = contentWindow.document.querySelectorAll('#detail-table li');
+  test.util.sync.fakeKeyDown(contentWindow, '#file-list', 'Home', false);
   for (var index = 0; index < rows.length; ++index) {
-    test.util.sync.fakeKeyDown(contentWindow, '#file-list', 'Down', false);
     var selection = test.util.sync.getSelectedFiles(contentWindow);
     if (selection.length === 1 && selection[0] === filename)
       return true;
+    test.util.sync.fakeKeyDown(contentWindow, '#file-list', 'Down', false);
   }
   console.error('Failed to select file "' + filename + '"');
   return false;
 };
 
 /**
  * Open the file by selectFile and fakeMouseDoubleClick.
  *
  * @param {Window} contentWindow Window to be tested.
  * @param {string} filename Name of the file to be opened.
@@ skipping 413 matching lines @@
       return false;
     } else {
       console.error('Invalid function name.');
       return false;
     }
   });
 };
 
 // Register the test utils.
 test.util.registerRemoteTestUtils();