public void ConvertFromUSD_InvalidCurrencyISO_ReturnsMinusOne(string currency)
        {
            var quotes          = new CurrencyLayerQuotes(new Bash.Bash(), "api_key", 20, "chf", "usd", "czk");
            var convertedAmount = quotes.ConvertFromUSD(currency);

            Assert.True(convertedAmount.Result < 0);
        }
        public void GetConversionQuote_InvalidCurrencyISO_ReturnsMinusOne(string currency)
        {
            var quotes = new CurrencyLayerQuotes(new Bash.Bash(), "api_key", 20, "chf", "usd", "czk");
            var quote  = quotes.GetConversionQuote(currency).Result;

            Assert.True(quote < 0);
        }