public void Get_currencies_converterlayer_success()
        {
            var mock = new Mock <IHttpClient>();

            mock.Setup(x => x.GetBaseHttpTask <Dictionary <string, string> >(Singleton.AppSettings.BaseUrl, "currency/currencies"));

            var service = new CurrencyConverterService(mock.Object);

            service.GetCurrencies();
            mock.Verify(x => x.GetBaseHttpTask <Dictionary <string, string> >(Singleton.AppSettings.BaseUrl, "currency/currencies"), Times.Once);
        }