Python unittest and reporting exit status back to Windows shell

I'm using the Python unittest implementation, and trying to get an exit status to "bubble-up" to the Windows shell. I basically want the basic functionality provided by unittest.main(), but Sikuli uses TextTestRunner and I cannot figure out how to get the

The commands I'm running are the following:

$ java -jar "c:\Program Files\Sikuli X\sikuli-script.jar" PrototypeRuns.sikuli
$ echo %ERRORLEVEL%

The ERRORLEVEL is always 0. I've tried adding a sys.exit() and passing in the number of errors, but this causes Sikuli to report "[error] Can't run this Sikuli script: PrototypeRuns.sikuli"

My code is very small/basic, and I think I'm just missing something because I'm a n00b:

from sikuli import *
import unittest

class UnitTestA(unittest.TestCase):

  def setUp(self):
    return None

  def tearDown(self):
    return None

  def testAlwaysFails(self):
    assert(False)

if __name__ == '__main__':
  suite = unittest.TestLoader().loadTestsFromTestCase(UnitTestA)
  runner = unittest.TextTestRunner(verbosity=2)
  result = runner.run(suite)

  # combines the number of errors and failures
  status = len(result.errors) + len(result.failures)
  sys.exit(status)

Any help is greatly appreciated! Thanks -Chris