How to use the flexmock.ExceptionClassError function in flexmock

def _handle_exception_matching(expectation):
      return_values = _getattr(expectation, 'return_values')
      if return_values:
        raised, instance = sys.exc_info()[:2]
        message = '%s' % instance
        expected = return_values[0].raises
        if not expected:
          raise
        args = return_values[0].value
        expected_instance = expected(*args['kargs'], **args['kwargs'])
        expected_message = '%s' % expected_instance
        if _isclass(expected):
          if expected is not raised and expected not in raised.__bases__:
            raise (ExceptionClassError('expected %s, raised %s' %
                   (expected, raised)))
          if args['kargs'] and type(RE_TYPE) is type(args['kargs'][0]):
            if not args['kargs'][0].search(message):
              raise (ExceptionMessageError('expected /%s/, raised "%s"' %
                     (args['kargs'][0].pattern, message)))
          elif expected_message and expected_message != message:
            raise (ExceptionMessageError('expected "%s", raised "%s"' %
                   (expected_message, message)))
        elif expected is not raised:
          raise (ExceptionClassError('expected "%s", raised "%s"' %
                 (expected, raised)))
      else:
        raise

args = return_values[0].value
        expected_instance = expected(*args['kargs'], **args['kwargs'])
        expected_message = '%s' % expected_instance
        if _isclass(expected):
          if expected is not raised and expected not in raised.__bases__:
            raise (ExceptionClassError('expected %s, raised %s' %
                   (expected, raised)))
          if args['kargs'] and type(RE_TYPE) is type(args['kargs'][0]):
            if not args['kargs'][0].search(message):
              raise (ExceptionMessageError('expected /%s/, raised "%s"' %
                     (args['kargs'][0].pattern, message)))
          elif expected_message and expected_message != message:
            raise (ExceptionMessageError('expected "%s", raised "%s"' %
                   (expected_message, message)))
        elif expected is not raised:
          raise (ExceptionClassError('expected "%s", raised "%s"' %
                 (expected, raised)))
      else:
        raise