'Test change log level of existing filter.'

def test_set_filter(self):

    self.setup_logger(TEST_CONFIG)
    self.assert_not_logged('asdf', logging.DEBUG)
    self.assert_logged('dummy', logging.WARNING)
    self.hass.services.call(logger.DOMAIN, 'set_level', {'asdf': 'debug', 'dummy': 'info'})
    self.hass.block_till_done()
    self.assert_logged('asdf', logging.DEBUG)
    self.assert_logged('dummy', logging.WARNING)
