Initial support for Ranges over automation nodes (used to track ChromeVox focus).

chrome/browser/resources/chromeos/chromevox/cvox2/background/background_test.extjs

 // Copyright 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.
 
 // Include test fixture.
 GEN_INCLUDE(['../../testing/chromevox_next_e2e_test_base.js']);
 
 GEN_INCLUDE(['../../testing/mock_tts.js']);
 
 /**
@@ skipping 53 matching lines @@
     <p>start
     <p>end
   */},
   function() {
     cvox.ChromeVox.tts.expectSpeech('start', function() {
       global.backgroundObj.onGotCommand('nextLine');
     });
     cvox.ChromeVox.tts.expectSpeech('end', testDone);
   }.bind(this));
 });
+
+/** Tests consistency of navigating forward and backward. */
+TEST_F('BackgroundTest', 'ForwardBackwardNavigation', function() {
+  this.runWithDocument(function() {/*!
+    <p>start</p>
+    <a href='#a'>alpha</a>
+    <a href='#b'>beta</a>
+    <p>
+      <h1>charlie</h1>
+      <a href='foo'>delta</a>
+    </p>
+    <a href='#bar'>echo</a>
+    <h2>foxtraut</h2>
+    <p>end<span>of test</span></p>
+  */},
+  function() {
+    var doCmd = function(cmd) {
+      return function() {
+        global.backgroundObj.onGotCommand(cmd);
+      };
+    };
+
+    var expectAfter =
+        cvox.ChromeVox.tts.expectSpeechAfter.bind(cvox.ChromeVox.tts);
+
+    cvox.ChromeVox.tts.expectSpeech('start');
+    expectAfter('alpha', doCmd('nextLink'));
+    expectAfter('beta', doCmd('nextLink'));
+    expectAfter('delta', doCmd('nextLink'));
+    expectAfter('beta', doCmd('previousLink'));
+
+    expectAfter('charlie', doCmd('nextHeading'));
+    expectAfter('foxtraut', doCmd('nextHeading'));
+    expectAfter('charlie', doCmd('previousHeading'));
+
+    expectAfter('delta', doCmd('nextElement'));
+    expectAfter('echo', doCmd('nextElement'));
+    expectAfter('foxtraut', doCmd('nextElement'));
+    expectAfter('end', doCmd('nextElement'));
+    expectAfter('foxtraut', doCmd('previousElement'));
+
+    // TODO(dtseng): cleanup these utterances.
+    expectAfter(', end, paragraph, of test, paragraph', doCmd('nextLine'));
+
+    expectAfter('start', doCmd('goToBeginning'));
+    expectAfter('of test', doCmd('goToEnd'));
+
+    cvox.ChromeVox.tts.finishExpectations();
+  }.bind(this));
+});