How to use the fpl.models.h2h_league.H2HLeague function in fpl

async def test_init(self, loop):
        session = aiohttp.ClientSession()
        league = H2HLeague(h2h_league_data, session)
        assert league._session == session
        for k, v in h2h_league_data.items():
            assert getattr(league, k) == v
        await session.close()

async def test_h2h_league(self, loop, fpl):
        await fpl.login()
        h2h_league = await fpl.get_h2h_league(902521)
        assert isinstance(h2h_league, H2HLeague)

        h2h_league = await fpl.get_h2h_league(902521, True)
        assert isinstance(h2h_league, dict)

:param return_json: (optional) Boolean. If ``True`` returns a ``dict``,
            if ``False`` returns a :class:`H2HLeague` object. Defaults to
            ``False``.
        :type return_json: bool
        :rtype: :class:`H2HLeague` or ``dict``
        """
        if not logged_in(self.session):
            raise Exception("User must be logged in.")

        url = API_URLS["league_h2h"].format(league_id)
        league = await fetch(self.session, url)

        if return_json:
            return league

        return H2HLeague(league, session=self.session)