Added a new PyAuto method WaitForDomNode() which allows tests to block until a specified node exist…

chrome/test/functional/apptest.py

 # Copyright (c) 2012 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 pyauto_functional  # must be imported before pyauto
 import pyauto
 import domselector
 
 class PyAutoEventsTest(pyauto.PyUITest):
   """Tests using the event queue."""
 
   def testBasicEvents(self):
     """Basic test for the event queue."""
     url = self.GetHttpURLForDataPath('apptest', 'basic.html')
     driver = self.NewWebDriver()
     event_id = self.AddDomEventObserver(automation_id=4444, recurring=True)
     success_id = self.AddDomEventObserver('test success', automation_id=4444)
     self.NavigateToURL(url)
     self._ExpectEvent(event_id, 'init')
     self._ExpectEvent(event_id, 'login ready')
     driver.find_element_by_id('login').click()
     self._ExpectEvent(event_id, 'login start')
     self._ExpectEvent(event_id, 'login done')
     self.GetNextEvent(success_id)
 
   def testDomMutationEvents(self):
-    """Basic tests for Dom Mutation observers."""
+    """Basic tests for WaitForDomNode."""
+    url = self.GetHttpURLForDataPath('apptest', 'dom_mutations.html')
+    self.NavigateToURL(url)
+    self.WaitForDomNode(domselector.CSSSelector('#login'), 'Log In')
+    self.NewWebDriver().find_element_by_id('login').click()
+    self.WaitForDomNode(domselector.XPath('id(\'console\')'), '.*succeeded.*')
+
+  def testDomMutationObservers(self):
+    """Tests for the various types of Dom Mutation observers."""
     url = self.GetHttpURLForDataPath('apptest', 'dom_mutations.html')
     self.NavigateToURL(url)
     self.GetNextEvent(self.AddDomMutationObserver(
-        'add', domselector.XPath('/html/body')))
+        'exists', domselector.XPath('/html/body')))
     self.GetNextEvent(self.AddDomMutationObserver(
         'add', domselector.CSSSelector('#login'), expected_value='Log In'))
     success_id = self.AddDomMutationObserver(
         'change', domselector.XPath('id(\'console\')'),
         expected_value='.*succeeded.*')
     self.NewWebDriver().find_element_by_id('login').click()
     self.GetNextEvent(self.AddDomMutationObserver(
         'remove', domselector.XPath('id(\'fail\')/a')))
     self.GetNextEvent(success_id)
 
   def _ExpectEvent(self, event_id, expected_event_name):
     """Checks that the next event is expected."""
     e = self.GetNextEvent(event_id)
     self.assertEqual(e.get('name'), expected_event_name,
                      msg="unexpected event: %s" % e)
 
 
 if __name__ == '__main__':
   pyauto_functional.Main()