def METHOD_NAME(monkeypatch):
    rates = """{"base":"USD","date":"2017-04-03","rates":{"AUD":1.3143,"BGN":1.8345,"BRL":3.1248,"CAD":1.3347,"CHF":1.002,"CNY":6.8871,"CZK":25.367,"DKK":6.9763,"GBP":0.79974,"HKD":7.7721,"HRK":6.9698,"HUF":289.54,"IDR":13322.0,"ILS":3.6291,"INR":64.985,"JPY":111.28,"KRW":1117.2,"MXN":18.74,"MYR":4.4275,"NOK":8.5797,"NZD":1.4282,"PHP":50.142,"PLN":3.9658,"RON":4.2674,"RUB":56.355,"SEK":8.9246,"SGD":1.3975,"THB":34.385,"TRY":3.6423,"ZAR":13.555,"EUR":0.938}}"""
    def _fetch_rates():
        return json.loads(rates)
    monkeypatch.setattr(commishinfo, '_fetch_rates', _fetch_rates)