public void Verify_Destination_Currency_Properly_Calculated()
        {
            // Create mock currency service
            var stubbedCurrencyService = MockRepository.GenerateStub<ICurrencyService>();
            var rate = (decimal)0.5d;
            stubbedCurrencyService.Stub(s => s.GetExchangeRate("ABC", "MTG")).Return(rate);

            // Call controller action
            var controller = new CurrencyController(stubbedCurrencyService);
            var indexModel = new IndexModel { SourceCurrency = "ABC", DestinationCurrency = "MTG", SourceAmount = 15 };
            var result = (ContentResult)controller.Convert(indexModel);

            // Validate
            Assert.That(result.Content, Is.EqualTo((indexModel.SourceAmount * rate).ToString()));
        }