Add a test that verifies the DNS prefetching preference

chrome/test/functional/prefs.py

 #!/usr/bin/python
 # Copyright (c) 2010 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.
 
 import logging
 import os
 import shutil
 import sys
 
@@ skipping 102 matching lines @@
     self.SetPrefs(pyauto.kShowHomeButton, True)
     if self.IsMac():     # win/linux don't have the
       self.assertFalse(  # "browser.show_page_options_buttons" pref
           self.GetPrefsInfo().Prefs(pyauto.kShowPageOptionsButtons))
       self.SetPrefs(pyauto.kShowPageOptionsButtons, True)
     self.RestartBrowser(clear_profile=False)
     self.assertTrue(self.GetPrefsInfo().Prefs(pyauto.kShowHomeButton))
     if self.IsMac():
       self.assertTrue(self.GetPrefsInfo().Prefs(pyauto.kShowPageOptionsButtons))
 
+  def testDnsPrefectchingEnabledPref(self):
+    """Verify DNS prefetching pref"""
+    # Assert default
+    self.assertTrue(self.GetPrefsInfo().Prefs(pyauto.kDnsPrefetchingEnabled))
+    self.SetPrefs(pyauto.kDnsPrefetchingEnabled, False)
+    self.RestartBrowser(clear_profile=False)
+    self.assertFalse(self.GetPrefsInfo().Prefs(pyauto.kDnsPrefetchingEnabled))
+
   def testHomepagePrefs(self):
     """Verify homepage prefs."""
     # "Use the New Tab page"
     self.SetPrefs(pyauto.kHomePageIsNewTabPage, True)
     logging.debug('Setting %s to 1' % pyauto.kHomePageIsNewTabPage)
     self.RestartBrowser(clear_profile=False)
     self.assertEqual(self.GetPrefsInfo().Prefs(pyauto.kHomePageIsNewTabPage),
                      True)
     # "Open this page"
     url = self.GetFileURLForPath(os.path.join(self.DataDir(), 'title1.html'))
     self.SetPrefs(pyauto.kHomePage, url)
     self.SetPrefs(pyauto.kHomePageIsNewTabPage, False)
     self.RestartBrowser(clear_profile=False)
     self.assertEqual(self.GetPrefsInfo().Prefs(pyauto.kHomePage), url)
     self.assertFalse(self.GetPrefsInfo().Prefs(pyauto.kHomePageIsNewTabPage))
     # TODO(nirnimesh): Actually verify that homepage loads.
     # This requires telling pyauto *not* to set about:blank as homepage.
 
 
 if __name__ == '__main__':
   pyauto_functional.Main()