'Use of default_args kwarg can be used to nuke e.g. -v'

def test_overriding_default_args(self):

    r = self.rsync(2, default_opts='-pthrz')
    for x in rsync_sources:
        assert (not re.search(('^%s$' % x), r.stdout, re.M)), ("'%s'    was    found    in    '%s'" % (x, r.stdout))
