Simplify long tests to only test target image rather than back to base image.

au_test_harness/au_test.py

 # Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Module containing a test suite that is run to test auto updates."""
 
 import os
 import tempfile
 import time
 import unittest
@@ skipping 114 matching lines @@
     """Overrides unittest.TestCase.tearDown and called after every test."""
     self.worker.CleanUp()
 
   def testUpdateKeepStateful(self):
     """Tests if we can update normally.
 
     This test checks that we can update by updating the stateful partition
     rather than wiping it.
     """
     self.worker.InitializeResultsDirectory()
-    # Just make sure some tests pass on original image.  Some old images
-    # don't pass many tests.
     self.worker.PrepareBase(self.base_image_path)
-    # TODO(sosa): move to 100% once we start testing using the autotest paired
-    # with the dev channel.
-    percent_passed = self.worker.VerifyImage(self, 10)
 
-    # Update to - all tests should pass on new image.
+    # Update to
     self.worker.PerformUpdate(self.target_image_path, self.base_image_path)
-    percent_passed = self.worker.VerifyImage(self)
+    self.worker.VerifyImage(self)
 
-    # Update from - same percentage should pass that originally passed.
-    self.worker.PerformUpdate(self.base_image_path, self.target_image_path)
-    self.worker.VerifyImage(self, percent_passed)
+    # Update from
+    self.worker.PerformUpdate(self.target_image_path, self.target_image_path)
+    self.worker.VerifyImage(self)
 
   def testUpdateWipeStateful(self):
     """Tests if we can update after cleaning the stateful partition.
 
     This test checks that we can update successfully after wiping the
     stateful partition.
     """
     self.worker.InitializeResultsDirectory()
-    # Just make sure some tests pass on original image.  Some old images
-    # don't pass many tests.
     self.worker.PrepareBase(self.base_image_path)
-    percent_passed = self.worker.VerifyImage(self, 10)
 
-    # Update to - all tests should pass on new image.
+    # Update to
     self.worker.PerformUpdate(self.target_image_path, self.base_image_path,
                               'clean')
     self.worker.VerifyImage(self)
 
-    # Update from - same percentage should pass that originally passed.
-    self.worker.PerformUpdate(self.base_image_path, self.target_image_path,
+    # Update from
+    self.worker.PerformUpdate(self.target_image_path, self.target_image_path,
                               'clean')
-    self.worker.VerifyImage(self, percent_passed)
+    self.worker.VerifyImage(self)
 
   def testInterruptedUpdate(self):
     """Tests what happens if we interrupt payload delivery 3 times."""
 
     class InterruptionFilter(cros_test_proxy.Filter):
       """This filter causes the proxy to interrupt the download 3 times
 
          It does this by closing the first three connections to transfer
          2M total in the outbound connection after they transfer the
          2M.
@@ skipping 98 matching lines @@
     url = 'http://gsdview.appspot.com/chromeos-localmirror/' \
           'autest-images/corrupted_image.gz'
     payload = os.path.join(self.download_folder, 'corrupted.gz')
 
     # Read from the URL and write to the local file
     urllib.urlretrieve(url, payload)
 
     # This update is expected to fail...
     expected_msg = 'zlib inflate() error:-3'
     self.AttemptUpdateWithPayloadExpectedFailure(payload, expected_msg)