public CurrencyRatesService(ICurrencyRatesRetriver currencyRatesRetriver, ICurrencyRepository currencyRepository)
 {
     _currencyRatesRetriver = currencyRatesRetriver;
     _currencyRepository    = currencyRepository;
 }
 public CurrencyRatesRetreiverTests()
 {
     _currencyRatesRetriver = new CurrencyRatesRetriver();
 }