Propagate return code correctly from tests.

bin/cros_au_test_harness.py

 #!/usr/bin/python
 
 # Copyright (c) 2010 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.
 
 import optparse
 import os
 import sys
 import unittest
@@ skipping 106 matching lines @@
 
     RunCommand([
         '%s/image_to_live.sh' % self.crosutils,
         '--image=%s' % image_path,
         '--remote=%s' % remote,
         stateful_change_flag,
         '--verify',
         ], enter_chroot=False)
 
 
-  def NotVerifyImage(self):
+  def VerifyImage(self):
     """Verifies an image using run_remote_tests.sh with verification suite."""
     RunCommand([
         '%s/run_remote_tests.sh' % self.crosutils,
         '--remote=%s' % remote,
         _VERIFY_SUITE,
        ], error_ok=False, enter_chroot=False)
 
 
 class VirtualAUTest(unittest.TestCase, AUTest):
   """Test harness for updating virtual machines."""
@@ skipping 84 matching lines @@
 
   if not base_image_path:
     parser.error('Need path to base image for vm.')
 
   if not target_image_path:
     parser.error('Need path to target image to update with.')
 
   if not board:
     parser.error('Need board to convert base image to vm.')
 
+  return_code = 0
+
   # Only run the test harness we care about.
   if options.type == 'vm':
     suite = unittest.TestLoader().loadTestsFromTestCase(VirtualAUTest)
-    unittest.TextTestRunner(verbosity=2).run(suite)
+    return_code = unittest.TextTestRunner(verbosity=2).run(suite)
   elif options.type == 'real':
     if not options.remote:
       parser.error('Real tests require a remote test machine.')
     else:
       remote = options.remote
 
     suite = unittest.TestLoader().loadTestsFromTestCase(RealAUTest)
-    unittest.TextTestRunner(verbosity=2).run(suite)
+    return_code = unittest.TextTestRunner(verbosity=2).run(suite)
   else:
     parser.error('Could not parse harness type %s.' % options.type)
+
+  sys.exit(return_code)