Revert of [chromedriver] Remove invalid assertions from tests.

chrome/test/chromedriver/test/run_py_tests.py

 #!/usr/bin/env python
 # 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.
 
 """End to end tests for ChromeDriver."""
 
 import base64
 import json
 import math
@@ skipping 1201 matching lines @@
     self._driver.Load(self.GetHttpUrlForFile('/chromedriver/outer.html'))
     frame = self._driver.FindElement('tag name', 'iframe')
     self._driver.SwitchToFrame(frame)
     self._driver.Load(self.GetHttpUrlForFile('/chromedriver/inner.html'))
     self._driver.GoBack()
     p = self._driver.FindElement('tag name', 'p')
     self.assertEquals('Two', p.GetText())
 
   def testCanSwitchToPrintPreviewDialog(self):
     old_handles = self._driver.GetWindowHandles()
+    self.assertEquals(1, len(old_handles))
     self._driver.ExecuteScript('setTimeout(function(){window.print();}, 0);')
     new_window_handle = self.WaitForNewWindow(self._driver, old_handles)
     self.assertNotEqual(None, new_window_handle)
     self._driver.SwitchToWindow(new_window_handle)
     self.assertEquals('chrome://print/', self._driver.GetCurrentUrl())
 
   def testCanClickInIframes(self):
     self._driver.Load(self.GetHttpUrlForFile('/chromedriver/nested.html'))
     a = self._driver.FindElement('tag name', 'a')
     a.Click()
@@ skipping 411 matching lines @@
     crx = os.path.join(_TEST_DATA_DIR, 'ext_slow_loader.crx')
     driver = self.CreateDriver(
         chrome_switches=['user-agent=' + server.GetUrl()],
         chrome_extensions=[self._PackExtension(crx)])
     self.assertTrue(did_load_event.is_set())
 
   def testCanLaunchApp(self):
     app_path = os.path.join(_TEST_DATA_DIR, 'test_app')
     driver = self.CreateDriver(chrome_switches=['load-extension=%s' % app_path])
     old_handles = driver.GetWindowHandles()
+    self.assertEqual(1, len(old_handles))
     driver.LaunchApp('gegjcdcfeiojglhifpmibkadodekakpc')
-    new_window_handle = self.WaitForNewWindow(
-        driver, old_handles, check_closed_windows=False)
+    new_window_handle = self.WaitForNewWindow(driver, old_handles)
     driver.SwitchToWindow(new_window_handle)
     body_element = driver.FindElement('tag name', 'body')
     self.assertEqual('It works!', body_element.GetText())
 
   def testCanInspectBackgroundPage(self):
     app_path = os.path.join(_TEST_DATA_DIR, 'test_app')
     extension_path = os.path.join(_TEST_DATA_DIR, 'all_frames')
     driver = self.CreateDriver(
         chrome_switches=['load-extension=%s' % app_path],
         experimental_options={'windowTypes': ['background_page']})
@@ skipping 617 matching lines @@
 
   all_tests_suite = unittest.defaultTestLoader.loadTestsFromModule(
       sys.modules[__name__])
   tests = unittest_util.FilterTestSuite(all_tests_suite, options.filter)
   ChromeDriverTest.GlobalSetUp()
   MobileEmulationCapabilityTest.GlobalSetUp()
   result = unittest.TextTestRunner(stream=sys.stdout, verbosity=2).run(tests)
   ChromeDriverTest.GlobalTearDown()
   MobileEmulationCapabilityTest.GlobalTearDown()
   sys.exit(len(result.failures) + len(result.errors))