def METHOD_NAME(mocker):
    # Because CryptoToFiatConverter is a Singleton we reset the listings
    listmock = MagicMock(side_effect=RequestException)
    mocker.patch.multiple(
        'freqtrade.rpc.fiat_convert.CoinGeckoAPI',
        get_coins_list=listmock,
    )
    # with pytest.raises(RequestEsxception):
    fiat_convert = CryptoToFiatConverter()
    fiat_convert._coinlistings = {}
    fiat_convert._load_cryptomap()
    assert len(fiat_convert._coinlistings) == 0