### Question:
BitpandaProExchange implements IExchangeAdvanced, IRateSourceAdvanced { @Override public BigDecimal getFiatBalance(String fiatCurrency) { return safely(() -> { assertValidFiat(fiatCurrency); return fetchBalance(fiatCurrency); }, "getFiatBalance", fiatCurrency); } BitpandaProExchange(URI baseUri, String apikey, String preferredFiatCurrency); static IRateSourceAdvanced asRateSource(String preferredFiatCurrency); static IExchangeAdvanced asExchange(String apikey, String preferredFiatCurrency); @Override Set<String> getCryptoCurrencies(); @Override Set<String> getFiatCurrencies(); @Override String getPreferredFiatCurrency(); @Override BigDecimal getExchangeRateLast(String cryptoCurrency, String fiatCurrency); @Override BigDecimal getExchangeRateForBuy(String cryptoCurrency, String fiatCurrency); @Override BigDecimal getExchangeRateForSell(String cryptoCurrency, String fiatCurrency); @Override BigDecimal calculateBuyPrice(String cryptoCurrency, String fiatCurrency, BigDecimal cryptoAmount); @Override BigDecimal calculateSellPrice(String cryptoCurrency, String fiatCurrency, BigDecimal cryptoAmount); @Override BigDecimal getCryptoBalance(String cryptoCurrency); @Override BigDecimal getFiatBalance(String fiatCurrency); @Override String getDepositAddress(String cryptoCurrency); @Override String sendCoins(String destinationAddress, BigDecimal amount, String cryptoCurrency, String description); @Override String purchaseCoins(BigDecimal amount, String cryptoCurrency, String fiatCurrencyToUse, String description); @Override String sellCoins(BigDecimal cryptoAmount, String cryptoCurrency, String fiatCurrencyToUse,
        String description); @Override ITask createPurchaseCoinsTask(BigDecimal amount, String cryptoCurrency, String fiatCurrencyToUse, String description); @Override ITask createSellCoinsTask(BigDecimal amount, String cryptoCurrency, String fiatCurrencyToUse, String description);  }### Answer:
@Test public void shouldFetchEuroBalance() { final BigDecimal balance = subject.getFiatBalance(EUR.getCode()); assertNotNull(balance); assertTrue("negative balance", balance.compareTo(BigDecimal.ZERO) >= 0); }