### Question:
MultiCurrencyAmount implements FxConvertible<CurrencyAmount>, ImmutableBean, Serializable { public static MultiCurrencyAmount empty() { return EMPTY; } private  MultiCurrencyAmount(ImmutableSortedSet<CurrencyAmount> amounts); private  MultiCurrencyAmount(
      SortedSet<CurrencyAmount> amounts); static MultiCurrencyAmount empty(); static MultiCurrencyAmount of(Currency currency, double amount); static MultiCurrencyAmount of(CurrencyAmount... amounts); static MultiCurrencyAmount of(Iterable<CurrencyAmount> amounts); static MultiCurrencyAmount of(Map<Currency, Double> map); static MultiCurrencyAmount total(Iterable<CurrencyAmount> amounts); static Collector<CurrencyAmount, ?, MultiCurrencyAmount> toMultiCurrencyAmount(); ImmutableSet<Currency> getCurrencies(); int size(); boolean contains(Currency currency); CurrencyAmount getAmount(Currency currency); CurrencyAmount getAmountOrZero(Currency currency); MultiCurrencyAmount plus(Currency currency, double amountToAdd); MultiCurrencyAmount plus(CurrencyAmount amountToAdd); MultiCurrencyAmount plus(MultiCurrencyAmount amountToAdd); MultiCurrencyAmount minus(Currency currency, double amountToAdd); MultiCurrencyAmount minus(CurrencyAmount amountToSubtract); MultiCurrencyAmount minus(MultiCurrencyAmount amountToSubtract); MultiCurrencyAmount multipliedBy(double factor); MultiCurrencyAmount negated(); Stream<CurrencyAmount> stream(); MultiCurrencyAmount mapAmounts(DoubleUnaryOperator mapper); MultiCurrencyAmount mapCurrencyAmounts(UnaryOperator<CurrencyAmount> operator); @Override CurrencyAmount convertedTo(Currency resultCurrency, FxRateProvider rateProvider); ImmutableSortedMap<Currency, Double> toMap(); @Override String toString(); static MultiCurrencyAmount.Meta meta(); @Override MultiCurrencyAmount.Meta metaBean(); ImmutableSortedSet<CurrencyAmount> getAmounts(); @Override boolean equals(Object obj); @Override int hashCode();  }### Answer:
@Test public void test_empty() { assertMCA(MultiCurrencyAmount.empty()); }