    @Test
    public void parseBlockchainInfoResponse() throws JSONException {

        JSONObject in = new JSONObject(readStringFromFile("exchange_rate_blockchain_info_response.json"));
        JSONObject out = ExchangeRateUtil.getInstance().parseBlockchainInfoResponse(in);

        assertEquals(2, out.length());
        assertEquals(1E-8, out.getJSONObject("USD").getDouble("rate"));
    }