How to use

CurrencyConversionApi

in

com.ning.billing.currency.api

@Override
public String getProcessedPaymentRate() {
  final Currency currency = getProcessedCurrency();
  if (currency == null) {
    return null;
  }
  // If there were multiple payments (and refunds) we pick chose the last one
  DateTime latestPaymentDate = null;
  final Iterator<InvoicePayment> paymentIterator = ((DefaultInvoice) invoice).getPayments().iterator();
  while (paymentIterator.hasNext()) {
    final InvoicePayment cur = paymentIterator.next();
    latestPaymentDate = latestPaymentDate != null && latestPaymentDate.isAfter(cur.getPaymentDate()) ?
              latestPaymentDate : cur.getPaymentDate();
  }
  try {
    final CurrencyConversion conversion = currencyConversionApi.getCurrencyConversion(currency, latestPaymentDate);
    for (Rate rate : conversion.getRates()) {
      if (rate.getCurrency() == getCurrency()) {
        return rate.getValue().toString();
      }
    }
  } catch (CurrencyConversionException e) {
    logger.warn("Failed to retrieve currency conversion rates for currency = " + currency + " and date = " + latestPaymentDate, e);
    return null;
  }
  logger.warn("Failed to retrieve currency conversion rates for currency = " + currency + " and date = " + latestPaymentDate);
  return null;
}

Mockito.when(currencyConversion.getRates()).thenReturn(rates);
try {
  Mockito.when(currencyConversionApi.getCurrencyConversion(Mockito.<Currency>any(), Mockito.<DateTime>any())).thenReturn(currencyConversion);
} catch (CurrencyConversionException e) {
  throw new RuntimeException(e);