Adds speech recognition test case to AppListStartPageWebUITest.

chrome/browser/ui/webui/app_list/start_page_browsertest.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.
 
 /**
  * TestFixture for kiosk app settings WebUI testing.
  * @extends {testing.Test}
  * @constructor
  **/
 function AppListStartPageWebUITest() {}
 
+/**
+ * Mock of audioContext.
+ * @constructor
+ */
+function mockAudioContext() {
+  this.sampleRate = 44100; /* some dummy number */
+}
+
+mockAudioContext.prototype = {
+  createMediaStreamSource: function(stream) {
+    return {connect: function(audioProc) {}};
+  },
+  createScriptProcessor: function(bufSize, channels, channels) {
+    return {connect: function(destination) {},
+            disconnect: function() {}};
+  }
+};
+
 AppListStartPageWebUITest.prototype = {
   __proto__: testing.Test.prototype,
 
   /**
    * Browser to app launcher start page.
    */
   browsePreload: 'chrome://app-list/',
 
   /**
    * Recommend apps data.
    * @private
    */
   recommendedApps_: [
     {
       'appId': 'app_id_1',
       'textTitle': 'app 1',
       'iconUrl': 'icon_url_1'
     },
     {
       'appId': 'app_id_2',
       'textTitle': 'app 2',
       'iconUrl': 'icon_url_2'
+    }
+  ],
+
+  /**
+   * Placeholder for mock speech recognizer.
+   */
+  speechRecognizer: null,
+
+  /**
+   * Sends the speech recognition result.
+   *
+   * @param {string} result The testing result.
+   * @param {boolean} isFinal Whether the result is final or not.
+   */
+  sendSpeechResult: function(result, isFinal) {
+    var speechEvent = new Event('test');
+    var transcript = [{transcript: result}];

[xiyuan, 2014/02/13 01:56:17]

You probably don't need the enclosing [] and can combine this with the next
line:

var transcript = {
  'transcript': result,
  'isFinal': isFinal
};

[Jun Mukai, 2014/02/13 02:15:25]

the speech result data is a bit tricky, but isFinal and transcript isn't in the
same level actually...
https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html#speechreco-event
SpeechRecognitionEvent holds a list of SpeechRecognitionResult objects
- each SpeechRecognitionResult object has 'isFinal' field
- each SpeechRecognitionResult object has a list of SpeechRecognitionAlternative
   - each SpeechRecognitionAlternative object has 'transcript' and 'confidence'
(my code just ignores confidence though)

So, this is actually correct, 'results' is a list of results and each result
consists of a list of alternatives.
Updated variable names slightly since 'transcript' is just wrong and misleading.

[xiyuan, 2014/02/13 02:27:16]

Thanks for the explanation.

+    transcript.isFinal = isFinal;
+    speechEvent.results = [transcript];
+    this.speechRecognizer.onresult(speechEvent);
+  },
+
+  /**
+   * Registers the webkitSpeechRecognition mock for test.
+   * @private
+   */
+  registerMockSpeechRecognition_: function() {
+    var owner = this;
+    function mockSpeechRecognition() {
+      this.inSpeech_ = false;
+      owner.speechRecognizer = this;
+    }
+
+    mockSpeechRecognition.prototype = {
+      start: function() {
+        this.onstart();
+      },
+
+      abort: function() {
+        if (this.inSpeech_)
+          this.onspeechend();
+        this.onerror(new Error());
+        this.onend();
+      }
     },
-  ],
+
+    window.webkitSpeechRecognition = mockSpeechRecognition;
+  },
+
+  /**
+   * Mock of webkitGetUserMedia for start page.
+   *
+   * @private
+   * @param {object} constraint The constraint parameter.
+   * @param {Function} success The success callback.
+   * @param {Function} error The error callback.
+   */
+  mockGetUserMedia_: function(constraint, success, error) {
+    assertTrue(constraint.audio);
+    assertNotEquals(null, error, 'error callback must not be null');
+    success();
+  },
 
   /** @override */
   preLoad: function() {
     this.makeAndRegisterMockHandler(
-        ['initialize', 'launchApp', 'setSpeechRecognitionState']);
+        ['initialize', 'launchApp',
+         'setSpeechRecognitionState', 'speechResult']);

[xiyuan, 2014/02/13 01:56:17]

nit: Reformat to one string per line.

[Jun Mukai, 2014/02/13 02:15:25]

Done.

     this.mockHandler.stubs().initialize().will(callFunction(function() {
       appList.startPage.setRecommendedApps(this.recommendedApps_);
     }.bind(this)));
     this.mockHandler.stubs().launchApp(ANYTHING);
     this.mockHandler.expects(once()).setSpeechRecognitionState('READY');
+
+    this.registerMockSpeechRecognition_();
+    window.webkitAudioContext = mockAudioContext;
+    navigator.webkitGetUserMedia = this.mockGetUserMedia_.bind(this);
   }
 };
 
 TEST_F('AppListStartPageWebUITest', 'Basic', function() {
   assertEquals(this.browsePreload, document.location.href);
 
   var recommendedApp = $('start-page').querySelector('.recommended-apps');
   assertEquals(this.recommendedApps_.length, recommendedApp.childElementCount);
   for (var i = 0; i < recommendedApp.childElementCount; ++i) {
     assertEquals(this.recommendedApps_[i].appId,
                  recommendedApp.children[i].appId);
   }
 });
 
 TEST_F('AppListStartPageWebUITest', 'ClickToLaunch', function() {
   var recommendedApp = $('start-page').querySelector('.recommended-apps');
   for (var i = 0; i < recommendedApp.childElementCount; ++i) {
     this.mockHandler.expects(once()).launchApp(
         [this.recommendedApps_[i].appId]);
     cr.dispatchSimpleEvent(recommendedApp.children[i], 'click');
   }
 });
+
+TEST_F('AppListStartPageWebUITest', 'SpeechRecognitionState', function() {
+  appList.startPage.onAppListShown();
+  this.mockHandler.expects(once()).setSpeechRecognitionState('RECOGNIZING');
+  appList.startPage.toggleSpeechRecognition();

[xiyuan, 2014/02/13 01:56:17]

Think you need to

  Mock4JS.verifyAllMocks();
  Mock4JS.clearMocksToVerify();

after this call to verify and clear the mock before continuing with the next
case.

Or split each expects() into its own test case. 

[Jun Mukai, 2014/02/13 02:15:25]

Done.

+
+  this.mockHandler.expects(once()).setSpeechRecognitionState('READY');
+  appList.startPage.toggleSpeechRecognition();
+
+  this.mockHandler.expects(once()).setSpeechRecognitionState('RECOGNIZING');
+  appList.startPage.toggleSpeechRecognition();
+
+  this.mockHandler.expects(once()).setSpeechRecognitionState('STOPPING');
+  appList.startPage.onAppListHidden();
+});
+
+TEST_F('AppListStartPageWebUITest', 'SpeechRecognition', function() {
+  appList.startPage.onAppListShown();
+  this.mockHandler.expects(once()).setSpeechRecognitionState('RECOGNIZING');
+  appList.startPage.toggleSpeechRecognition();
+
+  this.mockHandler.expects(once()).setSpeechRecognitionState('IN_SPEECH');
+  this.speechRecognizer.onspeechstart();
+
+  this.mockHandler.expects(once()).speechResult('test,false');
+  this.sendSpeechResult('test', false);
+
+  this.mockHandler.expects(once()).speechResult('test,true');
+  this.mockHandler.expects(once()).setSpeechRecognitionState('READY');
+  this.sendSpeechResult('test', true);
+});