@decorator
def dec(f, self, *a, **kw):
    failed_for = []
    fail = False
    for url in my_urls:
        try:
            log.debug("Running test with engine %s", url)
            try:
                try:
                    self._setup(url)
                except sa_exc.OperationalError:
                    log.info('Backend %s is not available, skip it' % url)
                    continue
                except Exception,e:
                    setup_exception=e
                else:
                    setup_exception=None
                    f(self, *a, **kw)
            finally:
                try:
                    self._teardown()
                except Exception,e:
                    teardown_exception=e
                else:
                    teardown_exception=None
            if setup_exception or teardown_exception:
                raise RuntimeError((
                    'Exception during _setup/_teardown:\n'
                    'setup: %r\n'
                    'teardown: %r\n'
                    )%(setup_exception,teardown_exception))
        except Exception,e:
            failed_for.append(url)
            fail = True
    for url in failed_for:
        log.error('Failed for %s', url)
    if fail:
        # cause the failure :-)
        raise
return dec