public void LoadBySystemName_ReturnExpectedValue()
{
var provider = new Mock <IExchangeRateProvider>();
provider.Setup(c => c.SystemName).Returns("sysname");
var exchangeRateService = new ExchangeRateService(new List <IExchangeRateProvider>()
{
provider.Object
}, _settings);
var result = exchangeRateService.LoadExchangeRateProviderBySystemName("sysname");
Assert.IsNotNull(result);
Assert.AreEqual(result.SystemName, "sysname");
}