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

chrome/test/data/extensions/api_test/file_manager_browsertest/background.js

 // Copyright (c) 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.
 
 'use strict';
 
 /**
  * Extension ID of Files.app.
  * @type {string}
  * @const
@@ skipping 322 matching lines @@
   return repeatUntil(function() {
     return callRemoteTestUtil('getExecutedTasks', windowId, []).
         then(function(executedTasks) {
           if (executedTasks.indexOf(taskId) === -1)
             return pending('Executed task is %j', executedTasks);
         });
   });
 }
 
 /**
+ * Sends fake key down event.

[mtomasz, 2014/04/09 03:38:54]

nit: fake -> a fake

[hirono, 2014/04/09 20:01:13]

Done.

+ * @param {string} windowId Window ID.
+ * @param {string} query Query for target element.

[mtomasz, 2014/04/09 03:38:54]

nit: target -> the target

[hirono, 2014/04/09 20:01:13]

Done.

+ * @param {string} keyIdentifer Key identifier.
+ * @param {boolean} ctrlKey Control key flag.
+ * @return {Promise} Promise to be fulfilled or rejected depending on the
+ *     result.
+ */
+function fakeKeyDown(windowId, query, keyIdentifer, ctrlKey) {
+  return new Promise(function(fulfill, reject) {
+    callRemoteTestUtil('fakeKeyDown',
+                       windowId,
+                       [query, keyIdentifer, ctrlKey],
+                       function(result) {
+                         if (result)
+                           fulfill();
+                         else
+                           reject(new Error('Fail to fake key down.'));
+                       });
+  });
+}
+
+/**
  * Executes a sequence of test steps.
  * @constructor
  */
 function StepsRunner() {
   /**
    * List of steps.
    * @type {Array.<function>}
    * @private
    */
   this.steps_ = [];
@@ skipping 361 matching lines @@
     }
   ]);
 }
 
 /**
  * Verifies if there are no Javascript errors in any of the app windows.
  * @param {function()} Completion callback.
  */
 function checkIfNoErrorsOccured(callback) {
   callRemoteTestUtil('getErrorCount', null, [], function(count) {
-    chrome.test.assertEq(0, count);
+    chrome.test.assertEq(0, count, 'The error count is not 0.');
     callback();
   });
 }
 
 /**
  * Returns the name of the given file list entry.
  * @param {Array.<string>} file An entry in a file list.
  * @return {string} Name of the file.
  */
 function getFileName(fileListEntry) {
@@ skipping 52 matching lines @@
         chrome.test.runTests([function() {
           chrome.test.fail(testCaseName + ' is not found.');
         }]);
         return;
       }
       chrome.test.runTests([testcase[testCaseName]]);
     }
   ];
   steps.shift()();
 });