How to use the smartcar.const function in smartcar

client = smartcar.AuthClient(self.client_id, self.client_secret,
                self.redirect_uri, self.scope, development=False)

        actual = client.get_auth_url(force=True, state='stuff', single_select='potato')

        query = urlencode({
            'response_type': 'code',
            'client_id': self.client_id,
            'redirect_uri': self.redirect_uri,
            'approval_prompt': 'force',
            'state': 'stuff',
            'scope': ' '.join(self.scope),
            'single_select': False
        })

        expected = smartcar.const.CONNECT_URL + '/oauth/authorize?' + query

        expected_params = parse_qs(expected)
        actual_params = parse_qs(actual)

        assertDeepEquals(self, expected_params, actual_params)

def exchange_refresh_token(self, refresh_token):
        """ Exchange a refresh token for a new access dictionary

        Args:
            refresh_token (str): A valid refresh token from a previously retrieved
                access object

        Returns:
            dict: dict containing access and refresh token

        Raises:
            SmartcarException

        """
        method = 'POST'
        url = const.AUTH_URL
        data = {
            'grant_type': 'refresh_token',
            'refresh_token': refresh_token
        }
        response = requester.call(method, url, data=data, auth=self.auth).json()
        return set_expiration(response)