currencyWithJasmineTests.js

var converter = {
    usdExchangeRate: function(currencySymbol) {
        var rates = {
            'USD': 1,
            'GBP': 0.63
        }
        return rates[currencySymbol];
    },
    dollarsToPounds: function(usdAmount) {
        return usdAmount * this.usdExchangeRate('GBP');
    }
};

// converter.exchange(amount, from , to)

describe("Currency", function() {
    describe("usdExchangeRate", function() {
       it("should be 1 for 1 dollar", function() {
           var rate = converter.usdExchangeRate('USD');
           expect(rate).toBe(1);
       });
       // £: option key + 3 key on Mac OS X
       it("should be 1 for pounds", function() {
           var rate = converter.usdExchangeRate('GBP');
           expect(rate).toBe(0.63);
       });
   });

    describe("dollarsToPounds", function() {
         it("should convert 3.2USD to 2GBP", function() {
            expect(converter.dollarsToPounds(3.2)).toBeCloseTo(2.02, 2)
         });
     }); 
});